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Tap water quality report

Oak Harbor City of

EPA monitoring tested this supplier for 74 contaminants and detected 9. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

74
contaminants tested
9
detected
23,675
people served
2
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
SWP
Ownership
Local government
Counties served
Island

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.

2
health-based violations
12
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1994-02-01 → 1994-02-28
MCL Health-based Archived 1983-05-01 → 1983-09-30
MR Monitoring Resolved 2024-01-01 → 2024-03-31
MR Monitoring Resolved 2024-01-01 → 2024-03-31
MR Monitoring Resolved 2013-08-01 → 2013-08-31
MR Monitoring Archived 1992-09-01 → 1992-09-30
MR Monitoring Archived 1992-07-01 → 1992-07-31
MR Monitoring Archived 1992-02-01 → 1992-02-29
MR Monitoring Archived 1992-01-01 → 1992-01-31
MR Monitoring Archived 1991-12-01 → 1991-12-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Chloroform
29.39 µg/L
No EPA limit set
worst single sample: 35.8 µg/L
94/96 SYR4 2012–2019
TTHM
30.88 µg/L 39%
of the EPA limit 80 µg/L
worst single sample: 37.2 µg/L
94/94 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
22.84 µg/L 38%
of the EPA limit 60 µg/L
worst single sample: 28.5 µg/L
93/93 SYR4 2012–2019
Dichloroacetic Acid
9.78 µg/L
No EPA limit set
worst single sample: 12.1 µg/L
89/89 SYR4 2012–2019
Trichloroacetic Acid
16.26 µg/L
No EPA limit set
worst single sample: 21.7 µg/L
88/88 SYR4 2012–2019
Bromodichloromethane
1.73 µg/L
No EPA limit set
worst single sample: 2 µg/L
75/78 SYR4 2012–2019
Nitrate
1068.5 µg/L 11%
of the EPA limit 10000 µg/L
worst single sample: 1140 µg/L
34/38 SYR4 2012–2019
Lead
0.0012 mg/L 8%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2024
Gross Beta Particle Activity
4.279 pCi/L
No EPA limit set
worst single sample: 4.28 pCi/L
3/3 SYR4 2015
65 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAsbestosBenzeneBromoformChlorobenzeneCarbon TetrachlorideDichloromethaneDalaponDibromoacetic AcidDibromochloromethaneDinosebEthylene DibromideEthylbenzeneHfpo-DaMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramStyreneTetrachloroethyleneTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Christopher Price

Frequently asked questions about Oak Harbor City of

Is Oak Harbor City of tap water safe to drink?

EPA monitoring detected 9 contaminants in Oak Harbor City of'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 Oak Harbor City of's water?

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

How many people does Oak Harbor City of serve?

Oak Harbor City of reports serving 23,675 people in Washington, per its EPA record.

Has Oak Harbor City of had any water quality violations?

The EPA has 12 violations on file for Oak Harbor City of, of which 2 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.