PlainWater
Counties → California

Ventura County, California

Water Systems
95
Population Served
882,799
Total Violations
1,507
463 health-based
PFAS Detected
18
of 20 tested

Violation Analysis

87.4%
Systems with Violations
15.9
Avg Violations per System
30.7%
Health-Based Violations

Water Source Types

SW
32 systems (34%)
GW
18 systems (19%)

PFAS Contamination

20
Systems Tested
18
PFAS Detected
90.0%
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

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

No violations on record (9) One or more violations (41)

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
Oxnard Water Dept 200,232 14 Clean
Ventura Water Department 113,500 12 Detected
Ventura Wwd No. 8 - Simi Valley 94,738 12 Clean
Cal American Water Co 66,809 10 Clean
City of Thousand Oaks Water Department 53,157 0 Clean
Camarillo Water Dept 46,824 0 Clean
Golden State Water Company - Simi Valley 45,128 0 Clean
Ventura Cwwd No. 1 - Moorpark 35,514 0 Clean
Camrosa Water District 32,700 7 Detected
City of Santa Paula 31,018 4 Clean
Port Hueneme City Water Dept 21,407 16 Clean
California Water Service Co - Westlake 19,533 0 Clean
Fillmore Water Dept 16,419 13 Clean
Triunfo Water & Sanitation District 13,898 11 Clean
Casitas Municipal Water Dist 11,005 20 Clean
Naval Base Ventura County, Port Hueneme 8,625 14 -
Ojai Water System 6,801 4 Clean
Ventura River Water District 6,100 10 Clean
Naval Base Ventura County, Point Mugu 5,700 14 -
Pleasant Valley Mutual Water Co 5,000 9 Detected
Channel Islands Beach Csd 4,560 0 Clean
Meiners Oaks Cwd 4,200 23 Clean
Smith Forks Water System 3,000 2 -
Rio Mesa High School/Oxnard Uhs 2,600 8 -
Crestview Mutual Water Co 2,079 7 -
Cal American WC - las Posas Estates 2,039 0 -
Cal American Water Company - Piru 2,003 6 -
Ventura Cwwd No. 17 - Bell Canyon 1,946 0 -
Vineyard Avenue Acres MWC 1,820 12 -
Ventura Cwwd No. 38 - Lake Sherwood 1,759 0 -
Cal American WC - Rio Plaza 1,709 11 -
Ventura Cwwd No. 19 - Somis 1,429 2 -
Garden Acres Mutual Water Co 1,335 16 -
Vineyard Ave Estates MWC 1,200 8 -
Limoneira Ranch #1 1,187 6 -
Dempsey Road Mutual Water Co 990 3 -
Rio Manor Mutual Water Co 983 20 -
Nyeland Acres Mutual Water Co 975 53 -
Lake Piru Park - Uwcd 960 28 -
Rio School Dist/Rio del Valle School 820 15 -
Senior Canyon Mutual Water Co 800 42 -
Crown Pointe Estates at Malibu, LLC 690 11 -
Brandeis Bardin Institute 665 14 -
Rancho Sespe Workers Imp Assoc 600 16 -
Glass House Camarillo Cultivation, LLC 600 12 -
Rio School Dist/ Rio Real School 550 12 -
Usfs - Wheeler Gorge Campground 500 50 -
Thomas Aquinas College 472 13 -
Cloverdale Mutual Water Co. 455 8 -
Strickland Mutual Water Company 429 78 -

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 Ventura County? ▼
Ventura County has 1,507 total drinking water violations across 95 water systems, of which 463 are health-based violations. 87.4% of systems have at least one violation.
How many people get water from Ventura County systems? ▼
Water systems in Ventura County serve approximately 882,799 people through 95 public water systems.
Has PFAS been detected in Ventura County water? ▼
Of 20 water systems tested for PFAS in Ventura County, 18 had PFAS detected (90.0% detection rate).
What types of water sources supply Ventura County? ▼
Water systems in Ventura County use SW (32 systems), GW (18 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. 30.7% of Ventura 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.