Washington Tap Water Quality
Explore tap water quality data for counties across Washington. View water system reports, track violations, monitor drinking water safety, and check fluoridation status in your community.
Total Counties
39
Communities with public water systems
Total Population
8,978,497
Residents served by public water systems
Water Systems
2,310
Public water systems statewide
Serious Violators
14
Systems with serious violations
Counties
39
With water systems
Population
8,978,497
Served by water systems
Water Systems
2,310
Total water systems
Violators
14
Systems with serious violations
Searching by your address yields the most accurate results. Searching by town or water system may not show all systems due to how the EPA categorizes data. Some towns may be listed under counties, and water system boundaries don't always align with town boundaries.
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Washington Counties
Adams
Population: 16,950
Water Systems: 30
Asotin
Population: 25,114
Water Systems: 2
Benton
Population: 250,304
Water Systems: 44
Chelan
Population: 91,607
Water Systems: 47
Clallam
Population: 85,019
Water Systems: 62
Clark
Population: 597,102
Water Systems: 25
Columbia
Population: 3,430
Water Systems: 2
Cowlitz
Population: 105,878
Water Systems: 31
Douglas
Population: 36,151
Water Systems: 19
Ferry
Population: 3,644
Water Systems: 11
Franklin
Population: 120,150
Water Systems: 30
Garfield
Population: 1,477
Water Systems: 3
Grant
Population: 89,461
Water Systems: 80
Grays Harbor
Population: 76,749
Water Systems: 35
Island
Population: 91,359
Water Systems: 234
Jefferson
Population: 40,024
Water Systems: 24
King
Population: 3,049,247
Water Systems: 154
Kitsap
Population: 318,083
Water Systems: 151
Kittitas
Population: 35,715
Water Systems: 36
Klickitat
Population: 16,781
Water Systems: 23
Lewis
Population: 65,652
Water Systems: 51
Lincoln
Population: 8,852
Water Systems: 16
Mason
Population: 57,932
Water Systems: 121
Okanogan
Population: 28,176
Water Systems: 42
Pacific
Population: 31,207
Water Systems: 17
Pend Oreille
Population: 9,194
Water Systems: 15
Pierce
Population: 1,080,799
Water Systems: 230
San Juan
Population: 14,682
Water Systems: 42
Skagit
Population: 155,057
Water Systems: 40
Skamania
Population: 9,004
Water Systems: 13
Snohomish
Population: 861,515
Water Systems: 119
Spokane
Population: 602,955
Water Systems: 87
Stevens
Population: 28,809
Water Systems: 33
Thurston
Population: 348,158
Water Systems: 196
Wahkiakum
Population: 3,606
Water Systems: 4
Walla Walla
Population: 66,014
Water Systems: 33
Whatcom
Population: 238,570
Water Systems: 101
Whitman
Population: 67,390
Water Systems: 19
Yakima
Population: 246,680
Water Systems: 88