Your Local Water Profile: El Segundo
This profile explains what the applicable water provider reported for El Segundo, what those results may mean throughout a home, and where property-specific testing or inspection may still be needed.
Water provider: Metropolitan Water District of Southern California
Public water system CA1910040 · 2025 report · Older retained data; verify the latest publication before republishing
View the 2025 Metropolitan Water District of Southern California Consumer Confidence Report (PDF)What the official water report says
Your water at a glance
City of El Segundo Water Division
The report lists hardness as 236 ppm; this is very hard on the USGS scale.
Reported range: 82 - 280 ppm
USGS hardness scale: 0–60 soft; 61–120 moderately hard; 121–180 hard; >180 very hard, in mg/L as CaCO3.
Metropolitan Water District of Southern California — compliance, as reported
The report states: “Metropolitan's drinking water consistently meets or surpasses the stringent state and federal standards required to safeguard public health.”
Violations or advisories, as reported: No violations or advisories were stated in the report.
The Three C's — 1 of 3
Chemistry
What does this water tend to do in a home?
Alkalinity (as CaCO3)
The utility reported: 110 ppm
Reported range: 68 - 124
Reported constituent · report p. [20] · official report
Calcium
The utility reported: 56 ppm
Reported range: 16 - 70
Reported constituent · report p. [20] · official report
Calcium Carbonate Precipitation Potential (CCPP) (as CaCO3)
The utility reported: 7.6 ppm
Reported range: 2.2 - 11
Reported constituent · report p. [20] · official report
Corrosivity as Aggressiveness Index
The utility reported: 12.4 NA
Reported range: 12.1 - 12.5
Reported constituent · report p. [20] · official report
Corrosivity as Saturation Index
The utility reported: 0.58 NA
Reported range: 0.35 - 0.61
Reported constituent · report p. [20] · official report
Hardness (as CaCO3)
The utility reported: 236 ppm
Reported range: 82 - 280
Reported constituent · report p. [20] · official report
Magnesium
The utility reported: 22 ppm
Reported range: 9.7 - 25
Reported constituent · report p. [20] · official report
pH
The utility reported: 8.3 pH Units
Reported range: 8.2 - 8.7
Reported constituent · report p. [20] · official report
Potassium
The utility reported: 4.4 ppm
Reported range: 2.3 - 5.0
Reported constituent · report p. [20] · official report
Sodium
The utility reported: 89 ppm
Reported range: 45 - 100
Reported constituent · report p. [20] · official report
Total Dissolved Solids (TDS)
The utility reported: 525 ppm
Reported range: 173 - 660
Reported constituent · report p. [20] · 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.
Metropolitan Water District of Southern California — regulated contaminants reported as detected (14)
Combined Filter Effluent (CFE) Turbidity
The utility reported: 0.07 NTU
Reported range: 0.05 - 0.07
Benchmark: TT · Health goal (goal): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: Soil runoff
Reported constituent · report p. [18] · official report
Total Coliform Bacteria
The utility reported: 0.08 % Positive Samples
Reported range: 0 - 0.5
Benchmark: TT · Health goal (goal): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Naturally present in the environment
Reported constituent · report p. [18] · official report
Aluminum
The utility reported: 96 ppb
Reported range: ND - 120
Benchmark: 1,000 · Health goal (goal): 600 — not an enforceable limit
Violation per report: No
Typical source, per the report: Residue from some surface water treatment processes; runoff and leaching from natural deposits
Reported constituent · report p. [18] · official report
Fluoride
The utility reported: 0.7 ppm
Reported range: 0.5 - 0.9
Benchmark: 2.0 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Runoff and leaching from natural deposits; water additive that promotes strong teeth; discharge from fertilizer and aluminum factories
Reported constituent · report p. [18] · official report
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 from natural deposits
Reported constituent · report p. [18] · official report
Gross Beta Particle Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 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. [18] · official report
Radium-228
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 1
Benchmark: NA · Health goal (goal): 0.019 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. [18] · official report
Combined Radium -226 + 228
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 1
Benchmark: 5 · 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. [18] · official report
Uranium
The utility reported: 2 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. [18] · official report
Total Trihalomethanes (TTHM)
The utility reported: 33 ppb
Reported range: 9.8 - 55
Benchmark: 80 · Health goal (goal): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
Reported constituent · report p. [19] · official report
Sum of Five Haloacetic Acids (HAA5)
The utility reported: 9.4 ppb
Reported range: ND - 18
Benchmark: 60 · Health goal (goal): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
Reported constituent · report p. [19] · official report
Bromate
The utility reported: 4.1 ppb
Reported range: ND - 12
Benchmark: 10 · Health goal (goal): 0.1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
Reported constituent · report p. [19] · official report
Chloramines (as Total Chlorine Residual)
The utility reported: 2.6 ppm
Reported range: 1.1 - 3.1
Benchmark: 4.0 · Health goal (goal): 4.0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Drinking water disinfectant added for treatment
Reported constituent · report p. [19] · official report
Total Organic Carbon (TOC)
The utility reported: 2.6 ppm
Reported range: 1.5 - 2.9
Benchmark: TT · Health goal (goal): NA — not an enforceable limit
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. [19] · official report
Metropolitan Water District of Southern California — unregulated monitoring and secondary (aesthetic) records (10)
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: 96 ppb
Reported range: ND - 120
Reported constituent · report p. [19] · official report
Chloride
The utility reported: 92 ppm
Reported range: 46 - 99
Reported constituent · report p. [19] · official report
Color
The utility reported: 1 Color Units
Reported range: 1
Reported constituent · report p. [19] · official report
Specific Conductance
The utility reported: 873 μS/cm
Reported range: 386 - 987
Reported constituent · report p. [19] · official report
Sulfate
The utility reported: 182 ppm
Reported range: 25 - 218
Reported constituent · report p. [19] · official report
Total Dissolved Solids (TDS)
The utility reported: 545 ppm
Reported range: 214 - 625
Reported constituent · report p. [19] · official report
Borate
The utility reported: 190 ppb
Reported range: 120 - 190
Reported constituent · report p. [20] · official report
Chlorate
The utility reported: 32 ppb
Reported range: ND - 32
Reported constituent · report p. [20] · official report
Lithium
The utility reported: 35 ppb
Reported range: 26 - 42
Reported constituent · report p. [20] · official report
N-Nitrosodimethylamine (NDMA)
The utility reported: 2.1 ppt
Reported range: ND - 2.8
Reported constituent · report p. [20] · official report
The Three C's — 3 of 3
Corrosion
What conditions could influence pipes, fixtures, and a water heater?
Alkalinity (as CaCO3)
The utility reported: 110 ppm
Reported range: 68 - 124
Reported constituent · report p. [20] · official report
pH
The utility reported: 8.3 pH Units
Reported range: 8.2 - 8.7
Reported constituent · report p. [20] · 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 from natural deposits
Reported constituent · report p. [18] · official report
Chloride
The utility reported: 92 ppm
Reported range: 46 - 99
Reported constituent · report p. [19] · official report
Sulfate
The utility reported: 182 ppm
Reported range: 25 - 218
Reported constituent · report p. [19] · 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 — Metropolitan Water District of Southern California
2026 Annual Drinking Water Quality Report · data year 2025 · Older retained data; verify the latest publication before republishing
View the 2025 Metropolitan Water District of Southern California Consumer Confidence Report (PDF)Source water, per the report: Metropolitan imports water from the Colorado River and Northern California to supplement local supplies. Colorado River water is conveyed via Metropolitan’s 242-mile Colorado River Aqueduct from Lake Havasu on the California-Arizona border, to Lake Mathews near Riverside. Water supplies from Northern California are released from Lake Oroville and drawn from the confluence of the Sacramento and San Joaquin rivers in the California Delta. These supplies are transported in the State Water Project’s 444-mile California Aqueduct.
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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