Total Haloacetic Acids (HAA5) violations in Oregon
133 active public water systems in Oregon had a Total Haloacetic Acids (HAA5) violation in the past three years, 4 of them in the latest quarter of EPA's data. What Total Haloacetic Acids (HAA5) is and why it matters.
Systems with a Total Haloacetic Acids (HAA5) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Wilsonville, City of Clackamas County |
25,915 | 2 | 0 | |
|
ST Helens, City of Columbia County |
13,410 | 3 | 0 | |
|
Warm Springs Water Treatment Plant Warm Springs · County |
3,800 | 16 | 5 | |
|
Guide Dogs for the Blind INC Clackamas County |
75 | 2 | 0 | |
|
Tigard, City of Washington County |
62,500 | 2 | 0 | |
|
Milwaukie, City of Clackamas County |
20,946 | 6 | 1 | |
|
Pendleton, City of Umatilla County |
16,996 | 2 | 0 | |
|
The Dalles, City of Wasco County |
13,010 | 5 | 1 | |
|
Gladstone, City of Clackamas County |
12,121 | 2 | 0 | |
|
Sweet Home, City of Linn County |
10,322 | 4 | 1 | |
|
Hood River, City of Hood River County |
8,577 | 3 | 0 | |
|
Sheridan, City of Yamhill County |
6,494 | 7 | 0 | |
|
Talent, City of Jackson County |
6,293 | 4 | 0 | |
|
Mount Angel, City of Marion County |
3,650 | 3 | 0 | |
|
Nyssa, City of Malheur County |
3,285 | 3 | 0 | |
|
SW Lincoln CO Water Pud Lincoln County |
3,000 | 7 | 0 | |
|
LA Water Co-Op Washington County |
2,500 | 2 | 0 | |
|
Cave Junction, City of Josephine County |
2,160 | 2 | 0 | |
|
North Marion SD #15 Marion County |
2,100 | 2 | 0 | |
|
Vernonia, City of Columbia County |
2,100 | 6 | 1 | |
|
Clatskanie, City of Columbia County |
2,096 | 5 | 0 | |
|
City of Rainier Columbia County |
1,932 | 8 | 0 | |
|
Brownsville, City of Linn County |
1,906 | 6 | 0 | |
|
Vale, City of Malheur County |
1,837 | 3 | 0 | |
|
Colton Water District Clackamas County |
1,500 | 4 | 0 | |
|
Usfs Timberline Lodge 1 Clackamas County |
1,500 | 4 | 0 | |
|
Port of Morrow Morrow County |
1,350 | 4 | 0 | |
|
Lyons Mehama Water District Linn County |
1,300 | 6 | 0 | |
|
Riddle, City of Douglas County |
1,224 | 4 | 0 | |
|
Port Orford, City of Curry County |
1,200 | 4 | 0 | |
|
Southwood Park Water District Clackamas County |
900 | 6 | 0 | |
|
Prairie City Grant County |
841 | 4 | 0 | |
|
Buell-Red Prairie WD Polk County |
800 | 8 | 0 | |
|
Panther Creek WD Lincoln County |
800 | 5 | 0 | |
|
OR Youth Authority Maclaren Marion County |
750 | 5 | 1 | |
|
Monroe, City of Benton County |
723 | 5 | 1 | |
|
Mapleton Water District Lane County |
600 | 8 | 0 | |
|
Riverbend Mobile Home Park Clackamas County |
600 | 2 | 0 | |
|
Olney-Walluski Water Assn Clatsop County |
575 | 3 | 0 | |
|
Hiland WC Illahe Golf Club Estates Marion County |
561 | 6 | 0 | |
|
Mosier, City of Wasco County |
468 | 3 | 1 | |
|
South Prairie Water Assn Tillamook County |
440 | 2 | 1 | |
|
Maupin, City of Wasco County |
420 | 7 | 2 | |
|
Orchard Heights Water Assn Polk County |
381 | 2 | 0 | |
|
Fishhawk Lake Reserve and Community Columbia County |
350 | 6 | 1 | |
|
Sunstone Boulder Creek Lincoln County |
350 | 5 | 0 | |
|
John Day Water District Clatsop County |
350 | 6 | 1 | |
|
Burlington Water District Multnomah County |
340 | 2 | 0 | |
|
Row River Valley Water Dist Lane County |
340 | 7 | 1 | |
|
Alder Creek Barlow Water Dist Clackamas County |
300 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Total Haloacetic Acids (HAA5), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Total Haloacetic Acids (HAA5) 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.