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 |
|---|---|---|---|---|
|
Cedar Grove Water Company King County |
30 | 1 | 0 | |
|
Jafbro 2 Mason County |
30 | 2 | 0 | |
|
Norway Pass Trailhead HP Skamania County |
30 | 2 | 0 | |
|
Panther Campground HP NO 1 Skamania County |
30 | 1 | 0 | |
|
Rest a While RV Park Mason County |
30 | 2 | 0 | |
|
Tiger Mtn Tracts King County |
30 | 4 | 1 | |
|
Www 3 Chelan County |
30 | 2 | 0 | |
|
Happy Hollow Grocery Mason County |
29 | 2 | 0 | |
|
Tacoma Sportsmen S Club Inc. Pierce County |
29 | 1 | 0 | |
|
Faranda Water Associaton Island County |
28 | 6 | 1 | |
|
Mineral Lake Resort Lewis County |
28 | 2 | 0 | |
|
North Kitsap Eagles #3586 Kitsap County |
28 | 2 | 0 | |
|
Park 400 Association Grays Harbor County |
28 | 2 | 0 | |
|
Possibility Orchards Chelan County |
28 | 2 | 0 | |
|
Queen Anne Water Works LLC Mason County |
28 | 1 | 0 | |
|
Silver Dollar Cafe Yakima County |
27 | 2 | 0 | |
|
Bruceport County Park Pacific County |
27 | 2 | 0 | |
|
Kaniksu Ranch Water System Stevens County |
27 | 1 | 0 | |
|
Trails West Subdivision Stevens County |
27 | 7 | 1 | |
|
Coopers Cafe Chelan County |
26 | 2 | 0 | |
|
Driftwood Acres Grays Harbor County |
26 | 2 | 0 | |
|
Greenwater Water System Pierce County |
26 | 1 | 0 | |
|
Foothills Mission Church Spokane County |
25 | 2 | 0 | |
|
Liberty Market Water Supply Island County |
25 | 1 | 0 | |
|
Liebert Property Yakima County |
25 | 2 | 0 | |
|
Red Gate Mobile Home Park Pierce County |
25 | 5 | 0 | |
|
Satsop Work Center Grays Harbor County |
25 | 1 | 0 | |
|
Silver Lake Park Horse Camp Whatcom County |
25 | 1 | 0 | |
|
Tradewinds Mutual Services Pacific County |
25 | 1 | 0 | |
|
Twin Pines Mobile Home Park Okanogan County |
25 | 7 | 1 | |
|
Whispering Cedars Deming · County |
25 | 5 | 0 | |
|
Wilderness Northwest Jefferson County |
25 | 2 | 0 | |
|
Winlock Waters 2 Lewis County |
25 | 4 | 0 | |
|
Cliffside Water System Island County |
24 | 1 | 0 | |
|
Merry Etta Park Cowlitz County |
24 | 2 | 0 | |
|
East North Beach Comm Water Assn Skagit County |
23 | 1 | 0 | |
|
Sun Cove Water System Okanogan County |
23 | 2 | 0 | |
|
Curlew Lake Heights Water System Ferry County |
22 | 1 | 0 | |
|
Sagedale Apartments Grant County |
21 | 3 | 0 | |
|
Honeymoon Bay Vista Island County |
19 | 1 | 0 | |
|
Ketron Island Water INC Pierce County |
17 | 2 | 0 | |
|
Bonaparte Lake Campground-Well 4 Okanogan County |
15 | 2 | 0 | |
|
Davis Head HOA San Juan County |
13 | 1 | 0 | |
|
Rimrock Meadows Douglas County |
13 | 1 | 0 | |
|
Summertide Mason County |
11 | 2 | 0 | |
|
Cowlitz Valley Wildlife League Cowlitz County |
10 | 1 | 0 | |
|
Sun Cove Resort Spokane County |
10 | 2 | 0 | |
|
Skagit River RV & Camping Skagit County |
10 | 2 | 0 | |
|
Bakers Pond Water Users Corp Garfield County |
9 | 2 | 0 | |
|
Ski Tur Valley Kittitas County |
9 | 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.