PlainWater
Counties → California

Alameda County, California

Water Systems
27
Population Served
2,249,634
Total Violations
275
35 health-based
PFAS Detected
3
of 8 tested

Violation Analysis

70.4%
Systems with Violations
10.2
Avg Violations per System
12.7%
Health-Based Violations

Water Source Types

SW
15 systems (56%)
GW
12 systems (44%)

PFAS Contamination

8
Systems Tested
3
PFAS Detected
37.5%
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

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

No violations on record (8) One or more violations (19)

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
East Bay MUD 1,442,800 14 Detected
Alameda County Water District 344,000 9 Clean
City of Hayward 162,954 6 Clean
Dublin San Ramon Services District 98,776 4 Clean
City of Pleasanton 76,689 4 Detected
California Water Service - Livermore 60,414 2 Detected
City of Livermore 38,892 2 Clean
Lawrence Livermore National Lab Site 200 10,870 0 Clean
Ebrpd - del Valle Regional Park 9,024 28 -
Chp - Mission Grade Scales 1,800 2 -
Alameda Point 1,400 0 -
Castlewood Domestic Water System 524 6 -
Trailer Haven Mobile Home Park 459 4 -
Town of Sunol - Sfpuc 281 1 -
Sunol Super Stop 155 0 -
Ebrpd - Sunol Regional Wilderness 91 0 -
Usbr-Sldmwa - Cvp Jones Pumping Plant 90 0 -
Alameda County Fairgrounds 82 20 -
Purple Orchid Resort Spa 52 0 -
Norris Canyon Property Owners Assn 50 111 -
Mountain House School 50 13 -
Ebrpd - Piedmont Stables 45 0 -
Zone 7 Water Agency 40 6 -
Rancho los Mochos-Bsa Camp 38 2 -
Rivers End Marina 32 31 -
Mountain House Bar 25 10 -
Sfpuc-Pleasanton Wells 1 0 -

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
Santa Clara County
119 systems · 2,097,044 served · 2,640 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Alameda County? ▼
Alameda County has 275 total drinking water violations across 27 water systems, of which 35 are health-based violations. 70.4% of systems have at least one violation.
How many people get water from Alameda County systems? ▼
Water systems in Alameda County serve approximately 2,249,634 people through 27 public water systems.
Has PFAS been detected in Alameda County water? ▼
Of 8 water systems tested for PFAS in Alameda County, 3 had PFAS detected (37.5% detection rate).
What types of water sources supply Alameda County? ▼
Water systems in Alameda County use SW (15 systems), GW (12 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. 12.7% of Alameda 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.