Tapcensus

Water quality in Issaquah, Washington

Issaquah is in King County. 217 active public water systems serve the county; 86 had an EPA violation in the past three years.

Most likely your provider

Issaquah Water System WA5336350 · Community water system · Surface water purchased
Serves 43,584 people Rules violated, past 3 years 0 Distance 0.5 mi

Your location is within the outer bounds of this system's EPA service area.

View system details EPA facility report

Other community water systems in King County

155 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
The Meadows Water System LLC
 127 0 1.0 mi
Edgehill Water Assn
 109 2 1.8 mi
Preston Industrial Park Water Assn
 930 0 3.5 mi
Issaquah Valley Water Assn #1
 80 1 3.8 mi
Sammamish Plateau Water & Sewer
 79,362 0 4.4 mi
King County Water District #117
 95 0 4.5 mi
Four Creeks Ranch Water System
 150 1 4.6 mi
King County Water District NO 90
 20,100 1 4.7 mi
Twenty-Three 800 Tiger Mountain
 129 0 5.0 mi
Coal Creek Utility District
 15,989 0 5.5 mi
King County Water District #123
 242 0 5.8 mi
Alpine Mobile Manor
 45 3 6.3 mi
Mirrormont
 2,083 0 6.3 mi
Bellevue City of
 321,349 0 6.4 mi
Four Lakes
 212 0 6.4 mi
Valley View Mobile Park LLC
 126 0 6.5 mi
Cedar Mountain Homeowners Assoc
 106 1 6.6 mi
NE Sammamish Sewer & Water District
 9,702 0 6.7 mi
Mazama Woods
 45 1 6.7 mi
Lake Alice Water Association
 90 0 6.9 mi
Fall City Water Dist. #127
 2,987 1 7.3 mi
Maplewood Addition Water Coop
 435 0 7.5 mi
Upper Preston Water Assn
 150 0 7.5 mi
Beaux Arts Water Department
 345 1 7.6 mi
Ames Lake Water Assoc INC
 3,224 1 7.8 mi
All 156 community water systems in King County
Non-community systems in King County (61: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Cougar Mtn. Park WT Supply Sys.
 25 0 0
Issaquah Christian Church
 42 0 0
Cougar / Squak Corridor
 4 0 0
Fraternity Snoqualmie
 34 0 0
Green Bobbie
 80 0 0
Cedar Grove Water Company
 30 1 0
St. Sava Serbian Orthodox Church
 32 1 0
Blue Sky RV Park
 68 0 0
Cedar Grove Composting Water System
 50 2 0
Tall Chief Resort
 136 0 0
Red Fall Quick Stop
 30 0 0
Rainier Christian School
 150 1 1
Lions Memorial Youth Camp
 61 0 0
Red Dog Saloon Water System
 30 0 0
Port of Seattle/seatac Airport
 49,483 0 0
Camp River Ranch
 76 0 0
Carnation Farms
 179 0 0
Snoqualmie Valley Land Company INC
 80 1 1
Washington Cathedral
 1,001 0 0
Shyne School Water System
 79 1 0
Rio Vista
 36 0 0
King County Shooting Sports Park
 27 0 0
Valleyview Christian Church
 88 0 0
Mount SI Motel
 45 0 0
Cedar Falls Supply
 184 1 0
Rogers Group Properties I LLC
 570 1 0
Rainbow Trout Club Homeowners Assoc
 30 0 0
Kanaskat-Palmer State Park
 543 0 0
Awareness Water System
 76 0 0
Soos Creek Salmon Hatchery
 73 0 0
Green River Gorge Resort
 104 0 0
Cascade View Rodger Scott Water
 25 1 0
Boondocks Tavern
 30 0 0
Flaming Geyser State Park
 1,947 0 0
Wabash Pres. Church Supply #1
 71 0 0
Vashon Island Golf & Country Club
 226 0 0
Danner Corp
 50 0 0
Camp Burton Conference Center
 39 0 0
Montessori Spring Valley Supply
 121 1 0
Middle Fork Campground #2
 54 0 0
Harbor Heights Water
 25 0 0
Sunwater Beach
 17 1 0
Paradise Cove Water System
 17 0 0
Tinkham Campground
 57 0 0
Camp Sealth
 62 1 0
Morningside Farm Water System
 65 0 0
MUD Mtn Dam Water System
 184 0 0
Asahel Curtis Picnic Ground East
 80 1 0
Asahel Curtis Picnic Ground West
 80 1 0
Denny Creek Campground
 155 0 0
All non-community systems
About this data

Water systems are matched to King County, nearest to Issaquah first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.

Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.

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.