PlainWater
Counties → California

San Joaquin County, California

Water Systems
310
Population Served
775,760
Total Violations
5,057
2,979 health-based
PFAS Detected
9
of 13 tested

Violation Analysis

93.2%
Systems with Violations
16.3
Avg Violations per System
58.9%
Health-Based Violations

Water Source Types

GW
39 systems (13%)
SW
11 systems (4%)

PFAS Contamination

13
Systems Tested
9
PFAS Detected
69.2%
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

San Joaquin 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
City of Stockton 191,302 24 Detected
California Water Service - Stockton 176,266 2 Detected
Tracy, City Of 96,609 10 Clean
Manteca, City Of 84,928 77 Detected
Lodi, City Of 68,272 16 Detected
City of Lathrop 35,080 124 Detected
City of Mountain House 24,948 3 Clean
Ripon, City Of 15,741 30 Detected
Escalon, City Of 7,429 35 Clean
San Joaquin County - Lincoln Village 5,990 5 Clean
Cdcr California Health Care Facility 5,551 6 -
San Joaquin County-Mokelumne Acres 3,802 0 Detected
Lockeford Community Serv. Dist. 3,572 20 -
Jimmys One Stop 2,505 27 -
San Joaquin County - Colonial Heights 1,841 1 -
Linden County Water District 1,784 12 -
Little Potato Slough Mutual 1,510 29 -
Oakwood Lake Water District-Subdivision 1,479 12 -
Starbucks 1,200 0 -
Defense Distrib. Depot - Tracy Site 1,200 9 -
Fairoaks PWS #44 1,172 1 -
Family Market Water System 1,105 0 -
San Joaquin County-Raymus Village 1,086 12 -
Sjc Micke Grove Park 1,025 38 -
Escalon Golf Course WS 1,010 16 -
King Island Resort PWS 1,000 28 -
Smk Chevron 1,000 2 -
Jahant Food N Fuel Stop 1,000 12 -
Horizon Christian Fellowship 1,000 37 -
San Joaquin County - Thornton 964 7 -
St Marys High School 950 11 -
San Joaquin County - Wilkinson Manor 851 8 -
Navarra Water System 730 26 -
Stockton Verde Mobile Home Park 711 20 -
Lodi Usd-Davis School 630 18 -
Rodeway Inn 600 7 -
San Joaquin River Club Inc 600 13 Clean
Central Valley Baptist Church WS 556 32 -
Harney Lane Migrant Center WS 500 66 -
Defense Distrib. Depot, Sharpe Site 500 15 -
Sutter Home Winery Inc. 463 4 -
Delicato Vineyards 430 39 -
Morada Estates N PWS #46 426 1 -
Lodi Usd-Houston School 405 11 -
Wienerschnitzel 400 0 -
Oak View Union Elementary Sch 350 23 -
Musco Family Olive Co 348 5 -
Arbor Mobile Home Park WS 340 26 -
Phillips Farms 330 56 -
French Camp Golf Course 327 37 -

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 San Joaquin County? ▼
San Joaquin County has 5,057 total drinking water violations across 310 water systems, of which 2,979 are health-based violations. 93.2% of systems have at least one violation.
How many people get water from San Joaquin County systems? ▼
Water systems in San Joaquin County serve approximately 775,760 people through 310 public water systems.
Has PFAS been detected in San Joaquin County water? ▼
Of 13 water systems tested for PFAS in San Joaquin County, 9 had PFAS detected (69.2% detection rate).
What types of water sources supply San Joaquin County? ▼
Water systems in San Joaquin County use GW (39 systems), SW (11 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. 58.9% of San Joaquin 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.