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 |
|---|---|---|---|---|
|
Gig Harbor Golf & Country Club Pierce County |
114 | 2 | 0 | |
|
Deer Creek Grocery Mason County |
111 | 2 | 0 | |
|
Liberty Cafe Kittitas County |
111 | 1 | 0 | |
|
Camas Meadows Bible Camp Chelan County |
110 | 2 | 0 | |
|
Port of Mattawa Ind Parks 2 & 4 Grant County |
110 | 2 | 0 | |
|
Twin View Estates Community Assoc Island County |
110 | 2 | 0 | |
|
Cascade Peaks Campground Lewis County |
109 | 1 | 0 | |
|
Ellensburg Camp Resort Kittitas County |
109 | 2 | 0 | |
|
Potlatch Beach Mutual Mason County |
109 | 3 | 0 | |
|
Valley Fruit Hilltop Grant County |
108 | 2 | 0 | |
|
Lake Trask Timber Trails Assn Mason County |
107 | 2 | 0 | |
|
Masonic Park Snohomish County |
107 | 2 | 0 | |
|
MC Corkles Market Benton County |
106 | 1 | 0 | |
|
Airport Grocery Mason County |
105 | 2 | 0 | |
|
Bonaparte Lake Resort Okanogan County |
104 | 2 | 0 | |
|
Columbia12 Touchet Chevron Walla Walla County |
104 | 1 | 0 | |
|
Camaloch Assn Pro Shop Island County |
103 | 1 | 0 | |
|
Stevens Pass Nordic Center Chelan County |
103 | 1 | 0 | |
|
Delta Grocery Water System Whatcom County |
102 | 1 | 0 | |
|
Great Basin Water Sunrise Benton County |
100 | 2 | 0 | |
|
Naches Wonderland Campers Assn Yakima County |
100 | 1 | 0 | |
|
Puebla Restaurant Spokane County |
100 | 2 | 0 | |
|
Roi Farm Labor Grant County |
100 | 1 | 0 | |
|
Sand Hollow 1 H2a Grant County |
100 | 1 | 0 | |
|
Whitley #5 Spokane County |
100 | 2 | 0 | |
|
Boast West Farmworker Housing Benton County |
99 | 1 | 0 | |
|
Cornet Bay Heights Water Assn INC Island County |
99 | 3 | 0 | |
|
Sky Meadows Ranch Country Club Wtr Kittitas County |
98 | 1 | 0 | |
|
Weber Farms Orchard Housing #2 Grant County |
98 | 1 | 0 | |
|
Zions Camp Lds Recreational Prop Mason County |
97 | 1 | 0 | |
|
Capstone Farmworker Housing Grant County |
96 | 1 | 0 | |
|
Flat Top Ranch West Bank Housing Franklin County |
96 | 1 | 0 | |
|
May Nursery Twh Benton County |
96 | 1 | 0 | |
|
Monson Fruit Rd 9 H2a Housing Grant County |
96 | 1 | 0 | |
|
Sagemoor Cherry Harvest Camp Franklin County |
96 | 1 | 0 | |
|
Zirkle Finley Ranch Benton County |
96 | 1 | 0 | |
|
Malott Nespelem · County |
95 | 9 | 0 | |
|
MT ST Helens National Volcanic Monu Clark County |
95 | 4 | 0 | |
|
Pheasant Farm Acres Island County |
95 | 3 | 0 | |
|
Marble Water System Stevens County |
94 | 7 | 1 | |
|
Silver Bell Winery Chelan County |
94 | 1 | 0 | |
|
Wildwood 2 and 3 Kittitas County |
93 | 2 | 0 | |
|
Seal Rock Campground Jefferson County |
92 | 1 | 0 | |
|
Fruitland Bible Camp Stevens County |
91 | 2 | 0 | |
|
Pattons Retreat Water Assn Island County |
90 | 4 | 0 | |
|
Rakwanna Park Water Sys INC King County |
90 | 2 | 0 | |
|
Yakima Golding Farms 1 Yakima County |
90 | 3 | 0 | |
|
Key Peninsula Civic Center Assn Pierce County |
86 | 2 | 0 | |
|
Rosario Beach Marine Laboratory Skagit County |
85 | 1 | 0 | |
|
Coulee Flats Dairy Franklin County |
83 | 1 | 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.