Water quality in Grass Valley, Oregon
Grass Valley is in Sherman County. 12 active public water systems serve the county; 9 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Sherman County
3 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Moro, City of |
350 | 2 | 9.0 mi | |
| Wasco, City of |
460 | 3 | 16.5 mi | |
| Rufus Public Works |
270 | 4 | 23.0 mi |
Non-community systems in Sherman County (8: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Sherman County School |
240 | 1 | 0 | |
|
Blm Beavertail Rec North Well |
75 | 1 | 1 | |
|
Oprd Cottonwood Canyon ST PK |
30 | 0 | 0 | |
|
Oprd Deschutes River Rec Area |
200 | 0 | 0 | |
|
Biggs Service District |
1,600 | 2 | 0 | |
|
Pge Biglow Canyon |
30 | 1 | 0 | |
|
Usace John Day Dam |
120 | 0 | 0 | |
|
Usace LE Page Park |
150 | 1 | 0 |
About this data
Water systems are matched to Sherman County, nearest to Grass Valley 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.