How many water violations are in Fresno County?

Fresno County has 11,624 total drinking water violations across 340 water systems, of which 5,309 are health-based violations. 92.6% of systems have at least one violation.

How many people get water from Fresno County systems?

Water systems in Fresno County serve approximately 1,053,609 people through 340 public water systems.

Has PFAS been detected in Fresno County water?

Under EPA UCMR5, 7 of 20 tested systems in Fresno County had at least one PFAS detection (35.0% of the UCMR5-tested subset - not of all 340 SDWIS systems).

What types of water sources supply Fresno County?

Water systems in Fresno County use GW (302 systems), SW (38 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. 45.7% of Fresno County's violations are health-based. Among counties with any SDWIS violations, this extract puts Fresno County in the higher health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

Where does Fresno County sit among U.S. counties for water-system population?

According to EPA SDWIS county population served used on /counties, Fresno County ranks #52 of 3,254 counties by people served, and #9 of 58 counties in California. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → California

Fresno County, California

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet CA019 · Fresno County 340 sys · 11,624 viol · #52/3254

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

VIOL-SEVERE 92.6% flagged
HEALTH-HIGH 45.7% health
RANK-TOP #52/3254
PHOTO-FINISH ±0.1 pp
PFAS-MID 35.0% detect
SRC-GW GW lead 89%
SYS-LARGE 340 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Tuolumne County ( -0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Fresno County ranks #52 of 3,254 counties by people served, and #9 of 58 counties in California. See methodology · corpus placement.

Fresno County standing, lower-flagged corpus third

Flagged-system rate 92.6% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 45.7% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 35.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #52 of 3,254 · #9 of 58 in California.

Water Systems

System Name	Population	Violations	PFAS
City of Fresno	545,716	33	Detected
City of Clovis	130,130	14	Detected
California State University Fresno	41,000	4	Detected
Cws - Selma	26,517	2	Clean
City of Sanger	26,357	18	Detected
Reedley, City Of	26,076	26	Clean
Bakman Water Company	17,393	14	Clean
Coalinga-City	17,277	77	Clean
Kerman, City Of	17,256	26	Clean
Pinedale County Water District	16,736	33	Detected
City of Parlier	14,576	32	Clean
Kingsburg, City Of	13,540	35	Clean
Mendota, City Of	11,404	29	Clean
City of Orange Cove	9,525	37	Clean
Huron, City Of	9,306	117	Clean
Firebaugh City	8,096	25	Clean
City of Fowler	7,448	21	Detected
Cherry Auction	7,000	10	-
Malaga County Water District	5,979	36	Clean
Camp Fresno Water System	5,600	59	-
San Joaquin, City Of	4,060	39	Clean
Wild Water Adventures	3,000	19	-
Nps-Grant Grove	2,950	9	-
Nps-Sheep Creek	2,900	10	-
Riverdale Public Utility District	2,756	126	-
Fcwwd 41/Shaver Lake	2,722	36	-
Caruthers Comm Serv Dist	2,613	140	-
Selma High School	2,225	29	-
Fcsa 47 - Quail Lake Estates	1,988	14	-
Harris Ranch Restaurant	1,750	174	-
Biola Community Services Dist	1,623	61	-
Hume Lake Christian Camps, Inc	1,519	7	-
Del Rey Community Serv Dist	1,491	20	-
Usfs/Dinkey Creek Campground	1,400	27	-
Countryside Care Center	1,274	21	-
Shant Bhavan Punjabi Funeral Home	1,200	9	-
Laton Community Services District	1,151	19	Detected
Fcsa 34 - Millerton New Town	1,117	54	-
Harris Ranch Beef Co	1,009	4	-
Easton Authority Jpa	1,000	44	-
Usfs/Rancheria Campground	906	13	-
Usfs/Dorabelle Campground	900	14	-
Sierra Cedars Csd	850	27	-
Shaver Lake Heights MWC	836	60	-
Western Valley Meat Company	815	55	-
Tranquillity Irrigation District	807	96	-
Fcwwd 18/Friant	772	50	-
Central High School West	758	11	-
Usfs/Deer Creek Campground	750	11	-
Sun Maid Growers of California	750	25	-

Compare beyond California

Lower-flagged peers for Fresno County

Cross-state counties nearest Fresno County on flagged-system share (92.6%) and cumulative violation count (11,624). 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

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

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.