Nitrate violations in Washington
452 active public water systems in Washington had a Nitrate violation in the past three years, 15 of them in the latest quarter of EPA's data. What Nitrate is and why it matters.
Systems with a Nitrate violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Pine Grove Mennonite Church Stevens County |
83 | 1 | 0 | |
|
Lofall Water System INC Kitsap County |
81 | 4 | 0 | |
|
Asahel Curtis Picnic Ground East King County |
80 | 1 | 0 | |
|
Asahel Curtis Picnic Ground West King County |
80 | 1 | 0 | |
|
Cedar Creek Sda Church Clark County |
80 | 1 | 0 | |
|
Sauk-Suiattle Darrington · County |
80 | 7 | 3 | |
|
G&g Orchard Yakima County |
78 | 2 | 0 | |
|
South Whidbey P&r Sports Complex Island County |
78 | 2 | 0 | |
|
Western Airpark Thurston County |
78 | 1 | 0 | |
|
Winthrop KOA Okanogan County |
77 | 2 | 0 | |
|
Bybee Clyde W. Benton County |
76 | 1 | 0 | |
|
Remolif Addition King County |
76 | 2 | 0 | |
|
Sit N Bull Saloon Okanogan County |
76 | 1 | 0 | |
|
Arlington View Estates Water Assoc Snohomish County |
75 | 1 | 0 | |
|
Camano Lutheran Church Island County |
75 | 1 | 0 | |
|
Dalkena Community Church Pend Oreille County |
75 | 2 | 0 | |
|
Camp Fife Yakima County |
75 | 2 | 0 | |
|
Lake Wilderness Shore Acres Estate King County |
75 | 5 | 0 | |
|
Ridgeview Estates Community Assn. Island County |
75 | 3 | 0 | |
|
Thunderbird Terrace Water System Snohomish County |
75 | 2 | 0 | |
|
Tillicum Beach Assn Island County |
75 | 1 | 0 | |
|
Davis Landing Water System Island County |
74 | 3 | 0 | |
|
Stewarts Arena Thurston County |
74 | 1 | 0 | |
|
Madrona Park Mason County |
73 | 1 | 0 | |
|
Steamboat Island INC Thurston County |
73 | 1 | 0 | |
|
Dryden Independent Plaza & RV Chelan County |
72 | 1 | 0 | |
|
Lakeside Bible Camp Island County |
72 | 1 | 0 | |
|
Loge Alta Crystal Pierce County |
72 | 2 | 0 | |
|
Silver Beach Resort Yakima County |
72 | 2 | 0 | |
|
Ncsb Okanogan County |
71 | 1 | 0 | |
|
Prince of Peace Catholic Church Mason County |
71 | 2 | 0 | |
|
Northwest Natural Thurston County |
70 | 2 | 0 | |
|
Painted Hills Water Association Grant County |
70 | 3 | 0 | |
|
Riggleman Orchards INC Klickitat County |
70 | 2 | 0 | |
|
Cyo Camp Hamilton Snohomish County |
69 | 2 | 0 | |
|
Tel Company 4 Island County |
69 | 1 | 0 | |
|
Bertelsen Winery Water System Skagit County |
67 | 2 | 0 | |
|
Big Wallys Grant County |
67 | 1 | 0 | |
|
Horseshoe Lake County Park Kitsap County |
67 | 1 | 0 | |
|
Brown Creek Campground HP B Mason County |
65 | 1 | 0 | |
|
Dancing Fish Farm Island County |
65 | 2 | 0 | |
|
Lakeview Heights HOA Lincoln County |
65 | 1 | 0 | |
|
Noors Paradise Market Whatcom County |
65 | 2 | 0 | |
|
Whitstran Heights Water Association Benton County |
65 | 2 | 0 | |
|
Willow Drive Nursery Warehouse Off. Grant County |
65 | 2 | 0 | |
|
Buckingham Water System Okanogan County |
64 | 2 | 1 | |
|
Coulee Lodge Resort Grant County |
64 | 2 | 0 | |
|
Deer Harbor Inn San Juan County |
64 | 1 | 0 | |
|
Jarrells Cove Marina Mason County |
64 | 1 | 0 | |
|
Oroville Golf Club Okanogan County |
64 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Nitrate, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Nitrate alone.
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.