PlainWater
Counties → California

Mendocino County, California

Water Systems
147
Population Served
83,647
Total Violations
1,646
380 health-based
PFAS Detected
1
of 8 tested

Violation Analysis

77.6%
Systems with Violations
11.2
Avg Violations per System
23.1%
Health-Based Violations

Water Source Types

SW
26 systems (18%)
GW
24 systems (16%)

PFAS Contamination

8
Systems Tested
1
PFAS Detected
12.5%
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

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

No violations on record (3) One or more violations (47)

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
Ukiah, City Of 16,607 4 Detected
Fort Bragg, City Of 6,919 12 Clean
Willits, City Of 6,175 28 Clean
Millview County Water District 5,500 6 Clean
Redwood Valley County Water District 5,200 12 Clean
Willow County Water District 3,797 7 Clean
Brooktrails Township Csd 3,632 7 Clean
North Gualala Water Company 2,593 11 -
Rogina Water Company Inc. 2,554 7 -
Csp-Van Damme State Park 2,004 7 -
U.S. Army Corps-Lake Mendo (Bushay Site) 2,000 2 -
U.S. Army Corps-Lake Mendo (Kyen Cmpgrd) 1,500 6 -
Csp-Mackerricher State Park 1,416 10 -
Laytonville County Water District 1,152 34 -
Hopland Public Utility District 1,076 27 -
Mendocino School District- Mendocino 579 9 -
Dolphin Isle Marina 560 12 -
Calpella County Water District 548 11 -
Tesoro 68137 508 2 -
Csp-Standish Hickey State Rec Area 503 9 -
Mendocino County Fairgrounds 500 2 -
Csp-Mendocino Headlands-Sea Arch 500 0 -
Point Arena Water Works 459 5 -
Csp-Pt. Cabrillo Light Station Shp 430 2 -
Albion River Campground 425 17 -
Wente Scout Reservation 422 15 -
Csp-Manchester State Park 420 7 -
Moss Cove Rest Stop (Caltrans) 400 0 -
Csp-Mendocino Woodlands 400 8 -
City of 10,000 Buddhas 400 29 -
Elk County Water District 380 10 -
Csp-Westport State Beach 370 6 -
Westport County Water District 369 55 -
Hidden Pines Campground 362 8 -
Anderson Valley Elementary School 350 16 -
Camp Mendocino 321 18 -
Pine Mountain Mutual Water Co. 310 19 -
Potter Valley School District 309 17 -
Irvine Lodge Rest Stop (Caltrans) 300 2 -
Empire Rest Stop (Caltrans) 300 0 -
U.S. Army Corps-Lake Mendo (Pomo Site) 300 4 -
Anderson Valley High School 300 14 -
Round Valley Elementary School 289 8 -
Camp Navarro 284 6 -
Woodside RV Park 280 20 -
Csp-Mendocino Headlands - Ford House 275 2 -
Manchester Beach KOA 273 4 -
Ridgewood Water System 265 25 -
Green Acres Trailer Park 256 4 -
Irish Beach Water District 254 13 -

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 Mendocino County? ▼
Mendocino County has 1,646 total drinking water violations across 147 water systems, of which 380 are health-based violations. 77.6% of systems have at least one violation.
How many people get water from Mendocino County systems? ▼
Water systems in Mendocino County serve approximately 83,647 people through 147 public water systems.
Has PFAS been detected in Mendocino County water? ▼
Of 8 water systems tested for PFAS in Mendocino County, 1 had PFAS detected (12.5% detection rate).
What types of water sources supply Mendocino County? ▼
Water systems in Mendocino County use SW (26 systems), GW (24 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. 23.1% of Mendocino 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.