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 |
|---|---|---|---|---|
|
Chewelah Water Dept North Stevens County |
350 | 2 | 0 | |
|
Greenwood Mobile Home Park Grays Harbor County |
350 | 2 | 0 | |
|
Loup Loup Ski Area Okanogan County |
350 | 1 | 0 | |
|
Winchester Mobile Homes Water Pierce County |
350 | 3 | 1 | |
|
Smokiam RV Resort Grant County |
343 | 2 | 0 | |
|
Keller Mallott · County |
340 | 10 | 0 | |
|
Ringold Domestic Water Corp Franklin County |
340 | 3 | 0 | |
|
Beaver Valley General Store Jefferson County |
335 | 2 | 0 | |
|
Blakely Is. Maintenance Commission San Juan County |
333 | 2 | 0 | |
|
Kalispel Usk · County |
330 | 7 | 0 | |
|
Campbell Farm Wapato · County |
320 | 3 | 1 | |
|
West Mesa Domestic Water Assn Franklin County |
316 | 2 | 0 | |
|
Huff and Puff Drive in Lewis County |
313 | 1 | 0 | |
|
Stratford Road Estates Grant County |
312 | 2 | 0 | |
|
Steamboat Square Thurston County |
310 | 1 | 0 | |
|
Kens Korner Island County |
300 | 2 | 0 | |
|
Oalc Davenport Lincoln County |
300 | 1 | 0 | |
|
Stanwood Deli & Gas Snohomish County |
299 | 1 | 0 | |
|
Lacrosse Town of Whitman County |
297 | 2 | 0 | |
|
Kings Way Foursquare Clallam County |
296 | 1 | 0 | |
|
Midway Mini-Mart Grant County |
293 | 1 | 0 | |
|
Hunters Water District Stevens County |
290 | 5 | 1 | |
|
Northport Water System Stevens County |
290 | 1 | 0 | |
|
Camp Nor Wester San Juan County |
281 | 1 | 0 | |
|
Whitstran Elementary School Benton County |
280 | 1 | 0 | |
|
Perry Lewis County |
277 | 4 | 1 | |
|
Rocky River Road Community Site Nespelem · County |
260 | 8 | 0 | |
|
Cypress Country Estates Franklin County |
253 | 1 | 0 | |
|
Percie Road Water Association Whatcom County |
250 | 3 | 0 | |
|
Road Warrior Wapato · County |
250 | 4 | 1 | |
|
Summerset West Water Association Adams County |
240 | 4 | 0 | |
|
River Rue Lincoln County |
237 | 2 | 0 | |
|
Holden Village Chelan County |
228 | 3 | 0 | |
|
Paschal Sherman Indian School Omak · County |
220 | 7 | 0 | |
|
Smwe Columbia Crest Winery Benton County |
218 | 1 | 0 | |
|
Trails End Water District Mason County |
211 | 6 | 0 | |
|
Steptoe Water/sewer District Whitman County |
210 | 2 | 0 | |
|
Stillaguamish Village Mount Vernon · County |
210 | 6 | 1 | |
|
Blue Fox Drive in Island County |
208 | 1 | 0 | |
|
Mullen Hill Terrace MHP Spokane County |
207 | 5 | 0 | |
|
Blue Earth Farms Lewis County |
204 | 1 | 0 | |
|
Normanna Park Inc. Snohomish County |
202 | 2 | 0 | |
|
Buena Vista Community Club Island County |
200 | 1 | 0 | |
|
Fields Point Chelan RD Chelan County |
200 | 2 | 0 | |
|
Laestadian Lutheran Church Cowlitz County |
200 | 1 | 0 | |
|
Maple Glen Community Association Island County |
200 | 1 | 0 | |
|
Yak CO Crewport Yakima County |
192 | 2 | 0 | |
|
Pineloch Sun Beach Club Kittitas County |
190 | 2 | 0 | |
|
Sun Harbor SW Walla Walla County |
188 | 1 | 0 | |
|
Willeys Lake Terrace Water Assn Whatcom County |
180 | 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.