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
Dockton Water Association
 992 0 0
Burton Water Cooperative
 964 1 1
Preston Industrial Park Water Assn
 930 0 0
Grandview Condominiums
 679 2 0
Westside Water Assn
 562 1 1
Sugarloaf Water System
 468 0 0
Maplewood Addition Water Coop
 435 0 0
Echo Glen Childrens Center
 430 1 0
Lake Margaret Water System
 406 2 0
Lake Retreat Camp & Conf Center
 404 1 0
Gold Beach Water Company
 390 1 0
Ravensdale Water Supply
 389 1 0
Beaux Arts Water Department
 345 1 0
Riverbend Mobile Home Park
 343 0 0
Skykomish Water Dept
 324 0 0
Highlands Utility District
 275 0 0
Spring Glen Association
 273 0 0
Foothills Water Association
 271 0 0
Walczak 620
 256 0 0
King County Water District #123
 242 0 0
Maury Mutual Water CO
 233 2 1
Cristalina
 225 0 0
Four Lakes
 212 0 0
South Auburn Water Association
 212 0 0
Cumberland Coop Water System
 210 0 0
Auburn Park Community LLC
 202 0 0
Mount SI Mobile Home Estates
 200 2 0
Locloman Subdivision
 174 1 0
Dawnbreaker Water Association
 168 1 0
Derbyshire Scenic Acres
 156 0 0
Lake Meridian Estates (mhp)
 154 1 0
Evergreen Water & Improvement Assn
 150 1 0
Four Creeks Ranch Water System
 150 1 0
Upper Preston Water Assn
 150 0 0
Crestview West Water System
 147 3 0
Lake Tuck
 143 0 0
Cherry Creek
 138 1 0
Diamond Springs Water Association
 138 0 0
Mariani Water System INC
 138 0 0
Twenty-Three 800 Tiger Mountain
 129 0 0
The Meadows Water System LLC
 127 0 0
Valley View Mobile Park LLC
 126 0 0
Trails End
 117 0 0
Edgehill Water Assn
 109 2 0
Riverwood Park Community Club
 109 1 0
Woodland Heights
 108 0 0
Beulah Park Community
 106 0 0
Cedar Mountain Homeowners Assoc
 106 1 0
Rumbolz Sunset Water System
 106 2 0
Echo Glen Water System
 105 3 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.