Is Gswc - Claremont Tap Water Safe? Quality Report

Water source: SWP
Ownership: Private
Counties served: Los Angeles

Compliance record

No violations on file. The EPA has no formal drinking-water violations recorded for this supplier.

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
Pfhxa	0.0084 µg/L	8/26	2024
Pfpea	0.0064 µg/L	8/26	2024
PFBS	0.0051 µg/L	5/26	2024
PFOA	0.0129 µg/L	5/26	2024
Pfhpa	0.0046 µg/L	4/26	2024
PFHXS	0.0037 µg/L	3/26	2024
PFOS	0.0104 µg/L	1/26	2024

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
TTHM	54 µg/L 68% of the EPA limit 80 µg/L worst single sample: 68 µg/L	261/473	SYR4	2012–2019
Chloroform	16 µg/L No EPA limit set worst single sample: 27 µg/L	251/477	SYR4	2012–2019
Bromodichloromethane	20 µg/L No EPA limit set worst single sample: 21 µg/L	140/459	SYR4	2012–2019
Dibromochloromethane	22 µg/L No EPA limit set worst single sample: 29 µg/L	140/460	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	24.8 µg/L 41% of the EPA limit 60 µg/L worst single sample: 38 µg/L	125/128	SYR4	2012–2019
Dichloroacetic Acid	10 µg/L No EPA limit set worst single sample: 16 µg/L	119/128	SYR4	2012–2019
Dibromoacetic Acid	7.8 µg/L No EPA limit set worst single sample: 8.3 µg/L	116/128	SYR4	2012–2019
Bromoform	12 µg/L No EPA limit set worst single sample: 13 µg/L	115/460	SYR4	2012–2019
Trichloroacetic Acid	7.65 µg/L No EPA limit set worst single sample: 12 µg/L	106/128	SYR4	2012–2019
Monobromoacetic Acid	4.265 µg/L No EPA limit set worst single sample: 6.2 µg/L	42/128	SYR4	2012–2019
Lead	0.0056 mg/L 37% of the EPA limit 0.0150 mg/L	38/38	LCR	2026
Monochloroacetic Acid	4.875 µg/L No EPA limit set worst single sample: 5.7 µg/L	36/128	SYR4	2012–2019

25 contaminants tested, none detected

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Utility contact

Contact: ZAKHARI, GEORGE
Phone: 760-515-8322
Email: [email protected]

Frequently asked questions about Gswc - Claremont

Is Gswc - Claremont tap water safe to drink?

EPA monitoring detected 19 contaminants in Gswc - Claremont's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Gswc - Claremont's water?

EPA monitoring detected TTHM, Chloroform, Bromodichloromethane, Dibromochloromethane, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Gswc - Claremont serve?

Gswc - Claremont reports serving 39,730 people in California, per its EPA record.

Has Gswc - Claremont had any water quality violations?

The EPA has no formal drinking-water violations on file for Gswc - Claremont.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.