Coupeville, WA Water Quality (ZIP 98239)

Quick Answers

Is ZIP 98239 tap water safe to drink? PFAS compounds have been detected in 98239's water at an average of 0.01 ppt across 3 compounds. A certified pitcher filter or reverse osmosis system is recommended, especially for sensitive populations.

What filter should I use in 98239? Match the filter to the data: reverse osmosis handles PFAS, lead, and arsenic together; NSF-53 pitchers cover the taps you drink from. A basic Brita pitcher will not remove PFAS.

ZIP 98239 Water Quality Summary

EPA testing has detected PFAS "forever chemicals" in the water system serving ZIP 98239 (Coupeville, WA). Monitoring found a peak of 0.01 ppt across 1 system, averaging 0.01 ppt over 3 detected compounds.

Contamination Level: LOW – Low contamination – PFAS detected but at lower levels; monitoring continues.

Top Detected Compounds in ZIP 98239

• PFHXA: 0.01 ppt
• PFBA: 0.01 ppt
• PFPEA: 0.01 ppt

Lead in ZIP 98239 Water

EPA Lead and Copper Rule testing recorded 316 lead samples for the system serving 98239, with a 90th-percentile high of 0.0489 mg/L (above the EPA 0.015 mg/L action level). There is no safe level of lead for children; homes built before 1986 should use a certified NSF/ANSI 53 lead filter.

EPA Violations Affecting ZIP 98239

The water system serving 98239 have 143 health-based EPA Safe Drinking Water Act violations on record, including Nitrite, Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs), Lead, Lead & Copper Rule. A health-based violation means a contaminant exceeded its federal limit or required treatment was not applied.

About the Data

These figures come from EPA UCMR5 (2023-2025) plus Lead and Copper Rule and SDWIS records for the public water system serving ZIP 98239. UCMR5 is the most comprehensive national drinking water survey in US history.

Beyond water: other exposures in Coupeville, WA

Drinking water is one exposure route. These are the other federal datasets that cover ZIP 98239 and Island County, WA.

Radon risk in Island County, WA

The EPA places Island County, WA in Zone 3 - the EPA's lowest-risk category, with a predicted average indoor radon level below 2 pCi/L. Zone maps predict the radon potential of an area from geology and existing indoor readings - they do not describe any individual home. Radon is the leading cause of lung cancer among people who have never smoked, and the only way to know your own level is a test kit.

Lead paint risk in Island County, WA

Census figures show 36% of homes in Island County, WA were built before 1980, and 6% before 1950. Lead-based paint was banned for residential use in 1978, so older housing stock is the strongest available proxy for lead-paint exposure. This is a statistic about the county's housing, not a test of any particular property - if your home predates 1980, a lead swab test is the way to check.

Air quality in Island County, WA

Modelled annual fine-particle pollution (PM2.5) for Island County, WA averages 7 µg/m³, within the EPA's annual PM2.5 standard of 9 µg/m³. PM2.5 is the pollution fraction small enough to reach deep into the lungs. These are CDC modelled estimates for the county as a whole, not a reading taken at this ZIP code.