Water quality in Seneca, Oregon
Seneca is in Grant County. 14 active public water systems serve the county; 13 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Grant County
7 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Canyon City Water Department |
666 | 3 | 17.7 mi | |
| John Day, City of |
1,617 | 2 | 19.7 mi | |
| Mount Vernon, City of |
510 | 1 | 20.5 mi | |
| Prairie City |
841 | 4 | 26.1 mi | |
| Dayville, City of |
155 | 0 | 35.9 mi | |
| Long Creek, City of |
173 | 1 | 40.6 mi | |
| Monument, City of |
115 | 4 | 52.2 mi |
Non-community systems in Grant County (6: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Snaffle Bit Dinner House |
50 | 2 | 0 | |
|
Usfs Bull Prairie Sprg CG |
25 | 4 | 2 | |
|
Nps John Day Nm/sheep Rock |
115 | 1 | 0 | |
|
Oprd Clyde Holliday Wayside |
450 | 2 | 1 | |
|
Lake Creek Youth Rec Camp |
75 | 1 | 0 | |
|
Usfs Magone Lake CG |
26 | 1 | 0 |
About this data
Water systems are matched to Grant County, nearest to Seneca first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
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.