Nitrate violations in Oregon
363 active public water systems in Oregon had a Nitrate violation in the past three years, 1 of them still unresolved. What Nitrate is and why it matters.
Systems with a Nitrate violation
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Golf MHP Malheur County |
60 | 6 | 1 | |
|
Hermiston, City of Umatilla County |
20,000 | 2 | 0 | |
|
Prineville, City of Crook County |
11,000 | 5 | 1 | |
|
Molalla, City of Clackamas County |
10,298 | 2 | 0 | |
|
Warm Springs Water Treatment Plant Warm Springs · County |
3,800 | 16 | 5 | |
|
Harrisburg, City of Linn County |
3,684 | 5 | 1 | |
|
Gold Beach, City of Curry County |
3,000 | 5 | 0 | |
|
SW Lincoln CO Water Pud Lincoln County |
3,000 | 7 | 0 | |
|
Luckiamute Domestic Water Coop Polk County |
2,738 | 6 | 0 | |
|
Youngs River Lewis & Clark WD Clatsop County |
2,580 | 7 | 0 | |
|
Lakeview, Town of Lake County |
2,476 | 10 | 2 | |
|
Enterprise, City of Wallowa County |
2,107 | 3 | 0 | |
|
City of Rainier Columbia County |
1,932 | 8 | 0 | |
|
Fairview Water District Tillamook County |
1,930 | 5 | 1 | |
|
Brownsville, City of Linn County |
1,906 | 6 | 0 | |
|
Canyonville, City of Douglas County |
1,662 | 6 | 0 | |
|
Rickreall Water Association Polk County |
1,650 | 6 | 0 | |
|
Hines Water Department Harney County |
1,645 | 3 | 0 | |
|
Port of Morrow Morrow County |
1,350 | 4 | 0 | |
|
Island City Union County |
1,166 | 5 | 2 | |
|
Yachats, City of Lincoln County |
1,006 | 7 | 1 | |
|
Rainier SD #13 Columbia County |
950 | 3 | 0 | |
|
Garibaldi Water System Tillamook County |
837 | 4 | 1 | |
|
Usace Cottage Grove Lane County |
750 | 3 | 0 | |
|
Chiloquin Municipal Water Dept Klamath County |
730 | 4 | 1 | |
|
Pleasant Valley Elementary Multnomah County |
650 | 2 | 0 | |
|
Short Stop #1 Umatilla County |
650 | 3 | 1 | |
|
Mapleton Water District Lane County |
600 | 8 | 0 | |
|
Falcon Heights Klamath County |
559 | 4 | 1 | |
|
Meriwether Natl Golf Course Washington County |
516 | 3 | 0 | |
|
Lamb Weston Umatilla County |
500 | 3 | 1 | |
|
Meadowbrook Grocery Clackamas County |
500 | 3 | 0 | |
|
North Plains Arco Washington County |
500 | 1 | 0 | |
|
Oprd Hat Rock State Park Umatilla County |
500 | 2 | 0 | |
|
Knoll Terrace Park Benton County |
452 | 5 | 0 | |
|
Oprd Clyde Holliday Wayside Grant County |
450 | 2 | 1 | |
|
Tierra Linda Estates Umatilla County |
450 | 5 | 0 | |
|
Gilchrist Water System LLC Klamath County |
440 | 4 | 1 | |
|
Bonanza High/elem Schools Klamath County |
425 | 1 | 0 | |
|
Vadis Camp Washington County |
425 | 2 | 0 | |
|
Douglas CO Pks Halfmoon Bay Douglas County |
400 | 4 | 2 | |
|
Ochoco West Wtr & San Authority Crook County |
400 | 3 | 0 | |
|
Interlachen Water Pud Multnomah County |
360 | 7 | 0 | |
|
Oregon Shores Beach Club INC Klamath County |
352 | 7 | 0 | |
|
Lostine, City of Wallowa County |
350 | 3 | 1 | |
|
Moro, City of Sherman County |
350 | 2 | 0 | |
|
Sea Lion Caves Lane County |
350 | 2 | 0 | |
|
Simnasho Schoolie Warm Springs · County |
350 | 9 | 3 | |
|
Wallowa Lake CO Service Dist Wallowa County |
350 | 5 | 1 | |
|
Halfway, City of Baker County |
346 | 4 | 1 |
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 Oregon 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. Retrieved from ECHO on Oct 11, 2026.