Washington County Water Quality Reports

Adams County, WA: 23 Violations — 69/100 (2026)

2026 report: Adams County, WA scores 69/100 (Grade C). 6 ZIP codes analyzed. 23 EPA violations found. Free report with contaminant data and filter picks.

Asotin County, WA Water Safety: 76/100 (2026)

2026 report: Asotin County, WA scores 76/100 (Grade B). 3 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.

Benton County, WA: 14 Health Violations — 69/100 (2026)

2026 report: Benton County, WA scores 69/100 (Grade C). 8 ZIP codes analyzed. 39 EPA violations found. Free report with contaminant data and filter picks.

Chelan County, WA: 1 Health Violation — 86/100 (2026)

2026 report: Chelan County, WA scores 86/100 (Grade A). 13 ZIP codes analyzed. 36 EPA violations found. Free report with contaminant data and filter picks.

Clallam County, WA: 25 Violations — 81/100 (2026)

2026 report: Clallam County, WA scores 81/100 (Grade B). 15 ZIP codes analyzed. 25 EPA violations found. Free report with contaminant data and filter pi...

Clark County, WA: 14 Health Violations — 63/100 (2026)

2026 report: Clark County, WA scores 63/100 (Grade C). 24 ZIP codes analyzed. 39 EPA violations found. Free report with contaminant data and filter picks.

Columbia County, WA: 2 Violations — 80/100 (2026)

2026 report: Columbia County, WA scores 80/100 (Grade B). 2 ZIP codes analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Cowlitz County, WA: 15 Violations — 76/100 (2026)

2026 report: Cowlitz County, WA scores 76/100 (Grade B). 9 ZIP codes analyzed. 15 EPA violations found. Free report with contaminant data and filter picks.

Douglas County, WA: 23 Violations — 74/100 (2026)

2026 report: Douglas County, WA scores 74/100 (Grade B). 7 ZIP codes analyzed. 23 EPA violations found. Free report with contaminant data and filter picks.

Ferry County, WA: 46 Violations — 54/100 (2026)

2026 report: Ferry County, WA scores 54/100 (Grade D). 6 ZIP codes analyzed. 46 EPA violations found. Free report with contaminant data and filter picks.

Franklin County, WA: 7 Health Violations — 77/100 (2026)

2026 report: Franklin County, WA scores 77/100 (Grade B). 6 ZIP codes analyzed. 57 EPA violations found. Free report with contaminant data and filter pi...

Garfield County, WA: 2 Violations — 82/100 (2026)

2026 report: Garfield County, WA scores 82/100 (Grade B). 1 ZIP code analyzed. 2 EPA violations found. Free report with contaminant data and filter picks.

Grant County, WA: 2 Health Violations — 74/100 (2026)

2026 report: Grant County, WA scores 74/100 (Grade B). 16 ZIP codes analyzed. 73 EPA violations found. Free report with contaminant data and filter picks.

Grays Harbor County, WA: 5 Health Violations — 77/100 (2026)

2026 report: Grays Harbor County, WA scores 77/100 (Grade B). 22 ZIP codes analyzed. 46 EPA violations found. Free report with contaminant data and filt...

Island County, WA: 13 Health Violations — 78/100 (2026)

2026 report: Island County, WA scores 78/100 (Grade B). 9 ZIP codes analyzed. 71 EPA violations found. Free report with contaminant data and filter picks.

Jefferson County, WA: 15 Violations — 81/100 (2026)

2026 report: Jefferson County, WA scores 81/100 (Grade B). 7 ZIP codes analyzed. 15 EPA violations found. Free report with contaminant data and filter p...

King County, WA: 1 Health Violation — 91/100 (2026)

2026 report: King County, WA scores 91/100 (Grade A). 122 ZIP codes analyzed. 186 EPA violations found. Free report with contaminant data and filter picks.

Kitsap County, WA: 11 Violations — 83/100 (2026)

2026 report: Kitsap County, WA scores 83/100 (Grade B). 21 ZIP codes analyzed. 11 EPA violations found. Free report with contaminant data and filter picks.

Kittitas County, WA: 1 Health Violation — 73/100 (2026)

2026 report: Kittitas County, WA scores 73/100 (Grade B). 10 ZIP codes analyzed. 20 EPA violations found. Free report with contaminant data and filter p...

Klickitat County, WA: 2 Health Violations — 63/100 (2026)

2026 report: Klickitat County, WA scores 63/100 (Grade C). 15 ZIP codes analyzed. 18 EPA violations found. Free report with contaminant data and filter ...

Lewis County, WA: Lead Above EPA Limits — 80/100 (2026)

2026 report: Lewis County, WA scores 80/100 (Grade B). 22 ZIP codes analyzed. 53 EPA violations found. Lead above EPA limits. Free report with contamina...

Lincoln County, WA: 21 Violations — 69/100 (2026)

2026 report: Lincoln County, WA scores 69/100 (Grade C). 12 ZIP codes analyzed. 21 EPA violations found. Free report with contaminant data and filter pi...

Mason County, WA: 7 Violations — 92/100 (2026)

2026 report: Mason County, WA scores 92/100 (Grade A). 9 ZIP codes analyzed. 7 EPA violations found. Free report with contaminant data and filter picks.

Okanogan County, WA: 2 Health Violations — 60/100 (2026)

2026 report: Okanogan County, WA scores 60/100 (Grade C). 20 ZIP codes analyzed. 54 EPA violations found. Free report with contaminant data and filter p...

Pacific County, WA: Lead Above EPA Limits — 73/100 (2026)

2026 report: Pacific County, WA scores 73/100 (Grade B). 15 ZIP codes analyzed. 17 EPA violations found. Lead above EPA limits. Free report with contami...

Pend Oreille County, WA: 38 Violations — 59/100 (2026)

2026 report: Pend Oreille County, WA scores 59/100 (Grade C). 7 ZIP codes analyzed. 38 EPA violations found. Free report with contaminant data and filte...

Pierce County, WA: 125 Violations — 89/100 (2026)

2026 report: Pierce County, WA scores 89/100 (Grade A). 85 ZIP codes analyzed. 125 EPA violations found. Free report with contaminant data and filter pi...

San Juan County, WA: 25 Health Violations — 74/100 (2026)

2026 report: San Juan County, WA scores 74/100 (Grade B). 9 ZIP codes analyzed. 42 EPA violations found. Free report with contaminant data and filter pi...

Skagit County, WA: 20 Violations — 81/100 (2026)

2026 report: Skagit County, WA scores 81/100 (Grade B). 16 ZIP codes analyzed. 20 EPA violations found. Free report with contaminant data and filter picks.

Skamania County, WA: Lead Above EPA Limits — 61/100 (2026)

2026 report: Skamania County, WA scores 61/100 (Grade C). 5 ZIP codes analyzed. 18 EPA violations found. Lead above EPA limits. Free report with contami...

Snohomish County, WA: 150 Violations — 83/100 (2026)

2026 report: Snohomish County, WA scores 83/100 (Grade B). 34 ZIP codes analyzed. 150 EPA violations found. Free report with contaminant data and filter...

Spokane County, WA: 1 Health Violation — 64/100 (2026)

2026 report: Spokane County, WA scores 64/100 (Grade C). 51 ZIP codes analyzed. 48 EPA violations found. Free report with contaminant data and filter pi...

Stevens County, WA: 31 Violations — 47/100 (2026)

2026 report: Stevens County, WA scores 47/100 (Grade D). 20 ZIP codes analyzed. 31 EPA violations found. Free report with contaminant data and filter pi...

Thurston County, WA: 7 Health Violations — 91/100 (2026)

2026 report: Thurston County, WA scores 91/100 (Grade A). 21 ZIP codes analyzed. 37 EPA violations found. Free report with contaminant data and filter p...

Wahkiakum County, WA: 5 Violations — 73/100 (2026)

2026 report: Wahkiakum County, WA scores 73/100 (Grade B). 3 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter pi...

Walla Walla County, WA: 7 Health Violations — 67/100 (2026)

2026 report: Walla Walla County, WA scores 67/100 (Grade C). 9 ZIP codes analyzed. 48 EPA violations found. Free report with contaminant data and filter...

Whatcom County, WA: 5 Health Violations — 88/100 (2026)

2026 report: Whatcom County, WA scores 88/100 (Grade A). 16 ZIP codes analyzed. 42 EPA violations found. Free report with contaminant data and filter pi...

Whitman County, WA: 39 Violations — 69/100 (2026)

2026 report: Whitman County, WA scores 69/100 (Grade C). 24 ZIP codes analyzed. 39 EPA violations found. Free report with contaminant data and filter pi...

Yakima County, WA: 11 Health Violations — 71/100 (2026)

2026 report: Yakima County, WA scores 71/100 (Grade B). 26 ZIP codes analyzed. 88 EPA violations found. Free report with contaminant data and filter picks.