Is Clark Public Utilities Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Clark

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MR	Monitoring	Resolved	2022-01-01 → 2022-12-31
Other	Monitoring	Resolved	2010-07-01
MR	Monitoring	Archived	2008-04-01 → 2008-06-30
MR	Monitoring	Archived	2008-04-01 → 2008-06-30
MR	Monitoring	Archived	2008-04-01 → 2008-06-30
MR	Monitoring	Archived	2008-04-01 → 2008-06-30
MR	Monitoring	Archived	2008-04-01 → 2008-06-30
MR	Monitoring	Archived	2008-04-01 → 2008-06-30
MR	Monitoring	Archived	2008-04-01 → 2008-06-30
MR	Monitoring	Archived	2008-04-01 → 2008-06-30

PFAS detected

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

Contaminant	Max	Detection rate	Period
PFBS	0.0041 µg/L	1/20	2023
Pfhxa	0.0033 µg/L	1/20	2023
PFHXS	0.0053 µg/L	1/20	2023
PFOA	0.0080 µg/L	1/20	2023
PFOS	0.0084 µg/L	1/20	2023

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
Nitrate	2520 µg/L 25% of the EPA limit 10000 µg/L worst single sample: 2800 µg/L	164/430	SYR4	2012–2019
Chloroform	2.4 µg/L No EPA limit set worst single sample: 3.2 µg/L	21/82	SYR4	2012–2019
TTHM	5.6225 µg/L 7% of the EPA limit 80 µg/L worst single sample: 6.05 µg/L	20/20	SYR4	2012–2019
Barium	67.935 µg/L 3.4% of the EPA limit 2000 µg/L worst single sample: 78.9 µg/L	18/30	SYR4	2012–2017
Bromodichloromethane	1.66 µg/L No EPA limit set worst single sample: 2 µg/L	18/57	SYR4	2012–2019
Arsenic	5.35 µg/L 53% of the EPA limit 10 µg/L worst single sample: 6 µg/L	14/31	SYR4	2012–2017
Lead	0.0018 mg/L 12% of the EPA limit 0.0150 mg/L	13/13	LCR	2025
Dibromochloromethane	1.2 µg/L No EPA limit set	12/57	SYR4	2012–2019
Nitrate-Nitrite	1934 µg/L 19% of the EPA limit 10000 µg/L worst single sample: 2220 µg/L	12/30	SYR4	2012–2017
Copper	35 µg/L 2.7% of the EPA limit 1300 µg/L worst single sample: 50 µg/L	11/30	SYR4	2012–2017
Chromium	3.65 µg/L 3.7% of the EPA limit 100 µg/L worst single sample: 4 µg/L	8/30	SYR4	2012–2017
Fluoride	240 µg/L 6% of the EPA limit 4000 µg/L	8/30	SYR4	2012–2017
Dichloroacetic Acid	6.99 µg/L No EPA limit set worst single sample: 7.2 µg/L	4/28	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	21.14 µg/L 35% of the EPA limit 60 µg/L worst single sample: 21.2 µg/L	4/24	SYR4	2012–2019
Trichloroacetic Acid	14.95 µg/L No EPA limit set worst single sample: 15 µg/L	2/28	SYR4	2012–2019
1,1,1-Trichloroethane	1.1 µg/L 0.6% of the EPA limit 200 µg/L	1/54	SYR4	2012–2019
1,1-Dichloroethylene	1.1 µg/L 16% of the EPA limit 7 µg/L	1/54	SYR4	2012–2019
Bromoform	0.5500 µg/L No EPA limit set	1/58	SYR4	2012–2019
Gross Beta Particle Activity	3.3 pCi/L No EPA limit set	1/1	SYR4	2013
Trichloroethylene	0.5000 µg/L 10% of the EPA limit 5 µg/L	1/54	SYR4	2012–2019
Xylenes, Total	0.5100 µg/L 0% of the EPA limit 10000 µg/L	1/54	SYR4	2012–2019

83 contaminants tested, none detected

1,1,2-Trichloroethane1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: John Roth

Frequently asked questions about Clark Public Utilities

Is Clark Public Utilities tap water safe to drink?

EPA monitoring detected 26 contaminants in Clark Public Utilities'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 Clark Public Utilities's water?

EPA monitoring detected Nitrate, Chloroform, TTHM, Barium, Bromodichloromethane, and others. The full list with the level and data source for each is above.

How many people does Clark Public Utilities serve?

Clark Public Utilities reports serving 153,526 people in Washington, per its EPA record.

Has Clark Public Utilities had any water quality violations?

The EPA has 68 violations on file for Clark Public Utilities, of which 0 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.