PlainWater
Counties → California

Monterey County, California

Water Systems
315
Population Served
476,400
Total Violations
13,641
6,827 health-based
PFAS Detected
12
of 16 tested

Violation Analysis

95.9%
Systems with Violations
43.3
Avg Violations per System
50.0%
Health-Based Violations

Water Source Types

GW
45 systems (14%)
SW
5 systems (2%)

PFAS Contamination

16
Systems Tested
12
PFAS Detected
75.0%
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

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

No violations on record (1) One or more violations (49)

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
Cwsc Salinas 123,679 24 Clean
Cal Am Water Company - Monterey 92,450 17 Detected
Alco Water Service 56,253 15 Clean
Marina Coast Water District 38,377 8 Clean
Soledad, City Of 19,455 22 Clean
Greenfield, City Of 18,967 13 Clean
Cwsc King City 16,334 4 Clean
Gonzales, City Of 8,327 24 Clean
Castroville Community Services District 7,515 13 Clean
Psmcsd - Pajaro 6,500 5 Clean
Soledad Mission WS 6,000 70 -
Cwsc Salinas Hills 5,293 6 Clean
Correctional Training Facility - Soledad 4,269 32 Clean
Cwsc Oak Hills 3,161 9 Clean
Salinas Valley State Prison 2,930 8 Clean
Seaside Municipal Water System 2,800 15 -
Fort Hunter Liggett 2,753 11 -
Caltrans Camp Roberts Rsra Sb 2,560 31 -
Little Bear Water Company 2,327 18 -
Cwsc las Lomas 2,084 5 Clean
Prunetree Shopping Center WS 2,000 28 -
Tasco Spreckels Water Company 1,772 14 -
Caltrans Camp Roberts Rsra Nb 1,750 38 -
Prunedale Shopping Center WS 1,650 34 -
Laguna Seca Recreation WS 1,248 198 -
Cal Am Water Company - Chualar 1,139 4 -
Cal Am Water Company - Hidden Hills 1,106 0 -
Cal Am Water Company - Toro 1,065 31 -
Csp-Andrew Molera State Reserve 1,005 8 -
San Antonio Lake Park North WS 1,002 27 -
Cal Am Water Company - Ambler Park 980 5 -
Santa Lucia Preserve WS 966 33 -
Psmcsd - Normco 928 25 -
Bud Antle, LLC-Soledad Facility WS 900 32 -
Psmcsd - Sunny Mesa 880 19 -
Csp-J.p. Burns Park 802 4 -
Corral de Tierra Country Club WS 705 41 -
Elkhorn School WS 694 16 -
El Camino Real WS #16 679 18 -
Prunedale School WS 655 31 -
San Antonio Lake Park South WS 653 50 -
Cdfw Elkhorn Slough Ecological Reserve 650 20 -
Nepenthe WS 618 38 -
Csp-Pfeiffer Big Sur 585 14 -
Carmel Riviera MWC 584 58 -
Echo Valley School WS 579 81 -
San Ardo WD 575 27 -
Monterey Mushrooms - Maher Crt 554 61 -
Gabilan WC 535 52 -
Psmcsd - Moss Landing Harbor WS 520 8 -

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 Monterey County? ▼
Monterey County has 13,641 total drinking water violations across 315 water systems, of which 6,827 are health-based violations. 95.9% of systems have at least one violation.
How many people get water from Monterey County systems? ▼
Water systems in Monterey County serve approximately 476,400 people through 315 public water systems.
Has PFAS been detected in Monterey County water? ▼
Of 16 water systems tested for PFAS in Monterey County, 12 had PFAS detected (75.0% detection rate).
What types of water sources supply Monterey County? ▼
Water systems in Monterey County use GW (45 systems), SW (5 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. 50.0% of Monterey 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.