Your Local Water Profile: South Pasadena

This profile explains what the applicable water provider reported for South Pasadena, what those results may mean throughout a home, and where property-specific testing or inspection may still be needed.

(877) 798-7487

A water provider's official report describes the public water system and its monitoring period — not every individual home. Plumbing materials, water age, temperature, and equipment can change water after it enters a property. Official report year: 2024.

Water provider: City of South Pasadena

Public water system CA1910154 · 2024 report · 2024 data retained; monitor for the next official update

View the 2024 City of South Pasadena Consumer Confidence Report

What the official water report says

Your water at a glance

City of South Pasadena

The report lists hardness as 150 mg/l; this is hard on the USGS scale.

Reported range: 140 - 150 mg/l

USGS hardness scale: 0–60 soft; 61–120 moderately hard; 121–180 hard; >180 very hard, in mg/L as CaCO3.

Source: official report, p. PAGE 7

City of South Pasadena — compliance, as reported

The report states: “We are proud to report that during 2024, the drinking water provided by the City to your home met or surpassed all federal and state drinking water standards.”

Violations or advisories, as reported: One residence out of 32 sampled exceeded the Action Level for lead. However, the City is in compliance with the Lead and Copper Rule.

The Three C's — 1 of 3

Chemistry

What does this water tend to do in a home?

Alkalinity

The utility reported: 120 mg/l

Reported range: 120

South Pasadena Groundwater · report p. PAGE 7 · official report

Alkalinity

The utility reported: Not detected at the report's stated reporting limit mg/l

Reported range: ND - 82

Pasadena Groundwater · report p. PAGE 7 · official report

Alkalinity

The utility reported: 93 mg/l

Reported range: ND - 150

Metropolitan Imported Water · report p. PAGE 7 · official report

Calcium

The utility reported: 39 mg/l

Reported range: 37 - 40

South Pasadena Groundwater · report p. PAGE 7 · official report

Calcium

The utility reported: 48 mg/l

Reported range: 23 - 87

Pasadena Groundwater · report p. PAGE 7 · official report

Calcium

The utility reported: 110 mg/l

Reported range: 96 - 120

Metropolitan Imported Water · report p. PAGE 7 · official report

Magnesium

The utility reported: 12 mg/l

Reported range: 11 - 12

South Pasadena Groundwater · report p. PAGE 7 · official report

Magnesium

The utility reported: Not detected at the report's stated reporting limit mg/l

Reported range: ND

Pasadena Groundwater · report p. PAGE 7 · official report

Magnesium

The utility reported: 1 mg/l

Reported range: 1

Metropolitan Imported Water · report p. PAGE 7 · official report

The utility reported: 8 pH units

Reported range: 8

South Pasadena Groundwater · report p. PAGE 7 · official report

The utility reported: 1 pH units

Reported range: 1

Pasadena Groundwater · report p. PAGE 7 · official report

The utility reported: Not detected at the report's stated reporting limit pH units

Reported range: ND

Metropolitan Imported Water · report p. PAGE 7 · official report

Hardness as CaCO3

The utility reported: 150 mg/l

Reported range: 140 - 150

South Pasadena Groundwater · report p. PAGE 7 · official report

Hardness as CaCO3

The utility reported: 240 mg/l

Reported range: 210 - 270

Pasadena Groundwater · report p. PAGE 7 · official report

Hardness as CaCO3

The utility reported: 270 mg/l

Reported range: 240 - 300

Metropolitan Imported Water · report p. PAGE 7 · official report

Sodium

The utility reported: 38 mg/l

Reported range: 32 - 43

South Pasadena Groundwater · report p. PAGE 7 · official report

Sodium

The utility reported: 42 mg/l

Reported range: 24 - 73

Pasadena Groundwater · report p. PAGE 7 · official report

Sodium

The utility reported: 110 mg/l

Reported range: 93 - 120

Metropolitan Imported Water · report p. PAGE 7 · official report

Chloride

The utility reported: 21 mg/l

Reported range: 20 - 22

South Pasadena Groundwater · report p. PAGE 6 · official report

Chloride

The utility reported: 48 mg/l

Reported range: 23 - 87

Pasadena Groundwater · report p. PAGE 6 · official report

Chloride

The utility reported: 110 mg/l

Reported range: 96 - 120

Metropolitan Imported Water · report p. PAGE 6 · official report

Sulfate

The utility reported: 39 mg/l

Reported range: 31 - 46

South Pasadena Groundwater · report p. PAGE 6 · official report

Sulfate

The utility reported: 92 mg/l

Reported range: 41 - 180

Pasadena Groundwater · report p. PAGE 6 · official report

Sulfate

The utility reported: 230 mg/l

Reported range: 200 - 250

Metropolitan Imported Water · report p. PAGE 6 · official report

Specific Conductance

The utility reported: 430 \u00b5mho/cm

Reported range: 410 - 440

South Pasadena Groundwater · report p. PAGE 6 · official report

Specific Conductance

The utility reported: 660 \u00b5mho/cm

Reported range: 520 - 880

Pasadena Groundwater · report p. PAGE 6 · official report

Specific Conductance

The utility reported: 1,000 \u00b5mho/cm

Reported range: 910 - 1,100

Metropolitan Imported Water · report p. PAGE 6 · official report

Total Dissolved Solids

The utility reported: 290 mg/l

Reported range: 280 - 290

South Pasadena Groundwater · report p. PAGE 6 · official report

Total Dissolved Solids

The utility reported: 410 mg/l

Reported range: 320 - 560

Pasadena Groundwater · report p. PAGE 6 · official report

Total Dissolved Solids

The utility reported: 630 mg/l

Reported range: 570 - 690

Metropolitan Imported Water · report p. PAGE 6 · official report

Color

The utility reported: Not detected at the report's stated reporting limit Units

Reported range: ND

South Pasadena Groundwater · report p. PAGE 6 · official report

Color

The utility reported: Not detected at the report's stated reporting limit Units

Reported range: ND

Pasadena Groundwater · report p. PAGE 6 · official report

Color

The utility reported: 1 Units

Reported range: 1

Metropolitan Imported Water · report p. PAGE 6 · official report

Odor-Threshold

The utility reported: Not detected at the report's stated reporting limit Units

Reported range: ND

South Pasadena Groundwater · report p. PAGE 6 · official report

Odor-Threshold

The utility reported: 1 Units

Reported range: 1

Pasadena Groundwater · report p. PAGE 6 · official report

Odor-Threshold

The utility reported: Not detected at the report's stated reporting limit Units

Reported range: ND

Metropolitan Imported Water · report p. PAGE 6 · official report

Turbidity

The utility reported: 0.14 NTU

Reported range: 0.13 - 0.15

South Pasadena Groundwater · report p. PAGE 6 · official report

Turbidity

The utility reported: 0.1 NTU

Reported range: ND - 0.1

Pasadena Groundwater · report p. PAGE 6 · official report

Turbidity

The utility reported: Not detected at the report's stated reporting limit NTU

Reported range: ND

Metropolitan Imported Water · report p. PAGE 6 · official report

Filter Effluent Turbidity

The utility reported: 0.06 NTU

Reported range: --

Metropolitan Imported Water · report p. PAGE 6 · official report

Total Trihalomethanes (TTHM)

The utility reported: 3.1 \u00b5g/l

Reported range: ND - 3

South Pasadena Distribution System · report p. PAGE 6 · official report

Haloacetic acids (five) (HAA5)

The utility reported: 1.2 \u00b5g/l

Reported range: ND - 1.2

South Pasadena Distribution System · report p. PAGE 6 · official report

Chlorine Residual

The utility reported: 0.46 mg/l

Reported range: 0.2 - 1.6

South Pasadena Distribution System · report p. PAGE 6 · official report

Tetrachloroethylene (PCE)

The utility reported: 1.8 \u00b5g/l

Reported range: ND - 3

South Pasadena Groundwater · report p. PAGE 6 · official report

Trichloroethylene (TCE)

The utility reported: 1.3 \u00b5g/l

Reported range: ND - 2.4

South Pasadena Groundwater · report p. PAGE 6 · official report

Barium

The utility reported: 0.12 mg/l

Reported range: 0.12

Metropolitan Imported Water · report p. PAGE 6 · official report

Bromate

The utility reported: 2 \u00b5g/l

Reported range: ND - 9.2

Metropolitan Imported Water · report p. PAGE 6 · official report

Copper

The utility reported: 0.48 mg/l

Reported range: 0 / 32 Samples Exceeded the AL

South Pasadena Distribution System · report p. PAGE 6 · official report

Fluoride (Naturally-occurring)

The utility reported: 0.75 mg/l

Reported range: 0.72 - 0.78

South Pasadena Groundwater · report p. PAGE 6 · official report

Fluoride (Naturally-occurring)

The utility reported: 0.8 mg/l

Reported range: 0.5 - 1.2

Pasadena Groundwater · report p. PAGE 6 · official report

Fluoride (Treatment-related)

The utility reported: 0.7 mg/l

Reported range: 0.3 - 0.8

Metropolitan Imported Water · report p. PAGE 6 · official report

Hexavalent Chromium

The utility reported: 3.5 \u00b5g/l

Reported range: 2.3 - 4.6

South Pasadena Groundwater · report p. PAGE 6 · official report

Hexavalent Chromium

The utility reported: 3.1 \u00b5g/l

Reported range: 1.5 - 5.2

Pasadena Groundwater · report p. PAGE 6 · official report

Lead

The utility reported: Not detected at the report's stated reporting limit \u00b5g/l

Reported range: 1 / 32 Samples Exceeded the AL

South Pasadena Distribution System · report p. PAGE 6 · official report

Nitrate as N

The utility reported: 4.8 mg/l

Reported range: ND - 6.8

South Pasadena Groundwater · report p. PAGE 6 · official report

Nitrate as N

The utility reported: 4.5 mg/l

Reported range: ND - 6.3

Pasadena Groundwater · report p. PAGE 6 · official report

Perchlorate

The utility reported: 1.2 \u00b5g/l

Reported range: ND - 2.8

South Pasadena Groundwater · report p. PAGE 6 · official report

Perchlorate

The utility reported: 1.6 \u00b5g/l

Reported range: ND - 4

Pasadena Groundwater · report p. PAGE 6 · official report

Gross Alpha Particle Activity

The utility reported: 8 pCi/l

Reported range: ND - 14

Pasadena Groundwater · report p. PAGE 6 · official report

Uranium

The utility reported: 1.5 pCi/l

Reported range: 1.5

South Pasadena Groundwater · report p. PAGE 6 · official report

Uranium

The utility reported: 10 pCi/l

Reported range: ND - 16

Pasadena Groundwater · report p. PAGE 6 · official report

Chemistry is not a safety grade, and utility-level values do not guarantee conditions at a property.

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.

City of South Pasadena — regulated contaminants reported as detected (22)

Filter Effluent Turbidity

The utility reported: 0.06 NTU

Reported range: --

Benchmark: TT = 1 NTU · Health goal (goal): NA — not an enforceable limit

Violation per report: No

Typical source, per the report: Soil runoff

Reported constituent · report p. PAGE 6 · official report

Total Trihalomethanes (TTHM)

The utility reported: 3.1 \u00b5g/l

Reported range: ND - 3

Benchmark: 80 · Health goal (goal): NA — not an enforceable limit

Violation per report: No

Typical source, per the report: By-product of drinking water disinfection

Reported constituent · report p. PAGE 6 · official report

Haloacetic acids (five) (HAA5)

The utility reported: 1.2 \u00b5g/l

Reported range: ND - 1.2

Benchmark: 60 · Health goal (goal): NA — not an enforceable limit

Violation per report: No

Typical source, per the report: By-product of drinking water disinfection

Reported constituent · report p. PAGE 6 · official report

Chlorine Residual

The utility reported: 0.46 mg/l

Reported range: 0.2 - 1.6

Benchmark: [4] · Health goal (goal): [4] — not an enforceable limit

Violation per report: No

Typical source, per the report: Drinking water disinfectant

Reported constituent · report p. PAGE 6 · official report

Tetrachloroethylene (PCE)

The utility reported: 1.8 \u00b5g/l

Reported range: ND - 3

Benchmark: 5 · Health goal (goal): 0.06 — not an enforceable limit

Violation per report: No

Typical source, per the report: Discharge from industrial activities

Reported constituent · report p. PAGE 6 · official report

Trichloroethylene (TCE)

The utility reported: 1.3 \u00b5g/l

Reported range: ND - 2.4

Benchmark: 5 · Health goal (goal): 1.7 — not an enforceable limit

Violation per report: No

Typical source, per the report: Discharge from industrial activities

Reported constituent · report p. PAGE 6 · official report

Barium

The utility reported: 0.12 mg/l

Reported range: 0.12

Benchmark: 1 · Health goal (goal): 2 — 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

Bromate

The utility reported: 2 \u00b5g/l

Reported range: ND - 9.2

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. PAGE 6 · official report

Copper

The utility reported: 0.48 mg/l

Reported range: 0 / 32 Samples Exceeded the AL

Benchmark: AL = 1.3 · Health goal (goal): 0.3 — not an enforceable limit

Violation per report: No

Typical source, per the report: Corrosion of household plumbing system

Reported constituent · report p. PAGE 6 · official report

Fluoride (Naturally-occurring)

The utility reported: 0.75 mg/l

Reported range: 0.72 - 0.78

Benchmark: 2 · Health goal (goal): 1 — 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

Fluoride (Naturally-occurring)

The utility reported: 0.8 mg/l

Reported range: 0.5 - 1.2

Benchmark: 2 · Health goal (goal): 1 — 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

Fluoride (Treatment-related)

The utility reported: 0.7 mg/l

Reported range: 0.3 - 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 6 · official report

Hexavalent Chromium

The utility reported: 3.5 \u00b5g/l

Reported range: 2.3 - 4.6

Benchmark: 10 · Health goal (goal): 0.02 — not an enforceable limit

Violation per report: No

Typical source, per the report: Erosion of natural deposits, Industrial waste discharge

Reported constituent · report p. PAGE 6 · official report

Hexavalent Chromium

The utility reported: 3.1 \u00b5g/l

Reported range: 1.5 - 5.2

Benchmark: 10 · Health goal (goal): 0.02 — not an enforceable limit

Violation per report: No

Typical source, per the report: Erosion of natural deposits, Industrial waste discharge

Reported constituent · report p. PAGE 6 · official report

Lead

The utility reported: Not detected at the report's stated reporting limit \u00b5g/l

Reported range: 1 / 32 Samples Exceeded the AL

Benchmark: AL = 15 · Health goal (goal): 0.2 — not an enforceable limit

Violation per report: No

Typical source, per the report: Corrosion of household plumbing system

Reported constituent · report p. PAGE 6 · official report

Nitrate as N

The utility reported: 4.8 mg/l

Reported range: ND - 6.8

Benchmark: 10 · Health goal (goal): 10 — not an enforceable limit

Violation per report: No

Typical source, per the report: Leaching from fertilizer use

Reported constituent · report p. PAGE 6 · official report

Nitrate as N

The utility reported: 4.5 mg/l

Reported range: ND - 6.3

Benchmark: 10 · Health goal (goal): 10 — not an enforceable limit

Violation per report: No

Typical source, per the report: Leaching from fertilizer use

Reported constituent · report p. PAGE 6 · official report

Perchlorate

The utility reported: 1.2 \u00b5g/l

Reported range: ND - 2.8

Benchmark: 6 · Health goal (goal): 1 — not an enforceable limit

Violation per report: No

Typical source, per the report: Discharge from industrial activities

Reported constituent · report p. PAGE 6 · official report

Perchlorate

The utility reported: 1.6 \u00b5g/l

Reported range: ND - 4

Benchmark: 6 · Health goal (goal): 1 — not an enforceable limit

Violation per report: No

Typical source, per the report: Discharge from industrial activities

Reported constituent · report p. PAGE 6 · official report

Gross Alpha Particle Activity

The utility reported: 8 pCi/l

Reported range: ND - 14

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

Uranium

The utility reported: 1.5 pCi/l

Reported range: 1.5

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

Uranium

The utility reported: 10 pCi/l

Reported range: ND - 16

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

City of South Pasadena — unregulated monitoring and secondary (aesthetic) records (35)

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: 93 \u00b5g/l

Reported range: ND - 150

Typical source, per the report: Used for filtration treatment of surface water

Reported constituent · report p. PAGE 6 · official report

Chloride

The utility reported: 21 mg/l

Reported range: 20 - 22

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 6 · official report

Chloride

The utility reported: 48 mg/l

Reported range: 23 - 87

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 6 · official report

Chloride

The utility reported: 110 mg/l

Reported range: 96 - 120

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 6 · official report

Color

The utility reported: 1 Units

Reported range: 1

Typical source, per the report: Naturally occurring organic materials

Reported constituent · report p. PAGE 6 · official report

Odor-Threshold

The utility reported: 1 Units

Reported range: 1

Typical source, per the report: Naturally occurring organic materials

Reported constituent · report p. PAGE 6 · official report

Specific Conductance

The utility reported: 430 \u00b5mho/cm

Reported range: 410 - 440

Typical source, per the report: Substances that form ions in water

Reported constituent · report p. PAGE 6 · official report

Specific Conductance

The utility reported: 660 \u00b5mho/cm

Reported range: 520 - 880

Typical source, per the report: Substances that form ions in water

Reported constituent · report p. PAGE 6 · official report

Specific Conductance

The utility reported: 1,000 \u00b5mho/cm

Reported range: 910 - 1,100

Typical source, per the report: Substances that form ions in water

Reported constituent · report p. PAGE 6 · official report

Sulfate

The utility reported: 39 mg/l

Reported range: 31 - 46

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 6 · official report

Sulfate

The utility reported: 92 mg/l

Reported range: 41 - 180

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 6 · official report

Sulfate

The utility reported: 230 mg/l

Reported range: 200 - 250

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 6 · official report

Total Dissolved Solids

The utility reported: 290 mg/l

Reported range: 280 - 290

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 6 · official report

Total Dissolved Solids

The utility reported: 410 mg/l

Reported range: 320 - 560

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 6 · official report

Total Dissolved Solids

The utility reported: 630 mg/l

Reported range: 570 - 690

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 6 · official report

Turbidity

The utility reported: 0.14 NTU

Reported range: 0.13 - 0.15

Typical source, per the report: Soil runoff

Reported constituent · report p. PAGE 6 · official report

Turbidity

The utility reported: 0.1 NTU

Reported range: ND - 0.1

Typical source, per the report: Soil runoff

Reported constituent · report p. PAGE 6 · official report

Alkalinity

The utility reported: 120 mg/l

Reported range: 120

Typical source, per the report: Used for filtration treatment of surface water

Reported constituent · report p. PAGE 7 · official report

Alkalinity

The utility reported: 93 mg/l

Reported range: ND - 150

Typical source, per the report: Used for filtration treatment of surface water

Reported constituent · report p. PAGE 7 · official report

Calcium

The utility reported: 39 mg/l

Reported range: 37 - 40

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 7 · official report

Calcium

The utility reported: 48 mg/l

Reported range: 23 - 87

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 7 · official report

Calcium

The utility reported: 110 mg/l

Reported range: 96 - 120

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 7 · official report

Magnesium

The utility reported: 12 mg/l

Reported range: 11 - 12

Typical source, per the report: Naturally occurring organic materials

Reported constituent · report p. PAGE 7 · official report

Magnesium

The utility reported: 1 mg/l

Reported range: 1

Typical source, per the report: Naturally occurring organic materials

Reported constituent · report p. PAGE 7 · official report

The utility reported: 8 pH units

Reported range: 8

Typical source, per the report: Naturally occurring organic materials

Reported constituent · report p. PAGE 7 · official report

The utility reported: 1 pH units

Reported range: 1

Typical source, per the report: Naturally occurring organic materials

Reported constituent · report p. PAGE 7 · official report

Potassium

The utility reported: 1.8 mg/l

Reported range: 1.7 - 1.9

Typical source, per the report: Substances that form ions in water

Reported constituent · report p. PAGE 7 · official report

Potassium

The utility reported: 660 mg/l

Reported range: 520 - 880

Typical source, per the report: Substances that form ions in water

Reported constituent · report p. PAGE 7 · official report

Potassium

The utility reported: 1,000 mg/l

Reported range: 910 - 1,100

Typical source, per the report: Substances that form ions in water

Reported constituent · report p. PAGE 7 · official report

Hardness as CaCO3

The utility reported: 150 mg/l

Reported range: 140 - 150

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 7 · official report

Hardness as CaCO3

The utility reported: 240 mg/l

Reported range: 210 - 270

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 7 · official report

Hardness as CaCO3

The utility reported: 270 mg/l

Reported range: 240 - 300

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 7 · official report

Sodium

The utility reported: 38 mg/l

Reported range: 32 - 43

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 7 · official report

Sodium

The utility reported: 42 mg/l

Reported range: 24 - 73

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 7 · official report

Sodium

The utility reported: 110 mg/l

Reported range: 93 - 120

Typical source, per the report: Runoff/leaching from natural deposits

Reported constituent · report p. PAGE 7 · official report

Detection, enforceable limits, health goals, advisory levels, and violations are different concepts.

The Three C's — 3 of 3

Corrosion

What conditions could influence pipes, fixtures, and a water heater?

Alkalinity

The utility reported: 120 mg/l

Reported range: 120

South Pasadena Groundwater · report p. PAGE 7 · official report

Alkalinity

The utility reported: Not detected at the report's stated reporting limit mg/l

Reported range: ND - 82

Pasadena Groundwater · report p. PAGE 7 · official report

Alkalinity

The utility reported: 93 mg/l

Reported range: ND - 150

Metropolitan Imported Water · report p. PAGE 7 · official report

The utility reported: 8 pH units

Reported range: 8

South Pasadena Groundwater · report p. PAGE 7 · official report

The utility reported: 1 pH units

Reported range: 1

Pasadena Groundwater · report p. PAGE 7 · official report

The utility reported: Not detected at the report's stated reporting limit pH units

Reported range: ND

Metropolitan Imported Water · report p. PAGE 7 · official report

Chloride

The utility reported: 21 mg/l

Reported range: 20 - 22

South Pasadena Groundwater · report p. PAGE 6 · official report

Chloride

The utility reported: 48 mg/l

Reported range: 23 - 87

Pasadena Groundwater · report p. PAGE 6 · official report

Chloride

The utility reported: 110 mg/l

Reported range: 96 - 120

Metropolitan Imported Water · report p. PAGE 6 · official report

Sulfate

The utility reported: 39 mg/l

Reported range: 31 - 46

South Pasadena Groundwater · report p. PAGE 6 · official report

Sulfate

The utility reported: 92 mg/l

Reported range: 41 - 180

Pasadena Groundwater · report p. PAGE 6 · official report

Sulfate

The utility reported: 230 mg/l

Reported range: 200 - 250

Metropolitan Imported Water · report p. PAGE 6 · official report

Copper

The utility reported: 0.48 mg/l

Reported range: 0 / 32 Samples Exceeded the AL

South Pasadena Distribution System · report p. PAGE 6 · official report

Lead

The utility reported: Not detected at the report's stated reporting limit \u00b5g/l

Reported range: 1 / 32 Samples Exceeded the AL

South Pasadena Distribution System · report p. PAGE 6 · official report

Gross Alpha Particle Activity

The utility reported: 8 pCi/l

Reported range: ND - 14

Pasadena Groundwater · report p. PAGE 6 · official report

This is system-level water-quality context, not a diagnosis of your home. Plumbing materials, water age, temperature, maintenance, and equipment design can materially change what happens at a specific property.

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 — City of South Pasadena

2024 South Pasadena Water Quality Report · data year 2024 · 2024 data retained; monitor for the next official update

View the 2024 City of South Pasadena Consumer Confidence Report

Source water, per the report: The water supply for the City comes from three sources: (1) groundwater pumped from wells in the Main San Gabriel Groundwater Basin, (2) surface water imported by Metropolitan Water District of Southern California (Metropolitan) from the Colorado River and from Northern California, and (3) groundwater from the City of Pasadena, which includes Metropolitan water, that is supplied to only the City's Pasadena Zone.

The official utility report and controlling regulator determine compliance status. This page does not replace utility notices or regulator guidance.

Profile verified as of 2026-07-12 (framework v1.0). Values, units, ranges, periods, and compliance wording are preserved from each official report. Spot an error? Call (877) 798-7487 or use the contact form and we'll review it against the source report and correct it.

Nearby community water profiles

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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.

Request a Water Quality Evaluation (877) 798-7487

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