Washington
Columbia County drinking water quality
12 active public water systems serve 4,639 people in Columbia County. 7 are compliant, 5 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.
Community water systems
2 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Dayton Water Department |
3,374 | 0 | 0 | |
|
Starbuck City of |
147 | 1 | 0 |
Non-community systems (10: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Bluewood Ski Area |
532 | 1 | 0 | |
|
Lewis & Clark Trail State Park |
239 | 0 | 0 | |
|
Camp Wooten State Park |
131 | 0 | 0 | |
|
Little Goose Dam |
62 | 0 | 0 | |
|
Lyons Ferry Marina |
54 | 2 | 0 | |
|
Touchet Valley Baptist Camp |
40 | 0 | 0 | |
|
Columbia Pulp I |
25 | 0 | 0 | |
|
Last Resort |
22 | 1 | 0 | |
|
Tucannon River Retreat |
7 | 0 | 0 | |
|
Shangri-La Ranch Park |
6 | 2 | 0 |
Inactive systems (12, 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 Washington 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.