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 |
|---|---|---|---|---|
|
Freeland Water and Sewer District Island County |
1,264 | 2 | 0 | |
|
Hatton Coulee Rest Area Adams County |
1,255 | 1 | 0 | |
|
Weiler-Martin Tracts Water Assn Grant County |
1,163 | 2 | 0 | |
|
Pateros Water Department Okanogan County |
1,149 | 1 | 0 | |
|
Wilkeson Water Department Pierce County |
1,071 | 2 | 0 | |
|
George City of Grant County |
1,035 | 2 | 0 | |
|
Allan Bros Warehouse Yakima County |
1,000 | 2 | 0 | |
|
Sunserra at Crescent Bar Grant County |
1,000 | 2 | 0 | |
|
Finley School District #53 Benton County |
990 | 4 | 0 | |
|
Odessa Lincoln County |
986 | 5 | 0 | |
|
Alder Lake Park Water System Pierce County |
934 | 1 | 0 | |
|
Roosevelt Park Klickitat County |
899 | 1 | 0 | |
|
Potholes General Store Grant County |
877 | 2 | 0 | |
|
Rolling Hills-Glencairn Island County |
872 | 4 | 0 | |
|
Okanogan County Fair Water System Okanogan County |
867 | 2 | 0 | |
|
Hangman Hills Water Dist 15 Spokane County |
827 | 3 | 0 | |
|
Hillcrest Village Water CO INC Island County |
770 | 1 | 0 | |
|
Heritage University Water System Toppenish · County |
750 | 5 | 1 | |
|
Memorial Bible Church Yakima County |
736 | 2 | 0 | |
|
Skagit Speedways Skagit County |
736 | 2 | 0 | |
|
Palouse Empire Fairgrounds Whitman County |
733 | 1 | 0 | |
|
Oak Park Mason County |
695 | 1 | 0 | |
|
Chehalis Tribal Housing Oakville · County |
620 | 7 | 0 | |
|
South Bay Elementary School Thurston County |
615 | 1 | 0 | |
|
Jefferson County Water Dist #1 Jefferson County |
600 | 4 | 0 | |
|
McKenna Water District Pierce County |
600 | 2 | 0 | |
|
Camano Vista Water District Island County |
591 | 1 | 0 | |
|
New Testament Christian Church Pierce County |
581 | 1 | 0 | |
|
Rogers Group Properties I LLC King County |
570 | 1 | 0 | |
|
Sprague City of Lincoln County |
570 | 5 | 1 | |
|
Silver Lake Park Main Campground Whatcom County |
553 | 1 | 0 | |
|
Bluewood Ski Area Columbia County |
532 | 1 | 0 | |
|
Adams County Fair Adams County |
503 | 2 | 0 | |
|
Northwood Casino Lynden · County |
500 | 5 | 0 | |
|
Mesa Water Department Franklin County |
495 | 1 | 0 | |
|
Liberty School District #362 Spokane County |
486 | 1 | 0 | |
|
Wynoochee Wildwood Park Grays Harbor County |
471 | 1 | 0 | |
|
Panorama Point Campground Whatcom County |
450 | 1 | 0 | |
|
Nespelem Agency Nespelem · County |
445 | 9 | 0 | |
|
Pioneer Water Company Spokane County |
443 | 4 | 0 | |
|
Four Lakes Water District 10 Spokane County |
433 | 1 | 0 | |
|
Riverside Town of Okanogan County |
429 | 5 | 1 | |
|
Whidbey West Water Assoc. Island County |
415 | 3 | 0 | |
|
Deming Log Show & RV Whatcom County |
407 | 2 | 0 | |
|
Vantage Water System Kittitas County |
405 | 1 | 0 | |
|
Grandview-Northgate Industrial Park Whatcom County |
400 | 1 | 0 | |
|
Nooksack Market Deming · County |
400 | 5 | 0 | |
|
Omak Hud Nespelem · County |
380 | 9 | 0 | |
|
Cuyamaca Olympia · County |
375 | 7 | 0 | |
|
Quinault River Inn Lake Quinault · County |
370 | 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.