How many water violations are in Pinal County?

Pinal County has 20,790 total drinking water violations across 94 water systems, of which 2,576 are health-based violations. 98.9% of systems have at least one violation.

How many people get water from Pinal County systems?

Water systems in Pinal County serve approximately 505,241 people through 94 public water systems.

Has PFAS been detected in Pinal County water?

Under EPA UCMR5, 4 of 16 tested systems in Pinal County had at least one PFAS detection (25.0% of the UCMR5-tested subset - not of all 94 SDWIS systems).

What types of water sources supply Pinal County?

Water systems in Pinal County use GW (93 systems), SW (1 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. 12.4% of Pinal County's violations are health-based. Among counties with any SDWIS violations, this extract puts Pinal County in the middle health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Pinal County ranks #140 of 3,254 counties by people served, and #3 of 15 counties in Arizona. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Arizona

Pinal County, Arizona

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet AZ021 · Pinal County 94 sys · 20,790 viol · #140/3254

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

VIOL-SEVERE 98.9% flagged
HEALTH-LOW 12.4% health
RANK-TOP #140/3254
PHOTO-FINISH ±0.0 pp
PFAS-MID 25.0% detect
SRC-GW GW lead 99%
SYS-MID 94 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Pima County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Pinal County ranks #140 of 3,254 counties by people served, and #3 of 15 counties in Arizona. See methodology · corpus placement.

Pinal County standing, mid-flagged corpus third

Flagged-system rate 98.9% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 12.4% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 25.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #140 of 3,254 · #3 of 15 in Arizona.

Water Systems

System Name	Population	Violations	PFAS
Arizona Water Co - Pinal Valley	134,432	590	Detected
Epcor - San Tan	87,435	367	Clean
Gw Santa Cruz Water Co	84,000	256	Clean
Arizona Water Co - Apache Junction	62,055	88	Clean
Lago del Oro Water Company	18,132	777	Detected
Florence Water Company	15,900	272	Detected
Apache Junction Water District	15,610	694	Clean
Arizona Water Co - Oracle	10,585	18	Clean
Epcor - San Tan Anthem	10,362	55	Detected
Cca - Eloy Complex	8,852	196	Clean
Eloy City Of	7,903	313	Clean
Arizona Water Co - San Manuel	4,748	38	Clean
Arizona Water Co - Superior	4,393	158	Clean
Adoc Eyman Unit	3,969	865	Clean
Gw Santa Cruz Water Co - Red Rock	3,813	32	-
Goodman Water Company	2,656	53	-
Picacho Water Company	2,440	70	-
Thunderbird Farms Dwid	2,231	484	-
Kearny Town Of	1,950	158	-
Arizona Water Co - Tierra Grande	1,796	23	-
Queen Valley Dwid	1,200	182	-
Mammoth Town Of	1,181	153	-
Gw Santa Cruz Water - Maricopa SW	1,170	2	-
Copper Mountain Ranch Cfd	1,071	370	Clean
Adoc Florence Asp	1,001	699	Clean
Awc - Casa Grande West Water Company	943	391	-
Maricopa Consolidated Dwid	928	141	-
Pinal County Justice Complex	820	19	-
Arizona Water Co - Stanfield	639	88	-
Tonto Basin Water - Cactus Forest	613	84	-
Sun Valley Farms Unit VI	600	268	-
Desert Gardens RV Resort Co-Op, Inc	532	110	-
Papago Butte Dwid	530	629	-
Town of Florence - Rodeo Well	500	0	-
Silver Bell Army Heliport	500	144	-
Arizona Training Program	470	812	-
Maricopa Mountain Dwid 1	450	476	-
Goldfield Ghost Town	450	11	-
Park Water Company Inc	416	177	-
Valle Escondido	405	105	-
Marana Aerospace Solutions	400	198	-
Picacho Peak RV Resort	400	53	-
Silverbell Irrigation & Drainage Dist	375	266	-
Skyline Resort RV Park	375	221	-
Picacho Dwid	340	471	-
Jo Combs Elementary School	325	205	-
Resolution Copper Company	300	138	-
Villa Grande Dwid	283	459	-
Sunland Water Company	227	149	-
Arizonian RV Resort	225	122	-

Compare beyond Arizona

Mid-flagged peers for Pinal County

Cross-state counties nearest Pinal County on flagged-system share (98.9%) and cumulative violation count (20,790). 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.