States →
Washington Water Quality
4,557 public water systems serving 9,736,844 people.
Water Systems
4,557
Total Violations
314,648
Violation Rate
92.1%
PFAS Detection
39.7%
98 of 247 tested
Largest Water Systems
SEATTLE PUBLIC UTILITIES
Seattle, WA · 1,091,904 served
TACOMA WATER DIVISION CITY OF
TACOMA, WA · 448,771 served
VANCOUVER CITY OF
Vancouver, WA · 373,047 served
SPOKANE CITY OF
Spokane, WA · 343,167 served
BELLEVUE CITY OF
Bellevue, WA · 317,330 served
EVERETT PUBLIC WORKS DEPT. CITY OF
Everett, WA · 215,774 served
ALDERWOOD WATER DISTRICT
Lynnwood, WA · 200,000 served
KENT WATER DEPARTMENT
Kent, WA · 166,421 served
REDMOND WATER SYSTEM CITY OF
Redmond, WA · 163,335 served
BELLINGHAM-WATER DIVISION CITY OF
Bellingham, WA · 139,912 served
LAKEHAVEN WATER AND SEWER DISTRICT
FEDERAL WAY, WA · 118,273 served
CLARK PUBLIC UTILITIES
VANCOUVER, WA · 116,876 served
PASCO WATER DEPARTMENT
Pasco, WA · 116,342 served
HIGHLINE WATER DISTRICT
Kent, WA · 115,950 served
KENNEWICK CITY OF
Kennewick, WA · 114,468 served
OLYMPIA CITY OF
OLYMPIA, WA · 113,584 served
Auburn City of
Auburn, WA · 113,095 served
YAKIMA WATER DIVISION CITY OF
Yakima, WA · 112,858 served
SKAGIT COUNTY PUD 1 JUDY RES
Mount Vernon, WA · 111,415 served
RENTON CITY OF
Renton, WA · 107,119 served
Most Violations
#1 LAKE FOREST PARK WATER DISTRICT Lake Forest Park
9,527 #2 Satsop Business Park Aberdeen
5,255 #3 MARBLE WATER SYSTEM Northport
4,269 #4 KELLEY CREST Woodland
4,066 #5 DABOB COVE COMMUNITY Quilcene
3,893 #6 VISTA DEL RIO MOBILE HOME PARK Vancouver
3,450 #7 LEWIS RIVER GOLF COURSE Kelso
3,259 #8 TEMPO LAKE WATER CO Port Orchard
3,044 #9 TEL COMPANY 3 Freeland
2,633 #10 Taggares Fruit Co Burbank
2,455 #11 LEWIS CO WATER DIST #2 Onalaska
2,344 #12 PIONEER Olympia
2,002 #13 OSTROM MUSHROOM FARMS Port Orchard
1,825 #14 ROCHE HARBOR WATER SYSTEM INC Friday Harbor
1,788 #15 WOODLAND PARK MOBIL COURT Yakima
1,788 Counties in Washington
King
217 systems · 3,193,095 served
· 20,636 violations
Pierce
359 systems · 1,138,508 served
· 14,826 violations
Snohomish
170 systems · 947,238 served
· 8,193 violations
Spokane
164 systems · 621,798 served
· 9,829 violations
Clark
72 systems · 615,931 served
· 9,864 violations
Thurston
322 systems · 395,780 served
· 24,330 violations
Kitsap
221 systems · 331,366 served
· 12,667 violations
Benton
113 systems · 281,453 served
· 10,713 violations
Yakima
220 systems · 268,022 served
· 12,104 violations
Whatcom
185 systems · 258,702 served
· 11,873 violations
Skagit
87 systems · 156,499 served
· 2,324 violations
Grant
268 systems · 145,560 served
· 12,635 violations
Franklin
79 systems · 132,513 served
· 3,941 violations
Chelan
132 systems · 118,807 served
· 4,357 violations
Cowlitz
76 systems · 115,789 served
· 13,735 violations
Island
308 systems · 104,049 served
· 25,141 violations
Clallam
101 systems · 91,937 served
· 6,174 violations
Lewis
166 systems · 88,839 served
· 15,450 violations
Grays Harbor
88 systems · 83,246 served
· 13,309 violations
Mason
241 systems · 78,167 served
· 10,829 violations
Walla Walla
69 systems · 75,527 served
· 8,476 violations
Whitman
33 systems · 65,902 served
· 1,462 violations
Kittitas
104 systems · 51,670 served
· 3,250 violations
Jefferson
70 systems · 46,719 served
· 8,616 violations
Okanogan
123 systems · 44,103 served
· 7,257 violations
Douglas
46 systems · 40,088 served
· 3,795 violations
San Juan
112 systems · 39,901 served
· 6,963 violations
Stevens
68 systems · 33,702 served
· 10,726 violations
Pacific
38 systems · 33,692 served
· 3,844 violations
Adams
48 systems · 25,650 served
· 3,951 violations
Showing top 30 of 39 counties.