Your Local Water Profile: Laguna Hills
This profile explains what the applicable water provider reported for Laguna Hills, what those results may mean throughout a home, and where property-specific testing or inspection may still be needed.
First, confirm your water provider.
Water service can vary by address. Confirm the provider shown on your water bill before applying provider-specific results.
What the official water report says
Your water at a glance
El Toro Water District
The report lists hardness as 270 ppm; this is very hard on the USGS scale.
Reported range: 235 - 305 ppm
USGS hardness scale: 0–60 soft; 61–120 moderately hard; 121–180 hard; >180 very hard, in mg/L as CaCO3.
Moulton Niguel Water District
The report lists hardness as 270 ppm; this is very hard on the USGS scale.
USGS hardness scale: 0–60 soft; 61–120 moderately hard; 121–180 hard; >180 very hard, in mg/L as CaCO3.
Irvine Ranch Water District
The report lists hardness as 295 ppm as CaCO3; this is not classified because the reported unit could not be normalized on the USGS scale.
USGS hardness scale: 0–60 soft; 61–120 moderately hard; 121–180 hard; >180 very hard, in mg/L as CaCO3.
El Toro Water District — compliance, as reported
The report states: “the water delivered to your home meets or exceeds the quality standards required by federal and state regulatory agencies.”
Violations or advisories, as reported: No violations were reported. The water delivered meets or exceeds the quality standards required by federal and state regulatory agencies.
Moulton Niguel Water District — compliance, as reported
The report states: “Moulton Niguel’s water is safe and continues to meet all state and federal water quality standards.”
Violations or advisories, as reported: No violations occurred. The report states: \"Moulton Niguel’s water is safe and continues to meet all state and federal water quality standards.\" There were zero detections for all 29 PFAS chemicals tested.
Irvine Ranch Water District — compliance, as reported
The report states: “In 2024, IRWD drinking water met or exceeded all state and federal standards. [p. 2]”
The Three C's — 1 of 3
Chemistry
What does this water tend to do in a home?
El Toro Water District
Alkalinity, total as CaCO3
The utility reported: 114 ppm
Reported range: 105 - 123
MWDSC · report p. PAGE 5 · official report
Hardness, total as CaCO3
The utility reported: 270 ppm
Reported range: 235 - 305
MWDSC · report p. PAGE 5 · official report
Sodium
The utility reported: 103 ppm
Reported range: 90 - 116
MWDSC · report p. PAGE 5 · official report
Chloride
The utility reported: 104 ppm
Reported range: 93 - 116
MWDSC · report p. PAGE 5 · official report
Sulfate
The utility reported: 224 ppm
Reported range: 196 - 253
MWDSC · report p. PAGE 5 · official report
Specific Conductance
The utility reported: 979 \u00b5mho/cm
Reported range: 888 - 1,070
MWDSC · report p. PAGE 5 · official report
Total Dissolved Solids
The utility reported: 621 ppm
Reported range: 556 - 686
MWDSC · report p. PAGE 5 · official report
Calcium
The utility reported: 68 ppm
Reported range: 58 - 78
MWDSC · report p. PAGE 5 · official report
Magnesium
The utility reported: 26 ppm
Reported range: 22 - 29
MWDSC · report p. PAGE 5 · official report
Color
The utility reported: 2 color units
Reported range: 1-2
MWDSC · report p. PAGE 5 · official report
Odor
The utility reported: 1 threshold odor number
Reported range: 1
MWDSC · report p. PAGE 5 · official report
Turbidity
The utility reported: 0.06 ntu
Reported range: ND - 0.22
ETWD Distribution · report p. PAGE 7 · official report
Alkalinity, total as CaCO3
The utility reported: 124 ppm
Reported range: 115 - 144
IRWD · report p. PAGE 6 · official report
Hardness, total as CaCO3
The utility reported: 295 ppm
Reported range: 281 - 313
IRWD · report p. PAGE 6 · official report
pH
The utility reported: 7.9 pH unit
Reported range: 7.4 - 8.6
IRWD · report p. PAGE 6 · official report
Sodium
The utility reported: 105 ppm
Reported range: 90.3 - 114
IRWD · report p. PAGE 6 · official report
Chloride
The utility reported: 112 ppm
Reported range: 98.4 - 119
IRWD · report p. PAGE 6 · official report
Sulfate
The utility reported: 237 ppm
Reported range: 228 - 243
IRWD · report p. PAGE 6 · official report
Specific Conductance
The utility reported: 1,065 \u00b5mho/cm
Reported range: 1,008 - 1,126
IRWD · report p. PAGE 6 · official report
Total Dissolved Solids
The utility reported: 642 ppm
Reported range: 588 - 712
IRWD · report p. PAGE 6 · official report
Calcium
The utility reported: 72.7 ppm
Reported range: 67.2 - 79.5
IRWD · report p. PAGE 6 · official report
Magnesium
The utility reported: 27.9 ppm
Reported range: 26.2 - 29.8
IRWD · report p. PAGE 6 · official report
Color
The utility reported: Not detected at the report's stated reporting limit color units
Reported range: ND - 8
IRWD · report p. PAGE 6 · official report
Odor
The utility reported: 2 threshold odor number
Reported range: ND - 4
IRWD · report p. PAGE 6 · official report
Moulton Niguel Water District
Hardness, total as CaCO3
The utility reported: 270 ppm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Hardness, total
The utility reported: 15.7 grains/gallon
Diemer Water Treatment Plant · report p. PAGE 11 · official report
pH
The utility reported: 8.2 pH units
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Alkalinity, total as CaCO3
The utility reported: 114 ppm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Total Dissolved Solids
The utility reported: 621 ppm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Sodium
The utility reported: 103 ppm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Chloride
The utility reported: 104 ppm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Sulfate
The utility reported: 224 ppm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Specific Conductance
The utility reported: 979 μmho/cm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Calcium
The utility reported: 68 ppm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Magnesium
The utility reported: 26 ppm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Color
The utility reported: 2 color units
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Odor
The utility reported: 1 threshold odor number
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Turbidity
The utility reported: 0.06 NTU
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Hardness, total as CaCO3
The utility reported: 295 ppm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Hardness as Grains per Gallon
The utility reported: 17.21 grains/gallon
Baker Water Treatment Plant · report p. PAGE 12 · official report
pH
The utility reported: 7.9 pH units
Baker Water Treatment Plant · report p. PAGE 12 · official report
Alkalinity, total as CaCO3
The utility reported: 124 ppm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Total Dissolved Solids
The utility reported: 642 ppm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Sodium
The utility reported: 105 ppm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Chloride
The utility reported: 112 ppm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Sulfate
The utility reported: 237 ppm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Specific Conductance
The utility reported: 1,065 μmho/cm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Calcium
The utility reported: 72.7 ppm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Magnesium
The utility reported: 27.9 ppm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Color
The utility reported: <3 color units
Baker Water Treatment Plant · report p. PAGE 12 · official report
Odor
The utility reported: 1.8 threshold odor number
Baker Water Treatment Plant · report p. PAGE 12 · official report
Turbidity
The utility reported: 0.04 NTU
Baker Water Treatment Plant · report p. PAGE 12 · official report
Irvine Ranch Water District
Hardness, total
The utility reported: 295 ppm as CaCO3
Unregulated contaminants · report p. 8 · official report
Hardness, total
The utility reported: 17.3 grains/gal
Unregulated contaminants · report p. 8 · official report
Alkalinity, total
The utility reported: 124 ppm as CaCO3
Unregulated contaminants · report p. 8 · official report
Total Dissolved Solids
The utility reported: 642 ppm
Secondary standards · report p. 8 · official report
Lead
The utility reported: <5 ppb
Lead and copper action levels at residential taps · report p. 7 · official report
Copper
The utility reported: 0.1908 ppm
Lead and copper action levels at residential taps · report p. 7 · official report
Chlorine residual
The utility reported: 1.9 ppm
Disinfection byproducts · report p. 7 · official report
Corrosivity (Aggressiveness)
The utility reported: 12.5
Unregulated contaminants · report p. 8 · official report
Corrosivity (Langlier Index)
The utility reported: 0.62
Unregulated contaminants · report p. 8 · official report
The Three C's — 2 of 3
Contaminants
What was reported, and what do the applicable standards mean?
Legal limit — maximum contaminant level (MCL)
The highest level legally allowed in public drinking water under the applicable rule. Do not use MCL as a generic label for goals, action levels, notification levels, or independent guidelines. It is different from a non-enforceable health goal.
California health goal — public health goal (PHG)
A non-enforceable health-protective target developed for standard-setting context. It is not the California legal limit.
Federal health goal — maximum contaminant level goal (MCLG)
A non-enforceable EPA public-health target used in setting standards. It is not the legal limit.
Legal disinfectant-residual limit — maximum residual disinfectant level (MRDL)
The highest level of a drinking-water disinfectant allowed under the applicable rule. It is not an MCL for a contaminant.
El Toro Water District — regulated contaminants reported as detected (20)
Gross Alpha Particle Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 5
Benchmark: 15 · Health goal (goal): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Gross Beta Particle Activity
The utility reported: 4 pCi/L
Reported range: ND - 5
Benchmark: 50 · Health goal (goal): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Decay of Natural and Man-made Deposits
Reported constituent · report p. PAGE 5 · official report
Uranium
The utility reported: 1 pCi/L
Reported range: ND - 3
Benchmark: 20 · Health goal (goal): 0.43 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Aluminum
The utility reported: Not detected at the report's stated reporting limit ppm
Reported range: ND - 0.11
Benchmark: 1 · Health goal (goal): 0.6 — not an enforceable limit
Violation per report: No
Typical source, per the report: Treatment Process Residue, Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Barium
The utility reported: 0.124 ppm
Reported range: 0.124
Benchmark: 1 · Health goal (goal): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Refinery Discharge, Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Bromate
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - 1.6
Benchmark: 10 · Health goal (goal): 0.1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of Drinking Water Ozonation
Reported constituent · report p. PAGE 5 · official report
Fluoride
The utility reported: 0.7 ppm
Reported range: 0.6 - 0.8
Benchmark: 2 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Water Additive for Dental Health
Reported constituent · report p. PAGE 5 · official report
Gross Alpha Particle Activity
The utility reported: 3.8 pCi/L
Reported range: 3.8
Benchmark: 15 · Health goal (goal): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Gross Beta Particle Activity
The utility reported: 4.6 pCi/L
Reported range: 4.6
Benchmark: 50 · Health goal (goal): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Decay of Natural and Man-made Deposits
Reported constituent · report p. PAGE 6 · official report
Uranium
The utility reported: 2.2 pCi/L
Reported range: 2.2
Benchmark: 20 · Health goal (goal): 0.43 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Arsenic
The utility reported: 2 ppb
Reported range: 2 - 2.27
Benchmark: 10 · Health goal (goal): 0.004 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Barium
The utility reported: 0.129 ppm
Reported range: 0.113 - 0.141
Benchmark: 1 · Health goal (goal): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Refinery Discharge, Erosion of Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Chlorine Dioxide
The utility reported: 98.5 ppb
Reported range: ND - 680
Benchmark: 800 · Health goal (goal): 800 — not an enforceable limit
Violation per report: No
Typical source, per the report: Drinking Water Disinfectant Added for Treatment
Reported constituent · report p. PAGE 6 · official report
Chlorite
The utility reported: Not detected at the report's stated reporting limit ppm
Reported range: ND - 0.09
Benchmark: 1.0 · Health goal (goal): 0.05 — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of Drinking Water Chlorination
Reported constituent · report p. PAGE 6 · official report
Fluoride
The utility reported: 0.35 ppm
Reported range: 0.31 - 0.38
Benchmark: 2.0 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits; Water Additive for Dental Health
Reported constituent · report p. PAGE 6 · official report
Total Trihalomethanes
The utility reported: 56 ppb
Reported range: 23 - 56
Benchmark: 80
Violation per report: No
Typical source, per the report: Byproducts of Chlorine Disinfection
Reported constituent · report p. PAGE 7 · official report
Haloacetic Acids
The utility reported: 20 ppb
Reported range: 6.0 - 33
Benchmark: 60
Violation per report: No
Typical source, per the report: Byproducts of Chlorine Disinfection
Reported constituent · report p. PAGE 7 · official report
Chlorine Residual
The utility reported: 1.68 ppm
Reported range: 0.3 - 3.78
Benchmark: 4 · Health goal (goal): 4 — not an enforceable limit
Violation per report: No
Typical source, per the report: Disinfectant Added for Treatment
Reported constituent · report p. PAGE 7 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND
Benchmark: 15 · Health goal (goal): 0.2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Corrosion of Household Plumbing
Reported constituent · report p. PAGE 7 · official report
Copper
The utility reported: 0.082 ppm
Reported range: 0.082
Benchmark: 1.3 · Health goal (goal): 0.3 — not an enforceable limit
Violation per report: No
Typical source, per the report: Corrosion of Household Plumbing
Reported constituent · report p. PAGE 7 · official report
El Toro Water District — unregulated monitoring and secondary (aesthetic) records (37)
Unregulated means monitored without an applicable enforceable legal limit (MCL) — it does not mean unimportant or illegal. Secondary records address aesthetic, cosmetic, or technical effects such as taste, odor, staining, or scale, and are not automatically primary health standards.
Aluminum
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - 110
Typical source, per the report: Treatment Process Residue, Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Chloride
The utility reported: 104 ppm
Reported range: 93 - 116
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Color
The utility reported: 2 color units
Reported range: 1-2
Typical source, per the report: Naturally-occurring Organic Materials
Reported constituent · report p. PAGE 5 · official report
Odor
The utility reported: 1 threshold odor number
Reported range: 1
Typical source, per the report: Naturally-occurring Organic Materials
Reported constituent · report p. PAGE 5 · official report
Specific Conductance
The utility reported: 979 \u00b5mho/cm
Reported range: 888 - 1,070
Typical source, per the report: Substances that Form Ions in Water
Reported constituent · report p. PAGE 5 · official report
Sulfate
The utility reported: 224 ppm
Reported range: 196 - 253
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Total Dissolved Solids
The utility reported: 621 ppm
Reported range: 556 - 686
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Alkalinity, total as CaCO3
The utility reported: 114 ppm
Reported range: 105 - 123
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Boron
The utility reported: 0.14 ppm
Reported range: 0.14
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Calcium
The utility reported: 68 ppm
Reported range: 58 - 78
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Hardness, total as CaCO3
The utility reported: 270 ppm
Reported range: 235 - 305
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Hardness, total
The utility reported: 16 grains/gal
Reported range: 14 - 18
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Magnesium
The utility reported: 26 ppm
Reported range: 22 - 29
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 5 · official report
pH
The utility reported: 8.2 units
Reported range: 8.2
Typical source, per the report: Hydrogen Ion Concentration
Reported constituent · report p. PAGE 5 · official report
Potassium
The utility reported: 4.9 ppm
Reported range: 4.4 - 5.4
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Sodium
The utility reported: 103 ppm
Reported range: 90 - 116
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Total Organic Carbon
The utility reported: 2.4 ppm
Reported range: 2 - 2.5
Typical source, per the report: Various Natural and Man-made Sources
Reported constituent · report p. PAGE 5 · official report
Lithium
The utility reported: 45 ppb
Reported range: 44 - 45
Reported constituent · report p. PAGE 5 · official report
Chloride
The utility reported: 112 ppm
Reported range: 98.4 - 119
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Color
The utility reported: Not detected at the report's stated reporting limit color units
Reported range: ND - 8
Typical source, per the report: Naturally-occurring Organic Materials
Reported constituent · report p. PAGE 6 · official report
Manganese
The utility reported: 1.44 ppb
Reported range: ND - 47
Typical source, per the report: Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Odor
The utility reported: 2 threshold odor number
Reported range: ND - 4
Typical source, per the report: Naturally-occurring Organic Materials
Reported constituent · report p. PAGE 6 · official report
Specific Conductance
The utility reported: 1,065 \u00b5mho/cm
Reported range: 1,008 - 1,126
Typical source, per the report: Substances that Form Ions in Water
Reported constituent · report p. PAGE 6 · official report
Sulfate
The utility reported: 237 ppm
Reported range: 228 - 243
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Total Dissolved Solids
The utility reported: 642 ppm
Reported range: 588 - 712
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Turbidity
The utility reported: Not detected at the report's stated reporting limit ntu
Reported range: ND - 0.3
Typical source, per the report: Soil Runoff
Reported constituent · report p. PAGE 6 · official report
Alkalinity, total as CaCO3
The utility reported: 124 ppm
Reported range: 115 - 144
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Boron
The utility reported: 0.138 ppm
Reported range: 0.127 - 0.153
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Calcium
The utility reported: 72.7 ppm
Reported range: 67.2 - 79.5
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Hardness, total as CaCO3
The utility reported: 295 ppm
Reported range: 281 - 313
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Hardness, total
The utility reported: 17 grains per gallon
Reported range: 16 - 18
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Magnesium
The utility reported: 27.9 ppm
Reported range: 26.2 - 29.8
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
pH
The utility reported: 7.9 pH unit
Reported range: 7.4 - 8.6
Typical source, per the report: Hydrogen Ion Concentration
Reported constituent · report p. PAGE 6 · official report
Potassium
The utility reported: 5.9 ppm
Reported range: 4.83 - 21.2
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Sodium
The utility reported: 105 ppm
Reported range: 90.3 - 114
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Total Organic Carbon
The utility reported: 1.9 ppm
Reported range: 1.9
Typical source, per the report: Various Natural and Man-made Sources
Reported constituent · report p. PAGE 6 · official report
Turbidity
The utility reported: 0.06 ntu
Reported range: ND - 0.22
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 7 · official report
Moulton Niguel Water District — regulated contaminants reported as detected (21)
Gross Alpha Particle Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 5
Benchmark: 15 · Health goal (goal): (0) — not an enforceable limit
Violation per report: No
Typical source, per the report: Runoff leaching of natural deposits
Reported constituent · report p. PAGE 11 · official report
Gross Beta Particle Activity
The utility reported: 4 pCi/L
Reported range: ND - 5
Benchmark: 50 · Health goal (goal): (0) — not an enforceable limit
Violation per report: No
Typical source, per the report: Decay of natural and man-made deposits
Reported constituent · report p. PAGE 11 · official report
Uranium
The utility reported: 1 pCi/L
Reported range: ND - 3
Benchmark: 20 · Health goal (goal): 0.43 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. PAGE 11 · official report
Aluminum
The utility reported: Not detected at the report's stated reporting limit ppm
Reported range: ND - 0.11
Benchmark: 1 · Health goal (goal): 0.6 — not an enforceable limit
Violation per report: No
Typical source, per the report: Treatment Process Residue, Natural Deposits
Reported constituent · report p. PAGE 11 · official report
Barium
The utility reported: 0.12 ppm
Reported range: 0.12
Benchmark: 1 · Health goal (goal): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Runoff and leaching from fertilizer use, septic tanks and sewage; natural deposits erosion
Reported constituent · report p. PAGE 11 · official report
Fluoride
The utility reported: 0.7 ppm
Reported range: 0.6 - 0.8
Benchmark: 2 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Water Additive for Dental Health. Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 11 · official report
Bromate
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - 1.6
Benchmark: 10 · Health goal (goal): 0.1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of drinking water ozonation
Reported constituent · report p. PAGE 11 · official report
Total Organic Carbon
The utility reported: 2.4 ppm
Reported range: 2.0 - 2.5
Benchmark: TT
Violation per report: No
Typical source, per the report: Various Natural and Man-made Sources. TOC is a precursor for the formation of disinfection byproducts
Reported constituent · report p. PAGE 11 · official report
Total Trihalomethanes
The utility reported: 52 ppb
Reported range: 23.5 - 49.6
Benchmark: 80
Reported constituent · report p. PAGE 11 · official report
Haloacetic Acids
The utility reported: 24 ppb
Reported range: 6.4 - 32.7
Benchmark: 60
Reported constituent · report p. PAGE 11 · official report
Disinfectant Residual (chloramines)
The utility reported: 2.17 mg/L
Reported range: 0.8 - 3.0
Benchmark: 4
Reported constituent · report p. PAGE 11 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
Benchmark: 15
Reported constituent · report p. PAGE 11 · official report
Copper
The utility reported: 0.103 mg/L
Benchmark: 1.3
Reported constituent · report p. PAGE 11 · official report
Gross Alpha Particle Activity
The utility reported: 3.8 pCi/L
Reported range: 3.8
Benchmark: 15 · Health goal (goal): (0) — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. PAGE 12 · official report
Gross Beta Particle Activity
The utility reported: 4.6 pCi/L
Reported range: 4.6
Benchmark: 50 · Health goal (goal): (0) — not an enforceable limit
Violation per report: No
Typical source, per the report: Decay of natural and man-made deposits
Reported constituent · report p. PAGE 12 · official report
Uranium
The utility reported: 2.2 pCi/L
Reported range: 2.2
Benchmark: 20 · Health goal (goal): 0.43 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. PAGE 12 · official report
Arsenic
The utility reported: 1.9 ppb
Reported range: 1.54 - 2.27
Benchmark: 10 · Health goal (goal): 0.004 — not an enforceable limit
Violation per report: No
Typical source, per the report: Treatment Process Residue, Natural Deposits
Reported constituent · report p. PAGE 12 · official report
Barium
The utility reported: 0.129 ppm
Reported range: 0.11 - 0.14
Benchmark: 1 · Health goal (goal): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Oil and metal refineries discharge; Natural deposits erosion
Reported constituent · report p. PAGE 12 · official report
Fluoride
The utility reported: 0.35 ppm
Reported range: 0.31 - 0.38
Benchmark: 2 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; water additive that promotes strong teeth
Reported constituent · report p. PAGE 12 · official report
Chlorite
The utility reported: Not detected at the report's stated reporting limit ppm
Reported range: ND - 0.09
Benchmark: 1 · Health goal (goal): 0.05 — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of drinking water chlorination
Reported constituent · report p. PAGE 12 · official report
Chlorine Dioxide
The utility reported: 98.5 ppb
Reported range: ND - 680
Benchmark: MRDL = 800 · Health goal (goal): MRDLG = 800 — not an enforceable limit
Violation per report: No
Typical source, per the report: Drinking water disinfectant added for treatment
Reported constituent · report p. PAGE 12 · official report
Moulton Niguel Water District — unregulated monitoring and secondary (aesthetic) records (40)
Unregulated means monitored without an applicable enforceable legal limit (MCL) — it does not mean unimportant or illegal. Secondary records address aesthetic, cosmetic, or technical effects such as taste, odor, staining, or scale, and are not automatically primary health standards.
Aluminum
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - 110
Typical source, per the report: Treatment Process Residue, Natural Deposits
Reported constituent · report p. PAGE 11 · official report
Chloride
The utility reported: 104 ppm
Reported range: 93 - 116
Typical source, per the report: Runoff or Leaching from Natural Deposits; seawater influence
Reported constituent · report p. PAGE 11 · official report
Color
The utility reported: 2 color units
Reported range: 1-2
Typical source, per the report: Naturally-occurring Organic Materials
Reported constituent · report p. PAGE 11 · official report
Odor
The utility reported: 1 threshold odor number
Reported range: 1
Typical source, per the report: Naturally-occurring Organic Materials
Reported constituent · report p. PAGE 11 · official report
Specific Conductance
The utility reported: 979 μmho/cm
Reported range: 888 - 1,070
Typical source, per the report: Substances that form ions in Water; seawater influence
Reported constituent · report p. PAGE 11 · official report
Sulfate
The utility reported: 224 ppm
Reported range: 196 - 253
Typical source, per the report: Runoff or Leaching from Natural Deposits; industrial wastes
Reported constituent · report p. PAGE 11 · official report
Total Dissolved Solids
The utility reported: 621 ppm
Reported range: 556 - 686
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 11 · official report
Chlorate
The utility reported: 77 ppb
Reported range: 77
Typical source, per the report: Byproduct of drinking water chlorination; industrial process
Reported constituent · report p. PAGE 11 · official report
Boron
The utility reported: 0.14 ppm
Reported range: 0.14
Typical source, per the report: Runoff or Leaching from Natural Deposits; industrial wastes
Reported constituent · report p. PAGE 11 · official report
Hardness, total as CaCO3
The utility reported: 270 ppm
Reported range: 235 - 305
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 11 · official report
Hardness, total
The utility reported: 15.7 grains/gallon
Reported range: 13.7 - 17.8
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 11 · official report
Magnesium
The utility reported: 26 ppm
Reported range: 22 - 29
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 11 · official report
pH
The utility reported: 8.2 pH units
Reported range: 8.2
Typical source, per the report: Hydrogen Ion Concentration
Reported constituent · report p. PAGE 11 · official report
Potassium
The utility reported: 4.9 ppm
Reported range: 4.4 - 5.4
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 11 · official report
N-Nitrosodi-n-butylamine
The utility reported: 2.5 ppt
Reported range: 2.5
Typical source, per the report: Byproduct of drinking water chloramination; industrial processes
Reported constituent · report p. PAGE 11 · official report
Sodium
The utility reported: 103 ppm
Reported range: 90 - 116
Typical source, per the report: Salt present in water; naturally-occurring
Reported constituent · report p. PAGE 11 · official report
Alkalinity, total as CaCO3
The utility reported: 114 ppm
Reported range: 105 - 123
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 11 · official report
Calcium
The utility reported: 68 ppm
Reported range: 58 - 78
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 11 · official report
Chloride
The utility reported: 112 ppm
Reported range: 98.4 - 119
Typical source, per the report: Runoff or Leaching from Natural Deposits; sea water influence
Reported constituent · report p. PAGE 12 · official report
Color
The utility reported: <3 color units
Reported range: <3 - 8
Typical source, per the report: Naturally-occurring Organic Materials
Reported constituent · report p. PAGE 12 · official report
Manganese
The utility reported: 1.44 ppb
Reported range: ND - 47
Typical source, per the report: Leaching from natural deposits
Reported constituent · report p. PAGE 12 · official report
Odor
The utility reported: 1.8 threshold odor number
Reported range: <1 - 4
Typical source, per the report: Naturally-occurring Organic Materials
Reported constituent · report p. PAGE 12 · official report
Specific Conductance
The utility reported: 1,065 μmho/cm
Reported range: 1008 - 1126
Typical source, per the report: Substances that form ions in Water; sea water influence
Reported constituent · report p. PAGE 12 · official report
Sulfate
The utility reported: 237 ppm
Reported range: 228 - 243
Typical source, per the report: Runoff or Leaching from Natural Deposits; industrial wastes
Reported constituent · report p. PAGE 12 · official report
Total Dissolved Solids
The utility reported: 642 ppm
Reported range: 588 - 712
Typical source, per the report: Runoff or Leaching from Natural Deposits; sea water influence
Reported constituent · report p. PAGE 12 · official report
Alkalinity, total as CaCO3
The utility reported: 124 ppm
Reported range: 115 - 144
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 12 · official report
Bicarbonate
The utility reported: 124 ppb
Reported range: 115 - 144
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 12 · official report
Boron
The utility reported: 0.13 ppm
Reported range: 0.12 - 0.15
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 12 · official report
Carbonate
The utility reported: <0.6 ppm
Reported range: <0.6 - 0.87
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 12 · official report
Calcium
The utility reported: 72.7 ppm
Reported range: 67.2 - 79.5
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 12 · official report
Hardness, total as CaCO3
The utility reported: 295 ppm
Reported range: 281 - 313
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 12 · official report
Hardness as Grains per Gallon
The utility reported: 17.21 grains/gallon
Reported range: 16.39 - 18.26
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 12 · official report
Magnesium
The utility reported: 27.9 ppm
Reported range: 26.2 - 29.8
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 12 · official report
Molybdenum
The utility reported: 5.4 ppb
Reported range: 4.83 - 5.74
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 12 · official report
pH
The utility reported: 7.9 pH units
Reported range: 7.4 - 8.6
Typical source, per the report: Hydrogen Ion Concentration
Reported constituent · report p. PAGE 12 · official report
Potassium
The utility reported: 5.96 ppm
Reported range: 4.83 - 21.2
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 12 · official report
Sodium
The utility reported: 105 ppm
Reported range: 90.3 - 114
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 12 · official report
Vanadium
The utility reported: 2.4 ppb
Reported range: 2.08 - 2.73
Typical source, per the report: Naturally occurring; industrial waste discharge
Reported constituent · report p. PAGE 12 · official report
Total Organic Carbon
The utility reported: 1.9 ppm
Reported range: 1.9
Typical source, per the report: Various natural and man-made sources
Reported constituent · report p. PAGE 12 · official report
Lithium
The utility reported: 33.8 ppb
Reported range: 9.4 - 43.0
Reported constituent · report p. PAGE 13 · official report
Irvine Ranch Water District — regulated contaminants reported as detected (22)
Total Trihalomethanes
The utility reported: 24.1 ppb
Reported range: 9.1 - 44.2
Legal limit (MCL): 80
Violation per report: No
Typical source, per the report: Byproducts of chlorine disinfection
Disinfection byproducts · report p. 7 · official report
Haloacetic Acids (five)
The utility reported: 10.0 ppb
Reported range: 4.1 - 19.6
Legal limit (MCL): 60
Violation per report: No
Typical source, per the report: Byproducts of chlorine disinfection
Disinfection byproducts · report p. 7 · official report
Chlorine residual
The utility reported: 1.9 ppm
Reported range: ND - 3.9
MRDL: 4.0 · Health goal (MRDLG): 4 — not an enforceable limit
Violation per report: No
Typical source, per the report: Disinfectant added for treatment
Disinfection byproducts · report p. 7 · official report
Color
The utility reported: <3 color units
Reported range: ND - 4
Legal limit (MCL): 15
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Aesthetic quality · report p. 7 · official report
Turbidity
The utility reported: 0.1 NTU
Reported range: ND - 6.9
Legal limit (MCL): 5
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Aesthetic quality · report p. 7 · official report
Odor
The utility reported: <1 threshold odor number
Reported range: ND - 4
Legal limit (MCL): 3
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Aesthetic quality · report p. 7 · official report
Fluoride
The utility reported: 0.54 mg/L
Reported range: 0.18 - 0.80
Legal limit (MCL): 2 · Health goal (MCLG): 0.8 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits, water treatment
Other · report p. 7 · official report
Copper
The utility reported: 0.1908 ppm
AL: 1.3 · Health goal (PHG): 0.3 — not an enforceable limit
Violation per report: No
Typical source, per the report: Corrosion of household plumbing
Lead and copper action levels at residential taps · report p. 7 · official report
Lead
The utility reported: <5 ppb
AL: 15 · Health goal (PHG): 0.2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Corrosion of household plumbing
Lead and copper action levels at residential taps · report p. 7 · official report
Alpha Radiation
The utility reported: 1.9 pCi/L
Reported range: ND - 3.8
Legal limit (MCL): 15 · Health goal (PHG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Radiologicals · report p. 8 · official report
Beta Radiation
The utility reported: 4.6 pCi/L
Reported range: ND - 5.0
Legal limit (MCL): 50 · Health goal (PHG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Decay of natural and man-made deposits
Radiologicals · report p. 8 · official report
Uranium
The utility reported: 2.2 pCi/L
Reported range: ND - 3.0
Legal limit (MCL): 20 · Health goal (PHG): 0.43 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Radiologicals · report p. 8 · official report
Aluminum
The utility reported: 0.105 ppm
Reported range: ND - 0.110
Legal limit (MCL): 1 · Health goal (PHG): 0.6 — not an enforceable limit
Violation per report: No
Typical source, per the report: Treatment process residue, natural deposits
Inorganic chemicals · report p. 8 · official report
Arsenic
The utility reported: 2.00 ppb
Reported range: ND - 3.04
Legal limit (MCL): 10 · Health goal (PHG): 0.004 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Inorganic chemicals · report p. 8 · official report
Barium
The utility reported: 0.124 ppm
Reported range: ND - 0.134
Legal limit (MCL): 1 · Health goal (PHG): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Inorganic chemicals · report p. 8 · official report
Bromate
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - 1.6
Legal limit (MCL): 10 · Health goal (PHG): 0.1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of drinking water ozonation
Inorganic chemicals · report p. 8 · official report
Chlorine
The utility reported: 2.5 ppm
Reported range: 1.5 - 3.9
Legal limit (MCL): 4.0 · Health goal (PHG): 4.0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Drinking water disinfectant added for treatment
Inorganic chemicals · report p. 8 · official report
Hexavalent Chromium
The utility reported: 0.1 ppb
Reported range: ND - 0.19
Legal limit (MCL): 10 · Health goal (PHG): 0.02 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; industrial discharge
Inorganic chemicals · report p. 8 · official report
Fluoride naturally-occurring
The utility reported: 0.35 ppm
Reported range: ND - 0.83
Legal limit (MCL): 2 · Health goal (PHG): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; IRWD does not add Fluoride to its local treated groundwater and surface water
Inorganic chemicals · report p. 8 · official report
Fluoride treatment-related
The utility reported: 0.7 ppm
Reported range: 0.6 - 0.8
Control range: 0.6 - 1.2 · Health goal (Optimal level): 0.7 — not an enforceable limit
Violation per report: No
Typical source, per the report: Water additive for dental health
Inorganic chemicals · report p. 8 · official report
Nitrate
The utility reported: 2.3 ppm as N
Reported range: ND - 4.3
Legal limit (MCL): 10 · Health goal (PHG): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Fertilizers, septic tanks
Inorganic chemicals · report p. 8 · official report
Nitrate+Nitrite
The utility reported: 2.3 ppm as N
Reported range: ND - 4.3
Legal limit (MCL): 10 · Health goal (PHG): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Fertilizers, septic tanks
Inorganic chemicals · report p. 8 · official report
Irvine Ranch Water District — unregulated monitoring and secondary (aesthetic) records (30)
Unregulated means monitored without an applicable enforceable legal limit (MCL) — it does not mean unimportant or illegal. Secondary records address aesthetic, cosmetic, or technical effects such as taste, odor, staining, or scale, and are not automatically primary health standards.
Germanium, total
The utility reported: 0.82 ppb
Reported range: ND - 1.1
Unregulated chemicals requiring monitoring in the distribution system · report p. 7 · official report
Manganese, total
The utility reported: 1.6 ppb
Reported range: 0.8 - 2.2
Unregulated chemicals requiring monitoring in the distribution system · report p. 7 · official report
Aluminum
The utility reported: 8.4 ppb
Reported range: ND - 110
Typical source, per the report: Treatment process residue, natural deposits
Secondary standards · report p. 8 · official report
Chloride
The utility reported: 112 ppm
Reported range: 17.8 - 124
Typical source, per the report: Leaching from natural deposits; seawater influence
Secondary standards · report p. 8 · official report
Color
The utility reported: <3 color units
Reported range: ND - 8
Typical source, per the report: Naturally-occurring organic substances
Secondary standards · report p. 8 · official report
Odor
The utility reported: 2 TON
Reported range: ND - 6
Typical source, per the report: Naturally-occurring organic materials
Secondary standards · report p. 8 · official report
Specific Conductance
The utility reported: 1065 µmho/cm
Reported range: 358 - 1126
Typical source, per the report: Ions in water; seawater influence
Secondary standards · report p. 8 · official report
Sulfate
The utility reported: 237 ppm
Reported range: 21.5 - 253
Typical source, per the report: Runoff or leaching from natural deposits
Secondary standards · report p. 8 · official report
Total Dissolved Solids
The utility reported: 642 ppm
Reported range: 134 - 738
Typical source, per the report: Runoff or leaching from natural deposits
Secondary standards · report p. 8 · official report
Turbidity
The utility reported: <0.10 NTU
Reported range: ND - 0.4
Typical source, per the report: Erosion of natural deposits
Secondary standards · report p. 8 · official report
Alkalinity, total
The utility reported: 124 ppm as CaCO3
Reported range: 70 - 233
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
Bicarbonate
The utility reported: 124 ppm as HCO3
Reported range: 70 - 144
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
Boron
The utility reported: 0.16 ppm
Reported range: ND - 0.25
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
Bromide
The utility reported: 0.14 ppm
Reported range: 0.02 - 0.29
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
Calcium
The utility reported: 72.7 ppm
Reported range: 16.7 - 79.5
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
Carbonate
The utility reported: <0.6 ppm
Reported range: <0.6 - 1.1
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
Chlorate
The utility reported: 77.0 ppb
Reported range: 77.0
Typical source, per the report: Byproduct of drinking water chlorination
Unregulated contaminants · report p. 8 · official report
Corrosivity (Aggressiveness)
The utility reported: 12.5
Reported range: 11.0 - 12.9
Typical source, per the report: Elemental balance in water
Unregulated contaminants · report p. 8 · official report
Corrosivity (Langlier Index)
The utility reported: 0.62
Reported range: (-)0.72 - 0.81
Typical source, per the report: Elemental balance in water
Unregulated contaminants · report p. 8 · official report
Hardness, total
The utility reported: 295 ppm as CaCO3
Reported range: 53.9 - 321
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
Hardness, total
The utility reported: 17.3 grains/gal
Reported range: 7.5 - 17.3
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
Magnesium
The utility reported: 27.9 ppm
Reported range: 2.9 - 29.8
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
Molybdenum
The utility reported: 7.9 ppb
Reported range: ND - 19.1
Typical source, per the report: Drinking water treatment chemical for aesthetic quality
Unregulated contaminants · report p. 8 · official report
N-Nitrosodi-n-butylamine (NDBA)
The utility reported: 2.5 ppt
Reported range: 2.5
Typical source, per the report: Byproducts of drinking water chloramination; industrial processes
Unregulated contaminants · report p. 8 · official report
Perfluorooctanoic acid (PFOA)
The utility reported: 1.5 ppt
Reported range: ND - 2.4
Typical source, per the report: used in fire-retarding foams and various industrial processes
Unregulated contaminants · report p. 8 · official report
pH
The utility reported: 8.3 pH units
Reported range: 7.1 - 8.6
Typical source, per the report: Acidity, hydrogen ions
Unregulated contaminants · report p. 8 · official report
Potassium
The utility reported: 5.9 ppm
Reported range: 0.65 - 21.2
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
Sodium
The utility reported: 105 ppm
Reported range: 25.1 - 116
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
Total Organic Carbon
The utility reported: 1.9 ppm
Reported range: 0.37 - 2.5
Typical source, per the report: Various natural and man-made sources
Unregulated contaminants · report p. 8 · official report
Vanadium
The utility reported: 4.0 ppb
Reported range: ND - 6.3
Typical source, per the report: Runoff or leaching from natural deposits
Unregulated contaminants · report p. 8 · official report
The Three C's — 3 of 3
Corrosion
What conditions could influence pipes, fixtures, and a water heater?
El Toro Water District
Alkalinity, total as CaCO3
The utility reported: 114 ppm
Reported range: 105 - 123
MWDSC · report p. PAGE 5 · official report
Chloride
The utility reported: 104 ppm
Reported range: 93 - 116
MWDSC · report p. PAGE 5 · official report
Sulfate
The utility reported: 224 ppm
Reported range: 196 - 253
MWDSC · report p. PAGE 5 · official report
Alkalinity, total as CaCO3
The utility reported: 124 ppm
Reported range: 115 - 144
IRWD · report p. PAGE 6 · official report
pH
The utility reported: 7.9 pH unit
Reported range: 7.4 - 8.6
IRWD · report p. PAGE 6 · official report
Chloride
The utility reported: 112 ppm
Reported range: 98.4 - 119
IRWD · report p. PAGE 6 · official report
Sulfate
The utility reported: 237 ppm
Reported range: 228 - 243
IRWD · report p. PAGE 6 · official report
Gross Alpha Particle Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 5
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Gross Alpha Particle Activity
The utility reported: 3.8 pCi/L
Reported range: 3.8
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND
Typical source, per the report: Corrosion of Household Plumbing
Reported constituent · report p. PAGE 7 · official report
Copper
The utility reported: 0.082 ppm
Reported range: 0.082
Typical source, per the report: Corrosion of Household Plumbing
Reported constituent · report p. PAGE 7 · official report
Moulton Niguel Water District
pH
The utility reported: 8.2 pH units
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Alkalinity, total as CaCO3
The utility reported: 114 ppm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Chloride
The utility reported: 104 ppm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
Sulfate
The utility reported: 224 ppm
Diemer Water Treatment Plant · report p. PAGE 11 · official report
pH
The utility reported: 7.9 pH units
Baker Water Treatment Plant · report p. PAGE 12 · official report
Alkalinity, total as CaCO3
The utility reported: 124 ppm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Chloride
The utility reported: 112 ppm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Sulfate
The utility reported: 237 ppm
Baker Water Treatment Plant · report p. PAGE 12 · official report
Gross Alpha Particle Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 5
Typical source, per the report: Runoff leaching of natural deposits
Reported constituent · report p. PAGE 11 · official report
Disinfectant Residual (chloramines)
The utility reported: 2.17 mg/L
Reported range: 0.8 - 3.0
Reported constituent · report p. PAGE 11 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
Reported constituent · report p. PAGE 11 · official report
Gross Alpha Particle Activity
The utility reported: 3.8 pCi/L
Reported range: 3.8
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. PAGE 12 · official report
Irvine Ranch Water District
Alkalinity, total
The utility reported: 124 ppm as CaCO3
Unregulated contaminants · report p. 8 · official report
Lead
The utility reported: <5 ppb
Lead and copper action levels at residential taps · report p. 7 · official report
Copper
The utility reported: 0.1908 ppm
Lead and copper action levels at residential taps · report p. 7 · official report
Alpha Radiation
The utility reported: 1.9 pCi/L
Reported range: ND - 3.8
Typical source, per the report: Erosion of natural deposits
Radiologicals · report p. 8 · official report
Whole-Home Relevance
What this may mean throughout your home
Local conditions can be relevant to equipment and fixtures — actual effects depend on your property.
Water heater (tank and tankless)
- What the local report can tell us
- The report's hardness and mineral values above are the system-level inputs most relevant to scale and sediment where water is heated.
- What a homeowner may notice
- Hardness minerals can contribute to scale on heating surfaces, sediment in tanks, and more frequent flushing or descaling needs.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Dishwasher and washing machine
- What the local report can tell us
- Reported hardness and secondary (aesthetic) records are the relevant system-level context for spotting and residue.
- What a homeowner may notice
- Hard water can change soap behavior and may contribute to spotting on dishes and residue in laundry.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Pipes, fixtures, faucets, and supply lines
- What the local report can tell us
- The corrosion-related inputs above (such as pH) describe the water entering the property — not the condition of any specific plumbing.
- What a homeowner may notice
- Mineral deposits can appear on aerators and fixtures; corrosion outcomes depend on materials, age, and water conditions together.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Drinking and cooking water
- What the local report can tell us
- The contaminant records above show what the utility reported for the system and period, with each benchmark type labeled.
- What a homeowner may notice
- Taste, odor, or aesthetic preferences can be noticeable even when health-based standards are met.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Decision Pathways
Treatment pathways to evaluate
Treatment is a decision pathway, not a product conclusion — no equipment can be responsibly chosen from city-level data alone.
The evaluation sequence we follow, in order:
- 1Define the concern
- 2Verify utility-level and home-specific evidence
- 3Choose point of treatment
- 4Verify the exact certified reduction claim for the exact model
- 5Review tradeoffs and maintenance
Water filtration
- Objective it can address
- Specific substances or aesthetic conditions (taste, odor, chlorine character).
- Point of treatment
- Point of entry or point of use, depending on the objective.
- Limitations to verify
- A filter works only for the conditions and reduction claims its exact design and certification support — filtration does not soften water.
Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.
Water softening
- Objective it can address
- Hardness minerals (calcium and magnesium) and the scale they can contribute to.
- Point of treatment
- Typically point of entry, confirmed by evaluation.
- Limitations to verify
- Softening primarily exchanges hardness minerals — it is not a universal contaminant-removal device.
Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.
Reverse osmosis
- Objective it can address
- Specified dissolved substances at a dedicated outlet, commonly drinking and cooking water.
- Point of treatment
- Typically point of use.
- Limitations to verify
- Produces a reject-water stream and needs pressure and maintenance; verify the exact NSF/ANSI 58 reduction claims for the exact model. It is not automatically the best system for every home.
Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.
When testing is the right next step
Use a certified laboratory when the concern is tap-specific, property-specific, or not resolved by the utility report.
When inspection is the right next step
Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Evidence You Can Check
Official reports, sources, and methodology
Official report — El Toro Water District
2025 DRINKING WATER QUALITY REPORT · data year 2024 · 2024 data retained; monitor for the next official update
View the 2024 El Toro Water District Consumer Confidence ReportSource water, per the report: Drinking water consists of imported treated surface water from MWDSC and treated surface water from IRWD's Baker Water Treatment Plant, which treats surface water from MWDSC and the Santiago Reservoir (Irvine Lake). MWDSC's imported water sources are the Colorado River and the State Water Project, which draws water from the Sacramento-San Joaquin River Delta.
Official report — Moulton Niguel Water District
2024 Water Quality Report · data year 2024 · 2024 data retained; monitor for the next official update
View the 2024 Moulton Niguel Water District Consumer Confidence ReportSource water, per the report: Moulton Niguel relies on imported water from MWD, which sources its water supply from the Colorado River and the State Water Project. The water is treated at the Diemer Water Treatment Plant in Yorba Linda and the Baker Water Treatment Plant in Lake Forest. The Baker Water Treatment Plant also receives untreated surface water from Irvine Lake (Santiago Reservoir).
Official report — Irvine Ranch Water District
2025 Water Quality Report · data year 2024 · 2024 data retained; monitor for the next official update
View the 2024 Irvine Ranch Water District Consumer Confidence ReportSource water, per the report: IRWD water comes from local groundwater, recycled water, local surface water (rainwater capture), and from imported water from Northern California and the Colorado River. Your drinking water is a blend of local groundwater, groundwater from the Orange County Groundwater Basin managed by the Orange County Water District (OCWD), and to a lesser degree surface water imported by Metropolitan Water District of Southern California (MWD), which comes from the State Water Project and the Colorado River Aqueduct. IRWD also has a local watershed that feeds rainwater to Irvine Lake, which IRWD uses as a surface water source.
Nearby community water profiles
Property-Specific Next Step
Request a Water Quality Evaluation
Request a water-heater and water-quality evaluation tailored to the property, equipment, and homeowner objective.
A property-specific evaluation confirms your goals, provider, tap conditions, plumbing, equipment, installation, and maintenance before any treatment recommendation — this profile alone is never used to prescribe equipment.
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