Is Golden State Water Company - Nipomo Tap Water Safe? Quality Report

Water source: SWP
Ownership: Private
Counties served: San Luis Obispo

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
Pfpea	0.0032 µg/L	1/6	2025

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	13000 µg/L 130% of the EPA limit, in the worst sample — 10000 µg/L	3908/4342	SYR4	2012–2019
Lead	0.0052 mg/L 35% of the EPA limit 0.0150 mg/L	48/48	LCR	2023
Fluoride	300 µg/L 7.5% of the EPA limit 4000 µg/L	6/10	SYR4	2014–2017
Bromodichloromethane	2.3 µg/L No EPA limit set	5/5	SYR4	2013–2019
Bromoform	3.7 µg/L No EPA limit set	5/5	SYR4	2013–2019
Dibromoacetic Acid	2 µg/L No EPA limit set	5/5	SYR4	2013–2019
Dibromochloromethane	4.1 µg/L No EPA limit set	5/5	SYR4	2013–2019
TTHM	10 µg/L 13% of the EPA limit 80 µg/L	5/5	SYR4	2013–2019
Nitrate-Nitrite	9900 µg/L 99% of the EPA limit 10000 µg/L	4/6	SYR4	2014–2017
Total Haloacetic Acids (HAA5)	4.3 µg/L 7.2% of the EPA limit 60 µg/L	4/5	SYR4	2013–2019
Monochloroacetic Acid	2.8 µg/L No EPA limit set	2/5	SYR4	2013–2019
Lithium	10.7 µg/L No EPA limit set	2/6	UCMR-5	2025

67 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBariumBenzeneBeryllium, TotalChlorobenzeneCopperCadmiumCarbon TetrachlorideChloroformChromiumDichloromethaneDichloroacetic AcidEthylbenzeneHfpo-DaLeadMercuryMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: WHITE, DAWN
Phone: 916-853-3615
Email: Dawn.White@gswater.com

Frequently asked questions about Golden State Water Company - Nipomo

Is Golden State Water Company - Nipomo tap water safe to drink?

EPA monitoring detected 13 contaminants in Golden State Water Company - Nipomo'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 Golden State Water Company - Nipomo's water?

EPA monitoring detected Nitrate, Lead, Fluoride, Bromodichloromethane, Bromoform, and others. The full list with the level and data source for each is above.

How many people does Golden State Water Company - Nipomo serve?

Golden State Water Company - Nipomo reports serving 4,506 people in California, per its EPA record.

Has Golden State Water Company - Nipomo had any water quality violations?

The EPA has no formal drinking-water violations on file for Golden State Water Company - Nipomo.

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.