Is Yacolt 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
TT	Health-based	Resolved	2022-10-02
MCL	Health-based	Archived	1997-01-01 → 1997-01-31
MCL	Health-based	Archived	1997-01-01 → 1997-01-31
MCL	Health-based	Archived	1997-01-01 → 1997-01-31
MCL	Health-based	Archived	1996-06-01 → 1996-06-30
MCL	Health-based	Archived	1995-12-01 → 1995-12-31
MCL	Health-based	Archived	1995-08-01 → 1995-08-31
MCL	Health-based	Archived	1994-06-01 → 1994-06-30
MCL	Health-based	Archived	1992-12-01 → 1992-12-31
MCL	Health-based	Archived	1992-09-01 → 1992-09-30

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	2900 µg/L 29% of the EPA limit 10000 µg/L	32/32	SYR4	2012–2019
Lead	0.0019 mg/L 13% of the EPA limit 0.0150 mg/L	11/11	LCR	2015
Chloroform	0.9900 µg/L No EPA limit set	8/17	SYR4	2013–2019
TTHM	0.9900 µg/L 1.2% of the EPA limit 80 µg/L	8/8	SYR4	2013–2019
Copper	13 µg/L 1% of the EPA limit 1300 µg/L	3/3	SYR4	2013–2018
Total Haloacetic Acids (HAA5)	1.1 µg/L 1.8% of the EPA limit 60 µg/L	3/11	SYR4	2013–2018
Dichloroacetic Acid	1.1 µg/L No EPA limit set	2/12	SYR4	2013–2019
Monochloroacetic Acid	0.5500 µg/L No EPA limit set	2/12	SYR4	2013–2019
Chromium	2 µg/L 2% of the EPA limit 100 µg/L	1/1	SYR4	2013
Nitrate-Nitrite	2160 µg/L 22% of the EPA limit 10000 µg/L	1/1	SYR4	2013

47 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicBariumBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbon TetrachlorideDichloromethaneDalaponDibromoacetic AcidDibromochloromethaneDinosebEthylene DibromideEthylbenzeneFluorideLeadMercuryMonobromoacetic AcidNitritePentachlorophenolPicloramSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: John Roth

Frequently asked questions about Yacolt

Is Yacolt tap water safe to drink?

EPA monitoring detected 10 contaminants in Yacolt'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 Yacolt's water?

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

How many people does Yacolt serve?

Yacolt reports serving 3,034 people in Washington, per its EPA record.

Has Yacolt had any water quality violations?

The EPA has 79 violations on file for Yacolt, of which 16 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.