How many water violations are in Yuma County?

Yuma County has 16,217 total drinking water violations across 51 water systems, of which 2,576 are health-based violations. 94.1% of systems have at least one violation.

How many people get water from Yuma County systems?

Water systems in Yuma County serve approximately 217,720 people through 51 public water systems.

Has PFAS been detected in Yuma County water?

Under EPA UCMR5, 1 of 7 tested systems in Yuma County had at least one PFAS detection (14.3% of the UCMR5-tested subset - not of all 51 SDWIS systems).

What types of water sources supply Yuma County?

Water systems in Yuma County use GW (40 systems), SW (11 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. 15.9% of Yuma County's violations are health-based. Among counties with any SDWIS violations, this extract puts Yuma County in the middle health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Yuma County ranks #312 of 3,254 counties by people served, and #6 of 15 counties in Arizona. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Arizona

Yuma County, Arizona

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet AZ027 · Yuma County 51 sys · 16,217 viol · #312/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · BELOW-PEER · PFAS-LOW · SRC-GW · SYS-MID · BOOK-FULL

VIOL-SEVERE 94.1% flagged
HEALTH-LOW 15.9% health
RANK-TOP #312/3254
BELOW-PEER 1.6 pp cleaner
PFAS-LOW 14.3% detect
SRC-GW GW lead 78%
SYS-MID 51 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Apache County (+ 1.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Yuma County ranks #312 of 3,254 counties by people served, and #6 of 15 counties in Arizona. See methodology · corpus placement.

Yuma County standing, mid-flagged corpus third

Flagged-system rate 94.1% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 15.9% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 14.3% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #312 of 3,254 · #6 of 15 in Arizona.

Water Systems

System Name	Population	Violations	PFAS
City of Yuma	103,264	456	Clean
San Luis City Of	39,705	682	Clean
Foothills Water and Sewer LLC	32,425	1,945	Clean
Somerton City Of	14,197	190	Clean
Usmc Yuma Main System	6,324	350	Detected
Aspc Yuma	4,197	441	Clean
Wellton Town Of	3,000	929	-
Howard Cantonment Area	1,500	164	-
Adot Mohawk Ra	900	67	-
Walker Cantonment Area	888	295	-
Sierra Pacific Mobile Manor	816	366	-
Yuma Lakes Resort	652	370	-
Cs Tierra Mesa Estates Water Company	632	284	Clean
Cs Gadsden Water Company	540	214	-
Tacna Water Improvement District	500	0	-
Laguna Mobile Home and RV Park	450	388	-
Shepard Water Company	430	344	-
Orange Grove Elementary School	425	65	-
Cs El Prado Water Company	404	461	-
Fishers Landing Resort	402	382	-
Del Pueblo RV Park Tennis Resort	400	104	-
Yuma Regional Medical Center	400	0	-
Kofa Cantonment Area	390	236	-
Antelope Union High School	375	476	-
Rocking K RV	366	82	-
Gowan Milling LLC	350	79	-
Hidden Shores RV Village	324	339	-
Dateland Public Service Co	319	227	-
Blue Sky RV Park	300	53	-
Kofa Co-Op	300	61	-
Cs Mohawk Utility Company	243	1,140	-
Lost Traveler RV Park	200	100	-
Yuma Desalting Project	200	190	-
Rancho Bonito RV Park	200	54	-
Mohawk Valley School District	171	1,438	-
Antelope Water Company	163	388	-
Dateland Elementary School	160	104	-
Ligurta Stat Restaurant	150	75	-
Sun Leisure Estates Improvement District	143	370	-
Dateland Travel Center	135	135	-
Cs Rancheros Bonitos Water Company	120	299	-
Cs Green Acres Water Company	105	267	-
Cs Citrus Park Water Company	102	299	-
Usmc Air Station - Cannon Complex	100	109	-
G & L Mobile Park	90	263	-
Mountain View Mobile Village	75	194	-
River RV Ranch	71	199	-
Jones Coop Water Assoc	35	363	-
Yuma West MHP	30	156	-
Aps - Yucca Water	27	24	-

Compare beyond Arizona

Mid-flagged peers for Yuma County

Cross-state counties nearest Yuma County on flagged-system share (94.1%) and cumulative violation count (16,217). 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.