PlainWater
Counties → California

Madera County, California

Water Systems
204
Population Served
181,924
Total Violations
7,852
3,406 health-based
PFAS Detected
4
of 7 tested

Violation Analysis

91.7%
Systems with Violations
38.5
Avg Violations per System
43.4%
Health-Based Violations

Water Source Types

GW
46 systems (23%)
SW
4 systems (2%)

PFAS Contamination

7
Systems Tested
4
PFAS Detected
57.1%
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

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

No violations on record (7) One or more violations (43)

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 Madera 66,560 23 Clean
Chowchilla City Water Dept 13,916 23 Detected
Lupine Bass Lake 11,930 47 -
Madera Valley Water Company 6,494 15 Clean
Riverstone/Rootcreek Water District 5,507 2 -
Yosemite Spring Park Util Co 5,300 86 Detected
Cal Am - Bass Lake 4,527 8 Detected
Tesoro Viejo Master MWC, Inc. 3,885 0 -
Cal Am - Oakhurst 3,693 231 Clean
Yosemite Nps-Mariposa Grove 3,500 0 -
Valley State Prison 3,173 68 -
Madera Co Md10a-Madera Ranchos 3,172 12 -
Millerton Sra Meadow Tank Hill 2,506 20 -
Valley Children's Hospital 2,500 22 -
Central Ca Womens Facility 2,183 0 -
Tom Pistachio Water System 2,100 4 -
Madera Co Sa3-Parksdale 1,789 14 -
Madera Co Cmd19-Parkwood 1,637 14 -
Madera Co Sa1-Indian Lakes 1,562 22 -
Nps-Devils Postpile 1,220 8 -
Bakman Water-Rolling Hills 1,107 12 Clean
Cal Am - Goldside 1,043 14 -
Forks Resort 853 10 -
Madera Community College 750 28 -
Etaa Facilities LLC 736 5 -
Howard Elementary School 618 14 -
Preserve at Millerton Lake Water System 600 0 -
MD 33 Fairmead 568 13 -
Yosemite Lakes Community Church 551 46 -
United Pacific #0251 530 0 -
Sws Land Development Inc 529 90 -
Madera District Fair 512 12 -
Studios 6 Suites 508 20 -
North Fork Elementary School 500 93 -
Sierra Pines Church 500 0 -
Broadview Terrace Mutual Water Company 498 14 -
Rivergold Elementary School 485 5 -
Madera Mh & RV Park 450 161 -
Cbuso Mission Bell 450 74 -
Skp Park of the Sierras Inc 450 15 -
Minarets High School 450 7 -
Coarsegold School 441 13 -
Wp&a-Firebaugh Water System 435 0 -
Ardagh Glass, Inc 384 70 -
MD 73 Quartz Mountain 375 9 -
Oak Creek Mobile Home Park 370 3 -
Yosemite RV Resort 361 31 -
Wasuma School 354 52 -
MD 37 la Vina 350 23 -
Cal Am - Raymond 343 197 -

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 Madera County? ▼
Madera County has 7,852 total drinking water violations across 204 water systems, of which 3,406 are health-based violations. 91.7% of systems have at least one violation.
How many people get water from Madera County systems? ▼
Water systems in Madera County serve approximately 181,924 people through 204 public water systems.
Has PFAS been detected in Madera County water? ▼
Of 7 water systems tested for PFAS in Madera County, 4 had PFAS detected (57.1% detection rate).
What types of water sources supply Madera County? ▼
Water systems in Madera 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. 43.4% of Madera 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.