Tapcensus

Water quality for ZIP code 98040

ZIP 98040 covers Mercer Island in King County, Washington, one of 86 ZIP codes in the county. 217 active public water systems serve the county; 86 had an EPA violation in the past three years.

Most likely your provider

Mercer Island City of WA5353640 · Community water system · Surface water purchased
Serves 31,057 people Rules violated, past 3 years 0 Last sanitary survey Oct 22, 2024 Distance 0.2 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
Beaux Arts Water Department
 345 1 2.0 mi
Coal Creek Utility District
 15,989 0 3.4 mi
King County Water District #117
 95 0 4.1 mi
Bellevue City of
 321,349 0 4.3 mi
Skyway Water & Sewer
 12,036 0 4.7 mi
Grandview Condominiums
 679 2 5.7 mi
Trails End
 117 0 5.9 mi
Renton City of
 108,091 0 6.0 mi
Seattle Public Utilities
 1,161,961 0 6.4 mi
King County Water District #20
 48,469 0 6.6 mi
Tukwila Water Department
 36,298 0 6.7 mi
Edgehill Water Assn
 109 2 6.8 mi
King County Water District #125
 21,904 1 6.9 mi
Maplewood Addition Water Coop
 435 0 7.3 mi
Kirkland City of
 69,243 0 8.2 mi
King County Water District NO 90
 20,100 1 8.2 mi
Valley View Mobile Park LLC
 126 0 8.7 mi
Issaquah Water System
 43,584 0 8.9 mi
King County Water District #49
 23,492 0 8.9 mi
The Meadows Water System LLC
 127 0 9.3 mi
NE Sammamish Sewer & Water District
 9,702 0 9.7 mi
Soos Creek Water & Sewer District
 74,172 0 10.1 mi
Redmond Water System City of
 163,335 0 10.1 mi
Sammamish Plateau Water & Sewer
 79,362 0 10.6 mi
Mountain View Water District INC
 91 2 10.6 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
Cougar / Squak Corridor
 4 0 0
Rainier Christian School
 150 1 1
Issaquah Christian Church
 42 0 0
Cedar Grove Composting Water System
 50 2 0
Washington Cathedral
 1,001 0 0
Fraternity Snoqualmie
 34 0 0
Cedar Grove Water Company
 30 1 0
Green Bobbie
 80 0 0
Red Fall Quick Stop
 30 0 0
St. Sava Serbian Orthodox Church
 32 1 0
Red Dog Saloon Water System
 30 0 0
Lions Memorial Youth Camp
 61 0 0
Shyne School Water System
 79 1 0
Valleyview Christian Church
 88 0 0
Tall Chief Resort
 136 0 0
Blue Sky RV Park
 68 0 0
Carnation Farms
 179 0 0
Vashon Island Golf & Country Club
 226 0 0
Camp Burton Conference Center
 39 0 0
Camp River Ranch
 76 0 0
Port of Seattle/seatac Airport
 49,483 0 0
Soos Creek Salmon Hatchery
 73 0 0
Harbor Heights Water
 25 0 0
Sunwater Beach
 17 1 0
Paradise Cove Water System
 17 0 0
Rio Vista
 36 0 0
Camp Sealth
 62 1 0
King County Shooting Sports Park
 27 0 0
Morningside Farm Water System
 65 0 0
Cascade View Rodger Scott Water
 25 1 0
Snoqualmie Valley Land Company INC
 80 1 1
Montessori Spring Valley Supply
 121 1 0
Danner Corp
 50 0 0
Awareness Water System
 76 0 0
Boondocks Tavern
 30 0 0
Flaming Geyser State Park
 1,947 0 0
Wabash Pres. Church Supply #1
 71 0 0
Green River Gorge Resort
 104 0 0
Mount SI Motel
 45 0 0
Rainbow Trout Club Homeowners Assoc
 30 0 0
Kanaskat-Palmer State Park
 543 0 0
Cedar Falls Supply
 184 1 0
Rogers Group Properties I LLC
 570 1 0
Middle Fork Campground #2
 54 0 0
MUD Mtn Dam Water System
 184 0 0
Tinkham Campground
 57 0 0
Asahel Curtis Picnic Ground East
 80 1 0
Asahel Curtis Picnic Ground West
 80 1 0
Federation Forest State Park
 281 0 0
All non-community systems
About this data

Water systems are matched to King County, the county this ZIP code lies in, nearest to the ZIP code's centre 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.

ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA 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.