PlainWater
Counties → California

San Bernardino County, California

Water Systems
318
Population Served
2,830,626
Total Violations
4,611
1,848 health-based
PFAS Detected
34
of 49 tested

Violation Analysis

91.5%
Systems with Violations
14.5
Avg Violations per System
40.1%
Health-Based Violations

Water Source Types

GW
34 systems (11%)
SW
16 systems (5%)

PFAS Contamination

49
Systems Tested
34
PFAS Detected
69.4%
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 Bernardino 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
San Gabriel Valley WC - Fontana 237,700 3 Clean
San Bernardino City 214,665 2 Detected
Cucamonga Valley Water District 211,069 5 Clean
Ontario Municipal Utilities Company 185,010 9 Detected
Victorville Water District 135,983 13 Clean
San Bernardino Valley WD 109,608 2 -
East Valley Water District 108,629 13 Detected
West Valley Water District 104,498 19 Clean
Hesperia WD 100,744 7 Detected
Chino, City Of 86,435 44 Clean
Big Bear Administration 81,075 12 -
Upland, City Of 78,376 10 Detected
Redlands City MUD-Water Div 78,025 11 Detected
Chino Hills, City Of 76,414 43 Clean
Snow Summit 75,500 45 -
Liberty Utilities (Av Ranchos) Corp. 64,469 2 Clean
Park Moabi 64,267 2 -
Monte Vista WD 56,017 27 Detected
Rialto, City Of 54,453 6 Detected
Yucaipa Valley Water District 52,010 19 Detected
Colton, City Of 46,525 3 Detected
Adelanto, City Of 39,930 40 Detected
Golden State Water Co - Barstow 32,547 2 Detected
HI Desert WD 26,411 17 Detected
Big Bear Lake Dwp - Big Bear System 26,132 3 Detected
Loma Linda, City Of 25,129 9 Clean
Calico Ghost Town 24,623 131 -
Phelan Pinon Hills Csd 24,285 3 Clean
Riverside Highland Water Company 20,188 6 Detected
Twentynine Palms Water District 18,795 254 Clean
US Army Fort Irwin 15,701 146 Clean
Loma Linda University 15,368 5 Detected
Usmc - 29 Palms 15,248 11 Clean
Thousand Pines Christian 15,034 5 -
Sbdno County Service Area 64 14,911 7 Clean
Hanna Flats Campground 14,380 0 -
Muscoy MWC No. 1 13,000 45 Clean
Sbdno County Service Area 70J 12,843 5 Clean
Big Bear City Csd 12,738 1 Detected
Crestline Village Cwd - Division 10 11,650 10 Detected
California Institution for Men 10,667 35 Clean
Green Valley Campground 9,939 0 -
Needles, City Of 8,766 17 Clean
Western Heights Water Company 7,705 6 Clean
Lake Arrowhead Csd 7,038 0 Detected
Arrowhead Regional Medical Center 7,000 4 -
Joshua Basin Water District 6,640 9 Clean
YMCA Camp Whittle 6,466 15 -
Helendale Community Service District 6,347 51 Detected
Golden State Water Co - Apple Vly South 6,208 1 Clean

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
Alameda County
27 systems · 2,249,634 served · 275 violations
Santa Clara County
119 systems · 2,097,044 served · 2,640 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in San Bernardino County? ▼
San Bernardino County has 4,611 total drinking water violations across 318 water systems, of which 1,848 are health-based violations. 91.5% of systems have at least one violation.
How many people get water from San Bernardino County systems? ▼
Water systems in San Bernardino County serve approximately 2,830,626 people through 318 public water systems.
Has PFAS been detected in San Bernardino County water? ▼
Of 49 water systems tested for PFAS in San Bernardino County, 34 had PFAS detected (69.4% detection rate).
What types of water sources supply San Bernardino County? ▼
Water systems in San Bernardino County use GW (34 systems), SW (16 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. 40.1% of San Bernardino 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.