COUNTY WATER-SYSTEM LEDGER
Washington, Oregon
EPA’s September 2026 export lists 12 active community water systems serving Washington, Oregon, with 0 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving Washington, Oregon
EPA associates 12 covered systems with Washington, Oregon; their reported population-served values total 578,759 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Tualatin Valley Water DistrictOR4100665 | 224,600 | Surface water purchased | No current violation flagged |
| Hillsboro, City OfOR4101513 | 92,632 | Surface water purchased | No current violation flagged |
| Beaverton, City OfOR4100081 | 88,045 | Surface water purchased | No current violation flagged |
| Tigard, City OfOR4100878 | 62,500 | Surface water purchased | No current violation flagged |
| Tualatin, City OfOR4100906 | 28,106 | Surface water purchased | No current violation flagged |
| Forest Grove, City OfOR4100305 | 26,838 | Surface water | No current violation flagged |
| Sherwood, City OfOR4100816 | 19,885 | Surface water purchased | No current violation flagged |
| Cornelius, City OfOR4100218 | 14,490 | Surface water purchased | No current violation flagged |
| West Slope Water DistrictOR4100660 | 11,000 | Surface water purchased | No current violation flagged |
| Raleigh Water DistrictOR4100667 | 4,500 | Surface water purchased | No current violation flagged |
| North Plains Water DepartmentOR4100576 | 3,663 | Surface water purchased | No current violation flagged |
| La Water Co-OpOR4100313 | 2,500 | Surface water purchased | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Washington, Oregon
EPA classifies 12 systems serving Washington, Oregon across 2 primary-source categories; Surface water purchased is the largest category with 11 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.