Coupeville, Washington Water Quality Report
Water quality data for 110 water systems serving 25,056 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| PFBA | 0.005 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.007 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHpA | 0.003 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxA | 0.017 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.004 | 0.010 ug/L | 0.001 ug/L(EWG) | 38% | Within limit |
| PFOA | 0.010 | 0.004 ug/L | 0.090 ug/L(EWG) | 245% | Above limit |
| PFPeA | 0.012 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
Recommended Water Filters
Based on the contaminants detected in your water supply, these filtration systems are recommended:
Reverse Osmosis (RO)
Reverse osmosis systems remove up to 99% of PFAS compounds. Recommended for homes with detected PFAS.
Up to 99% PFAS removal
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Compliance & Violations
Active Violations (17)
71
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
51
Jul 1, 2024
51
Jan 1, 2024
52
Jan 1, 2024
52
Jan 1, 2022
52
Jan 1, 2022
52
Jan 1, 2022
52
Jan 1, 2022
52
Jan 1, 2022
52
Jan 1, 2022
52
Jan 1, 2022
52
Jan 1, 2022
52
Jan 1, 2022
Resolved Violations (983)
71
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
03
Jul 1, 2025 — Sep 30, 2025
71
Jul 1, 2025
+ 978 more resolved violations
Frequently Asked Questions
Is Coupeville tap water safe to drink?
Coupeville's water has 1 contaminant detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in Coupeville tap water?
7 contaminants have been detected in Coupeville's water supply across 110 water systems. See the full contaminant table above for details.
How can I improve my water quality in Coupeville?
Install a water filter rated for the specific contaminants found in Coupeville's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Coupeville have any water quality violations?
Yes, Coupeville currently has 199 active violations. See the violations section above for details.