Tapcensus

Washington

Thurston County drinking water quality

322 active public water systems serve 397,526 people in Thurston County. 239 are compliant, 83 had at least one EPA violation in the past three years, 0 are designated serious violators, and 1 carries a health flag.

Active systems 322 196 community systems
People served 398K by public water systems
Systems with violations 83 26% of active systems, past 3 years
Serious violators 0 1 systems carry a health flag

Needs attention

Parkwood Apartments WA5318160 · Community water system · Serves 60 1 rule violated in the past three years. Unresolved: Lead and Copper Rule (LCR).

Community water systems

196 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Olympia City of
 126,966 1 0
Lacey Water Department
 105,178 1 0
Tumwater City of
 51,924 0 0
Yelm City of
 17,355 0 0
Tanglewilde Thompson Place 600
 7,900 0 0
Pattison 500
 4,643 0 0
Grand Mound
 3,764 0 0
Tenino City of
 3,336 1 0
Rainier Water Department
 3,103 1 0
Meadows 690
 3,100 0 0
Clearwood
 2,956 0 0
Nisqually Pines Community Club
 2,037 0 0
Rochester
 1,762 0 0
Scott Lake
 1,604 1 0
Evergreen Shores
 1,329 0 0
Carlyon Beach Homeowners
 1,273 2 0
Boston Harbor
 1,153 1 0
Holiday Ranchettes
 1,050 0 0
Sunwood Lakes Homeowners Assoc INC
 925 0 0
Lake Lawrence
 914 0 0
Scenic Shores Water Company
 761 1 0
Cedar Creek Corrections Center
 639 0 0
Bucoda Water Dept
 579 2 1
Foxhall
 549 0 0
Rolling Firs Evergreen Terrace
 514 0 0
Silver Hawk
 499 0 0
Countrywood Estates 680
 488 0 0
Classic Heights
 480 0 0
Black Lake Bible Camp & Conf Ctr
 477 1 0
Maple Lane Behavioral Health
 450 3 0
Hawley Hills 686
 425 0 0
Henderson Boulevard
 418 0 0
Delphi
 381 0 0
Alpine Hills
 363 0 0
Lake Lucinda Community Club
 360 0 0
Nisqually Sportsmens Club
 341 1 0
Washington Land Yacht Harbor
 340 0 0
Black Lake Estates
 329 0 0
Hawk Acres 607
 328 0 0
Lost Lake
 328 0 0
Pleasant Forest Camping Club
 327 1 0
Andrews First
 299 0 0
Butler Cove Water Company
 278 0 0
River Park
 277 0 0
Keanland Park 761
 268 0 0
Scatter Creek Ranch 760
 268 0 0
Lazy Acres 351
 267 0 0
Tamoshan
 260 1 0
Prairie Ridge 605
 250 1 0
Field of Dreams
 247 0 0
Non-community systems (126: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Millersylvania State Park
 3,456 1 0
Maytown Rest Area
 3,134 0 0
Scatter Creek Rest Area
 1,858 1 0
Rochester High School
 1,275 0 0
Schilter Family Farm Store
 1,056 0 0
Nisqually Commercial Park
 940 1 0
Tolmie State Park
 683 0 0
Griffin School
 672 1 0
South Sound Speedway
 654 0 0
South Bay Elementary School
 615 1 0
East Olympia Elementary School
 593 0 0
Southworth Elementary
 550 1 0
Zebras Aqueous Substance
 526 0 0
Spar Restaurant
 474 1 0
Littlerock Elementary
 463 0 0
Villa Grove
 442 0 0
Lackamas Elementary School
 330 0 0
Steamboat Square
 310 1 0
Sunshine
 309 0 0
Cattlemens Livestock Exchange
 306 0 0
Theodore Hoss Sports Complex
 304 1 0
Littlerock Grocery
 303 0 0
Gull Harbor Mercantile INC
 299 0 0
Farm Boy Drive in
 285 0 0
Stewarts Meats
 272 0 0
Eason Dan B
 254 0 0
South Bay Market and Deli
 253 1 0
Nisqually Valley Moose 1905
 250 1 0
Rochester Mennonite Church
 220 0 0
Speedway Grocery
 220 1 0
South Bay Utility LLC
 220 0 0
Olympia Artesian Well City of
 214 0 0
Duerr Steamboat Annies
 207 0 0
Black Lake Grocery
 203 0 0
Johnson Glen
 200 0 0
Nisqually National Wildlife Refuge
 200 0 0
ST Michael Parish
 200 0 0
Tilley Maintenance Facility
 200 0 0
Djs Country Market INC
 187 0 0
Black Lake Water CO LLC
 174 0 0
Seventh Day Adventist School Yelm
 146 0 0
First Baptist Church of Tenino
 140 0 0
American Heritage Campgrounds
 135 0 0
Middle Waddell Campground
 135 1 0
Ranch House Bbq
 135 2 0
Camp Thunderbird Boy Scouts
 134 1 0
Cascades Camp & Conference Center
 131 1 0
Olympia Campground
 130 0 0
Steamboat Island Fuel
 126 0 0
Littlerock Community Fellowship
 125 0 0
New Life Christian Center
 120 1 1
Outback RV Park
 114 1 0
South Bay
 114 0 0
Steamboat Island Athletic Club
 107 0 0
Maverick 1
 106 0 0
Buzzs Bar & Grill
 105 1 0
Pacific Mini Mart
 104 0 0
McKenny Camp
 102 1 0
Frye Cove Park
 100 1 0
Mobbs Water
 100 0 0
Odd Fellows Puget Beach Park
 100 0 0
Ostrom Mushroom Farms
 100 0 0
Crossroads Community Church
 95 0 0
Weyerhaeuser Forestry Nursery
 92 0 0
Orv Sports Park
 90 0 0
South Bay Grange No. 250
 89 1 0
Weyerhaeuser Vail Shop
 86 0 0
Orv Lower Campground
 83 0 0
Lincoln Creek Lumber CO
 75 0 0
Olympia Bible
 75 1 0
Medicine Creek Winery
 74 1 0
Stewarts Arena
 74 1 0
Zittels Marina
 74 1 0
Northwest Natural
 70 2 0
Old Dominion
 70 0 0
Littlerock Water Works INC
 67 1 0
Bradley Denny
 66 1 0
Evergreen Sportsmens Club
 64 0 0
Lattins Country Cider Mill & Farm
 61 1 0
Wolf Haven Water Supply
 60 1 0
Youngs
 60 0 0
Zebisrael
 60 1 0
Lawyer Nursery INC
 58 0 0
McKenzie Road Baptist Church
 57 0 0
Blue Heron
 56 0 0
Loud Ministries International
 55 0 0
Junction Bar and Grill
 54 0 0
Vail Road Convenience Store
 54 0 0
West Olympia Medical Park
 52 0 0
Yelm Eagles
 52 0 0
Ch2o
 51 0 0
Four Corners Store
 51 0 0
Jones Industrial Park
 50 2 0
Yelm Kingdom Hall
 50 0 0
Blessed Hope
 45 1 0
Hansen
 44 0 0
Lds Church (recreation Area)
 44 0 0
Maytown Truck Stop
 44 0 0
Chabad Jewish Discovery Center
 43 2 0
Kaiser Industrial Park
 43 0 0
All 126 in the systems table
Inactive systems (388, 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.