Tap Truth EPA drinking water records, in plain English

County drinking water records

Colusa County, CA drinking water systems

11 community water systems serve Colusa County, CA, reporting 21,085 people served in all. A system that also serves other counties counts all of its customers here.

1 of them (9%) had at least one health-based violation in the last 10 years. 3 systems still have one unresolved.

10 rely mainly on groundwater and 1 on surface water, counting water bought from other systems.

Their lead service line inventories list 0 lead lines, 10 galvanized lines that must be replaced and 1,038 lines of unknown material.

1 more system lists a mailing address in Colusa County, CA but has no service area map, so it is listed apart and not counted here.

Community water systems
11
People served, sum of each system's own figure
21,085
Systems with a health-based violation, last 10 years
1
Systems with one unresolved
3
Lead service lines in inventories
0

Water systems serving Colusa County

11 systems

People served is each system's own figure for its whole service area. Violation counts cover the last 10 years of EPA records.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
City of Colusa Colusa 6,447 Groundwater 0 0 0
City of Williams Williams 5,538 Groundwater 0 0 0
Colusa Southern System Princeton and land outside it 3,474 Groundwater 0 0 0
Arbuckle Public Utility District Arbuckle 2,778 Groundwater 0 1 0
Maxwell Public Utility District Maxwell 1,175 Groundwater 0 1 0
Colusa Co. WWD #1 - Grimes Grimes 512 Groundwater 34 1 0
Colusa Co. WWD #2 - Princeton Princeton 382 Groundwater 0 0 0
Colusa Co. Service Area #2-Stonyford Stonyford 250 Groundwater 0 0 0
Colusa Co. Service Area #1-Century Ranch Colusa 246 Surface water 0 0 0
Del Oro WC - Arbuckle District Arbuckle 185 Groundwater 0 0 0
Upper Lake Hardisty System Lodoga 98 Groundwater 0 0 0

Systems with a mailing address in Colusa County

1 system

EPA has no service area map for this system, and a mailing address is often an office away from the area served, so it is not counted in the figures above.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Colusa Northern System Mailing address in Colusa 67 Groundwater 0 0 0

Cities and towns in Colusa County

8 places

Back to California

Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations