Tapcensus

Washington

Okanogan County drinking water quality

123 active public water systems serve 45,838 people in Okanogan County. 77 are compliant, 46 had at least one EPA violation in the past three years, 2 are designated serious violators, and 0 carry a health flag.

Active systems 123 43 community systems
People served 46K by public water systems
Systems with violations 46 37% of active systems, past 3 years
Serious violators 2 0 systems carry a health flag

Needs attention

Riverside Town of WA5372850 · Community water system · Serves 429 5 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR).
Alamo Orchard CO Pateros WA5307278 · Transient non-community system · Serves 48 2 rules violated in the past three years. Unresolved: Nitrate.

Community water systems

43 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Omak City of
 4,940 0 0
Brewster City of
 3,843 1 0
Okanogan Water Department City of
 3,817 1 0
Oroville City of
 3,256 0 0
Tonasket Water System
 2,398 0 0
Coulee Dam Water Dept
 1,454 0 0
Winthrop Town of
 1,350 4 0
Twisp Town of
 1,173 0 0
Monse-Riggan Camp
 1,165 4 1
Pateros Water Department
 1,149 1 0
Jaw Farms INC
 636 0 0
Duck Lake Water Association
 635 0 0
Brewster Flat Domestic Water Assn
 542 0 0
Nespelem Water Dept
 510 0 0
P and G Orchards Camp 2
 489 1 0
Riverside Town of
 429 5 1
Elmer City Water System
 368 2 0
Progressive Flat Water Assn
 335 0 0
Sandflat Water Association
 260 0 0
Suncrest Plat Water System
 260 0 0
Coleman Butte Water Assn
 250 0 0
Loomis Water Users Assn INC
 225 0 0
Alta Lake Golf Course Plat
 161 0 0
River Road Mobile Home Park
 150 1 0
Aston Estates
 141 0 0
Crumbacher Estates Water System
 111 0 0
Homestead Mobile Home Park
 105 0 0
M J Trailer Ranch
 100 0 0
Edelweiss Maintenance Commission
 95 2 1
Pine Forest Water System
 90 0 0
Old Orchard Estates Water System
 86 0 0
Lost River Airport Association
 76 0 0
Wolf Creek Property Owners Assn
 71 1 0
Pinecrest Subdivison Owners
 63 0 0
Emanuel Heights Water System
 60 2 0
Vista Vue Water Users Assn
 60 0 0
Appleway Trailer Court
 54 0 0
Hi-Color Orchard Farmworker Housing
 53 1 0
Johnson Creek Water Users Assn
 48 0 0
Methow Water System INC
 45 0 0
Many Lakes Mobile Home Park
 37 2 0
Valley View Estates Water System
 28 0 0
Twin Pines Mobile Home Park
 25 7 1
Non-community systems (80: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Pearrygin Lake State Park Both CG
 2,103 1 0
Okanogan Neighbors
 1,600 0 0
Alta Lake State Park
 1,071 0 0
Conconully State Park
 1,004 0 0
Johns Farms
 872 0 0
Okanogan County Fair Water System
 867 2 0
Liberty Bell High School
 642 0 0
Bridgeport State Park
 441 0 0
Washington Pass Well Methow RD
 413 0 0
Sun Mountain Resort
 376 2 0
Loup Loup Ski Area
 350 1 0
Conconully City Well
 299 0 0
Conconully SP Boat Launch
 258 0 0
Riverbend RV Park
 222 0 0
Los Reyes Inc
 200 0 0
Honeybear Growers
 161 0 0
Emerald City Green Machine
 155 0 0
Country River Farm
 153 1 0
P and G Orchards Camp 3
 152 0 0
Klipchuck CG Methow RD
 149 1 0
Arrowhead Ranch
 140 0 0
Conconully SP Primitive Area
 129 0 0
Pasayten Peak
 129 1 0
Tonasket Free Methodist Church
 120 0 0
Mazama Store
 109 1 0
Bonaparte Lake Resort
 104 2 0
Buckhorn Mountain Water System
 100 0 0
Red Rock Saloon
 100 0 0
Hardin Housing Water System
 83 0 0
Wilson Ranch PD Water System
 82 0 0
Dons Fruit Stand
 77 0 0
Winthrop KOA
 77 2 0
Sit N Bull Saloon
 76 1 0
Liars Cove
 73 1 0
Conconully Bible Camp
 71 1 0
Ncsb
 71 1 0
Gamble Sands
 70 0 0
Wagon Wheels Cafe
 69 0 0
Bear Creek Golf Course
 68 1 0
Gold Digger Orchards (north Co.) #2
 66 0 0
Keystone Ranch
 66 0 0
Buckingham Water System
 64 2 1
Oroville Golf Club
 64 2 0
Shady Pines Resort
 62 0 0
Whitestone Pears
 62 2 0
Custom Orchard 1
 60 0 0
Our Lady of Valley Catholic Church
 60 2 0
Early Winters WC Methow RD
 54 1 0
Poirier Orchard
 50 0 0
Palmer Lake Land Company
 49 0 0
Alamo Orchard CO Pateros
 48 2 0
Highland Fire Camp
 47 0 0
Rader Road HOA
 44 0 0
Indian Camp Buckhorn MT Orchard
 43 0 0
JN Camp Buckhorn MT Orchards
 41 1 0
Smith & Nelson
 36 0 0
Casia Lodge & Ranch
 35 2 0
Spectacle Lake Resort
 35 1 0
Lost Lake Campgound
 32 2 0
Mazama Water Association
 31 0 0
Omak Omk City of
 31 0 0
Wesola Polana
 31 1 0
Aeneas General Store
 30 0 0
Roadway Stores INC
 27 0 0
Silverline Resort
 26 1 0
Wagon Wheel Bar & Grill
 26 1 0
Davis Lake Water System
 25 0 0
The Inn at Mazama
 25 0 0
Jacks RV Park 1
 24 0 0
Sun Cove Water System
 23 2 0
Lazy Daze Water Association
 21 0 0
Twisp River Sky Ranch Water System
 21 0 0
Early Winters Cabins
 17 0 0
Oro Beach RV Resort
 17 1 0
Bonaparte Lake Campground-Well 4
 15 2 0
Liberty Woodlands
 14 0 0
OK Ranch INC
 13 0 0
Molson Water Users
 12 0 0
Conconully Lake Resort
 10 0 0
Sonora Point Resort
 2 0 0
Inactive systems (163, 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.