PlainWater
Counties → California

Colusa County, California

Water Systems
29
Population Served
35,121
Total Violations
273
129 health-based
PFAS Detected
2
of 2 tested

Violation Analysis

86.2%
Systems with Violations
9.4
Avg Violations per System
47.3%
Health-Based Violations

Water Source Types

GW
28 systems (97%)
SW
1 system (3%)

PFAS Contamination

2
Systems Tested
2
PFAS Detected
100.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Colusa California water systems by violation status, EPA SDWIS records.

No violations on record (4) One or more violations (25)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Caltrans-Maxwell Reststops 15,000 3 -
City of Colusa 6,447 8 Clean
City of Williams 5,538 6 Clean
Arbuckle Public Utility District 2,778 12 -
Maxwell Public Utility District 1,175 9 -
Colusa Industrial Properties 533 5 -
Menf-Fouts Springs Cg 531 0 -
Colusa Co. Wwd #1 - Grimes 512 104 -
Morning Star Pkg. Co.-Wms. 390 9 -
Colusa Co. Wwd #2 - Princeton 382 21 -
Colusa Co. Service Area #2-Stonyford 250 15 -
Colusa Co. Service Area #1-Century Ranch 246 10 -
Del Oro WC - Arbuckle District 185 2 -
Colusa Landing 168 4 -
Sun Valley Rice Company 151 8 -
Arbuckle Golf Club 126 0 -
Menf-Letts Lake Cg 118 5 -
Wilbur Hot Springs 97 6 -
Adam's Vegetable Oils 95 10 -
Adm Rice Inc. 87 7 -
Highway 20 Trailer Park 63 10 -
Grimes Boat Landing 50 0 -
Richmond Hunting Club-Maxwell 40 4 -
Willow Creek M.W.C.-Lambertville 31 2 -
Terhel Farms Trailer Park 01 26 6 -
Kingdom Hall of Jehovah's Witness-Wms 26 2 -
Terhel Farms Trailer Park 02 26 2 -
Ward's Boat Landing 25 3 -
T&p Farms 25 0 -

Other Counties in California

Los Angeles County
276 systems · 10,109,089 served · 3,972 violations
San Diego County
197 systems · 3,744,323 served · 4,832 violations
Orange County
46 systems · 3,201,893 served · 507 violations
Riverside County
201 systems · 2,839,125 served · 6,103 violations
San Bernardino County
318 systems · 2,830,626 served · 4,611 violations
Alameda County
27 systems · 2,249,634 served · 275 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Colusa County? ▼
Colusa County has 273 total drinking water violations across 29 water systems, of which 129 are health-based violations. 86.2% of systems have at least one violation.
How many people get water from Colusa County systems? ▼
Water systems in Colusa County serve approximately 35,121 people through 29 public water systems.
Has PFAS been detected in Colusa County water? ▼
Of 2 water systems tested for PFAS in Colusa County, 2 had PFAS detected (100.0% detection rate).
What types of water sources supply Colusa County? ▼
Water systems in Colusa County use GW (28 systems), SW (1 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 47.3% of Colusa County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.