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Counties → California

Madera County, California

SDWIS compliance plate

Sheet CA039 · Madera County 204 sys · 7,852 viol · #361/3254

VIOL-SEVERE · HEALTH-MID · RANK-TOP · PHOTO-FINISH · PFAS-MID · SRC-GW · SYS-LARGE · BOOK-FULL

  • VIOL-SEVERE 91.7% flagged
  • HEALTH-MID 43.4% health
  • RANK-TOP #361/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-MID 42.9% detect
  • SRC-GW GW lead 96%
  • SYS-LARGE 204 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Santa Clara County ( -0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Madera County ranks #361 of 3,254 counties by people served, and #32 of 58 counties in California. See methodology · corpus placement.

Madera County standing, lower-flagged corpus third

Flagged-system rate 91.7% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 43.4% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 42.9% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #361 of 3,254 · #32 of 58 in California.

Flagged-rate neighbourhood around Madera County

Lowest/highest poles plus in-state counties nearest Madera County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Alpine · lowest San Bernardino · near Madera · this county Sutter · highest 70% 91.4% 91.5% 91.6% 91.7% 91.9% 97.1%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

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 -

Compare beyond California

Lower-flagged peers for Madera County

Cross-state counties nearest Madera County on flagged-system share (91.7%) and cumulative violation count (7,852). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - 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

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.