Tapcensus

Washington

King County drinking water quality

217 active public water systems serve 3,322,257 people in King County. 131 are compliant, 86 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.

Active systems 217 156 community systems
People served 3.3M by public water systems
Systems with violations 86 40% of active systems, past 3 years
Serious violators 0 0 systems carry a health flag

Community water systems

156 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Seattle Public Utilities
 1,161,961 0 0
Bellevue City of
 321,349 0 0
Kent Water Department
 166,421 1 0
Redmond Water System City of
 163,335 0 0
Lakehaven Water and Sewer District
 148,809 0 0
Renton City of
 108,091 0 0
Auburn City of
 107,655 1 0
Highline Water District
 100,170 0 0
Northshore Utility District
 99,789 0 0
Sammamish Plateau Water & Sewer
 79,362 0 0
Soos Creek Water & Sewer District
 74,172 0 0
Kirkland City of
 69,243 0 0
Woodinville Water District
 66,699 0 0
Covington Water District
 56,172 0 0
King County Water District #20
 48,469 0 0
Issaquah Water System
 43,584 0 0
Tukwila Water Department
 36,298 0 0
Bothell Water City of
 33,643 1 0
North City Water District
 32,847 0 0
Mercer Island City of
 31,057 0 0
Cedar River Water & Sewer District
 28,671 0 0
Lake Meridian Water District
 24,231 1 0
King County Water District #49
 23,492 0 0
Enumclaw Water Department
 23,276 0 0
King County Water District #125
 21,904 1 0
Snoqualmie Water
 20,222 0 0
King County Water District NO 90
 20,100 1 0
Coal Creek Utility District
 15,989 0 0
Skyway Water & Sewer
 12,036 0 0
Duvall City of
 11,050 0 0
NE Sammamish Sewer & Water District
 9,702 0 0
Union Hill Water Association INC
 8,720 0 0
North Bend City of
 8,710 1 0
Pacific City of
 7,925 0 0
Sallal Water Association INC
 6,600 0 0
Black Diamond Water Dept
 6,407 0 0
Snoqualmie Pass Utility District
 5,832 2 1
King County Water District #54
 5,373 0 0
Water District 19
 5,335 2 0
King County Water District 119
 3,800 0 0
Algona Water Dept
 3,300 1 0
Ames Lake Water Assoc INC
 3,224 1 0
Lake Forest Park Water District
 3,171 0 0
Fall City Water Dist. #127
 2,987 1 0
Carnation Water System City of
 2,400 1 0
Cherokee Bay Community Club INC
 2,400 1 0
Mirrormont
 2,083 0 0
Heights Water
 2,051 1 0
Wilderness Rim Association
 1,867 1 0
River Bend HOA
 1,603 0 0
Non-community systems (61: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Port of Seattle/seatac Airport
 49,483 0 0
Stevens Pass Water System
 4,053 1 0
Flaming Geyser State Park
 1,947 0 0
Washington Cathedral
 1,001 0 0
Rogers Group Properties I LLC
 570 1 0
Kanaskat-Palmer State Park
 543 0 0
Federation Forest State Park
 281 0 0
Vashon Island Golf & Country Club
 226 0 0
Cedar Falls Supply
 184 1 0
MUD Mtn Dam Water System
 184 0 0
Carnation Farms
 179 0 0
Bullitt Center
 175 2 0
Denny Creek Campground
 155 0 0
Rainier Christian School
 150 1 1
Tall Chief Resort
 136 0 0
Montessori Spring Valley Supply
 121 1 0
Wsp Fire Training Academy
 113 0 0
Green River Gorge Resort
 104 0 0
Camp Gilead
 95 0 0
Valleyview Christian Church
 88 0 0
Asahel Curtis Picnic Ground East
 80 1 0
Asahel Curtis Picnic Ground West
 80 1 0
Green Bobbie
 80 0 0
Snoqualmie Valley Land Company INC
 80 1 1
Shyne School Water System
 79 1 0
Awareness Water System
 76 0 0
Camp River Ranch
 76 0 0
Soos Creek Salmon Hatchery
 73 0 0
Wabash Pres. Church Supply #1
 71 0 0
Blue Sky RV Park
 68 0 0
Morningside Farm Water System
 65 0 0
Beckler River Campground
 64 0 0
Camp Sealth
 62 1 0
Lions Memorial Youth Camp
 61 0 0
Money Creek Campground
 61 0 0
Tinkham Campground
 57 0 0
Middle Fork Campground #2
 54 0 0
Cedar Grove Composting Water System
 50 2 0
Danner Corp
 50 0 0
Mount SI Motel
 45 0 0
Issaquah Christian Church
 42 0 0
Camp Waskowitz Water System
 41 0 0
Camp Burton Conference Center
 39 0 0
Rio Vista
 36 0 0
Fraternity Snoqualmie
 34 0 0
St. Sava Serbian Orthodox Church
 32 1 0
Boondocks Tavern
 30 0 0
Cedar Grove Water Company
 30 1 0
Cove Beach Water System
 30 1 0
Rainbow Trout Club Homeowners Assoc
 30 0 0
Red Dog Saloon Water System
 30 0 0
Red Fall Quick Stop
 30 0 0
King County Shooting Sports Park
 27 0 0
Miller River Campground
 27 1 0
Cougar Mtn. Park WT Supply Sys.
 25 0 0
Cascade View Rodger Scott Water
 25 1 0
Harbor Heights Water
 25 0 0
Paradise Cove Water System
 17 0 0
Sunwater Beach
 17 1 0
Greenwood Water Association
 12 0 0
Cougar / Squak Corridor
 4 0 0
Inactive systems (302, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Washington records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.