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
Spring Glen Mobile Home Park
 96 0 0
King County Water District #117
 95 0 0
Mountain View Water District INC
 91 2 0
Lake Alice Water Association
 90 0 0
Rakwanna Park Water Sys INC
 90 2 0
Orchard Grove
 86 0 0
Hazelwood Heights
 85 2 0
Sunnyslope Mutual Water System
 85 1 1
Issaquah Valley Water Assn #1
 80 1 0
Crestview Tracts #3
 77 0 0
Remolif Addition
 76 2 0
Lake Wilderness Shore Acres Estate
 75 5 0
Luana Water Assn.
 71 0 0
Quartermaster Heights Water Assn
 70 0 0
Welchs Water Association
 69 1 0
Newaukum Water System
 62 0 0
Stone Creek Estates Water Assn.
 62 1 0
Rocky Acres Water System
 61 0 0
Fall City Water Dist. (plum Creek)
 59 3 0
Alpine Water Association
 58 1 1
Fall City Water Dist.(spring Hill)
 57 1 0
Maple Vista
 57 0 0
85 Acres
 55 0 0
Chamonix Village
 53 3 0
Elderwood Water Association
 52 0 0
Timberlane Village Water
 51 3 1
Forest Grove Hills
 50 0 0
Needle Creek Water System
 50 2 0
Fall City Water Dist. (ruth)
 49 1 0
Norwest Mobile Home Park
 49 0 0
Skyland Park Water Association
 47 1 0
Sawyerwood Estates Water System
 46 0 0
Alpine Mobile Manor
 45 3 0
Mazama Woods
 45 1 0
Green Acres Water Association
 44 1 0
Shawnee Hill Condominium WS
 44 1 0
Evergreen Sky Ranch Community Wtr
 43 2 0
Bridle Trails South Water System
 42 0 0
Logandale Water Assoc Inc.
 42 0 0
Walter Walker Water Works
 42 0 0
New Arcadia Water System
 40 1 0
Wells Water Association
 39 1 1
Lake Retreat Firs #2 Water Assoc.
 38 0 0
Marine Estates Mutual Water Assn
 38 1 1
Noble Woods Water System
 37 0 0
Grotto Water Association
 36 0 0
Reed Ranch Road Water
 36 0 0
Braunwood Estates
 35 0 0
Billington
 34 1 0
Ravensdale Mobile Home Park
 34 2 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.