PlainWater
Counties → California

Stanislaus County, California

Water Systems
195
Population Served
511,603
Total Violations
3,426
2,274 health-based
PFAS Detected
6
of 15 tested

Violation Analysis

90.3%
Systems with Violations
17.6
Avg Violations per System
66.4%
Health-Based Violations

Water Source Types

GW
46 systems (24%)
SW
4 systems (2%)

PFAS Contamination

15
Systems Tested
6
PFAS Detected
40.0%
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

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

No violations on record (4) One or more violations (46)

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
Modesto, City Of 218,771 25 Detected
Turlock, City Of 72,682 20 Clean
Ceres, City Of 54,513 28 Detected
Riverbank, City Of 24,834 34 Clean
Patterson, City Of 23,304 8 Clean
Oakdale, City Of 23,235 19 Clean
City of Modesto - Salida 14,537 25 Clean
City of Newman-Water Department 12,207 19 Clean
City of Waterford 8,788 7 Clean
Hughson, City Of 7,481 87 Clean
Keyes Community Services Dist. 5,672 122 Clean
Denair Community Services District 5,090 25 Clean
Joe's Travel Plaza (Eh) 5,026 18 Clean
Department of Transportation 4,375 17 -
Gregori High School 2,000 0 -
Western Hills Water District/Diablo Gran 2,000 87 -
Oid-Oakdale Rural Water System #1 1,570 3 -
City of Modesto - del Rio 1,327 7 -
City of Modesto - South Turlock 1,099 1 -
Waterford-River Pointe 1,079 0 -
Our Lady of Assumption Church 1,000 12 -
City of Modesto - Grayson 914 14 -
Hillsview Homes 887 25 -
Mesa Elementary School 860 0 -
Hart- Ransom Union School & District 650 30 -
Riverdale Park Tract Csd 610 23 -
Waterford - Hickman 597 4 -
Riverview Mobile Home Estates 540 32 -
Woodward Reservoir Water System 537 39 -
Crows Landing Comm Svc District 500 15 -
River Oak Grace-Water System 500 7 -
Jehovah's Witness Sierra Vista Cong 500 6 -
River Oaks/Kingdom Hall 500 3 -
Ceres Unified/Westport School 450 30 -
Bronco Winery 400 19 -
Stanislaus Union School Dist 390 20 -
Chatom School (Eh) 385 12 -
Sunrise Village MHP 353 15 -
5033 Pentecost 302 5 -
Nmip Fire & Water System, LLC 300 17 -
Covenant Grove Church 300 0 -
Oid #51 - Sunset Oaks #10 287 7 -
Oid #46 - Sunset Oaks 269 4 -
Park Heights Mutual Water Co 250 8 -
Ram Naam Mandali Church of Modesto 250 2 -
North Oaks Mutual Water Co 234 14 -
Paradise School 218 10 -
Casa de Amigos Manufactured Housing Comm 204 10 -
The Morning Star Company 200 25 -
Grizzly Rock Cafe 199 7 -

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 Stanislaus County? ▼
Stanislaus County has 3,426 total drinking water violations across 195 water systems, of which 2,274 are health-based violations. 90.3% of systems have at least one violation.
How many people get water from Stanislaus County systems? ▼
Water systems in Stanislaus County serve approximately 511,603 people through 195 public water systems.
Has PFAS been detected in Stanislaus County water? ▼
Of 15 water systems tested for PFAS in Stanislaus County, 6 had PFAS detected (40.0% detection rate).
What types of water sources supply Stanislaus County? ▼
Water systems in Stanislaus County use GW (46 systems), SW (4 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. 66.4% of Stanislaus 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.