Oregon
Washington County drinking water quality
97 active public water systems serve 598,167 people in Washington County. 27 are compliant, 70 had at least one EPA violation in the past three years, 3 are designated serious violators, and 1 carries a health flag.
Needs attention
Community water systems
29 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Tualatin Valley Water District |
224,600 | 0 | 0 | |
|
Hillsboro, City of |
92,632 | 1 | 0 | |
|
Beaverton, City of |
88,045 | 1 | 0 | |
|
Tigard, City of |
62,500 | 2 | 0 | |
|
Tualatin, City of |
28,106 | 1 | 0 | |
|
Forest Grove, City of |
26,838 | 0 | 0 | |
|
Sherwood, City of |
20,781 | 1 | 0 | |
|
Cornelius, City of |
14,490 | 2 | 0 | |
|
West Slope Water District |
11,000 | 2 | 0 | |
|
Raleigh Water District |
4,500 | 1 | 0 | |
|
North Plains Water Department |
3,663 | 1 | 0 | |
|
LA Water Co-Op |
2,500 | 2 | 0 | |
|
Banks Water Department |
2,070 | 0 | 0 | |
|
Hillsboro-Cherry Grove |
1,628 | 3 | 0 | |
|
Gaston, City of |
625 | 2 | 0 | |
|
Fir Grove Homeowners Assn |
450 | 2 | 1 | |
|
Star Satellite Improv Dist |
400 | 1 | 0 | |
|
South Hills Water System |
250 | 0 | 0 | |
|
Westview Mobile Estates |
250 | 2 | 1 | |
|
Laurelwood Water Users |
200 | 6 | 2 | |
|
Timber Water Association |
180 | 9 | 2 | |
|
Parrett Mountain View Estates |
155 | 1 | 0 | |
|
Wolsborn Farms Water District |
92 | 2 | 1 | |
|
West Laurel Acres Water CO |
65 | 3 | 3 | |
|
Laurel Acres Water CO INC |
50 | 4 | 0 | |
|
Rainbow Ends Water System |
50 | 1 | 0 | |
|
Crown Mobile Home Park |
42 | 3 | 2 | |
|
Roth Development |
27 | 1 | 0 | |
|
Joint Water Commission |
0 | 0 | 0 |
Non-community systems (68: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (133, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.