California
Colusa County drinking water quality
28 active public water systems serve 35,510 people in Colusa County. 25 are compliant, 3 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
9 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
City of Colusa Colusa |
6,675 | 0 | 0 | |
|
City of Williams Williams |
5,538 | 0 | 0 | |
|
Arbuckle Public Utility District |
3,251 | 2 | 1 | |
|
Maxwell Public Utility District |
1,175 | 1 | 1 | |
|
Colusa Co. Wwd #1 Grimes |
512 | 2 | 1 | |
|
Colusa Co. Service Area #1-Century Ranch |
450 | 0 | 0 | |
|
Colusa Co. Wwd #2 Princeton |
382 | 0 | 0 | |
|
Del Oro WC Arbuckle District |
185 | 0 | 0 | |
|
Colusa Co. Service Area #2-Stonyford |
160 | 0 | 0 |
Non-community systems (19: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Caltrans-Maxwell Reststops |
15,000 | 0 | 0 | |
|
Colusa Industrial Properties |
533 | 0 | 0 | |
|
Menf-Fouts Springs CG |
531 | 0 | 0 | |
|
Colusa Landing |
168 | 0 | 0 | |
|
Arbuckle Golf Club |
126 | 0 | 0 | |
|
Menf-Letts Lake CG |
118 | 0 | 0 | |
|
Sun Valley Rice Company |
104 | 0 | 0 | |
|
Adam's Vegetable Oils |
97 | 0 | 0 | |
|
Wilbur Hot Springs |
97 | 0 | 0 | |
|
Adm Rice Inc. |
91 | 0 | 0 | |
|
Highway 20 Trailer Park |
63 | 0 | 0 | |
|
Grimes Boat Landing |
50 | 0 | 0 | |
|
Richmond Hunting Club-Maxwell |
40 | 0 | 0 | |
|
Willow Creek M.w.c.-Lambertville |
31 | 0 | 0 | |
|
Morning Star Pkg. Co.-Wms. |
30 | 0 | 0 | |
|
Kingdom Hall of Jehovah's Witness-Wms |
26 | 0 | 0 | |
|
Terhel Farms Trailer Park 01 |
26 | 0 | 0 | |
|
Terhel Farms Trailer Park 02 Colusa |
26 | 0 | 0 | |
|
T&p Farms |
25 | 0 | 0 |
Inactive systems (39, 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 California 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.