Washington tap water by county
Hardness, PFAS sampling, lead and violations for the largest water systems in 5 Washington counties. In 4 of them, at least one large system detected PFAS in EPA testing (a detection isn't a violation).
| County | Largest system | Hardness | PFAS detected |
|---|---|---|---|
| King County | Seattle Public Utilities | 1.4 gpg (high) | 4 of 6 systems |
| Pierce County | Tacoma Water Division City of | 2.3 gpg (low) | 6 of 6 systems |
| Snohomish County | Everett Public Works Dept. City of | 1.5 gpg (low) | 0 of 6 systems |
| Spokane County | Spokane City of | 5.1 gpg (low) | 2 of 6 systems |
| Clark County | Vancouver City of | 55–130 mg/L (varies) (high) | 4 of 6 systems |
Public-record figures, not a test of your tap. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
Hardness confidence: high = utility report; low = county estimate of untreated local water. Don't see your county? Use the water quality lookup.