PlainWater
Counties → Arizona

Maricopa County, Arizona

Water Systems
215
Population Served
4,392,896
Total Violations
30,745
1,092 health-based
PFAS Detected
42
of 42 tested

Violation Analysis

97.2%
Systems with Violations
143.0
Avg Violations per System
3.6%
Health-Based Violations

Water Source Types

GW
29 systems (13%)
SW
21 systems (10%)

PFAS Contamination

42
Systems Tested
42
PFAS Detected
100.0%
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

Maricopa Arizona water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (50)

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
Phoenix City Of 1,695,000 84 Detected
Mesa City Of 466,000 1,739 Detected
Gilbert, Town Of 247,600 1,235 Detected
Chandler City Of 247,328 851 Detected
Scottsdale City Of 241,361 963 Detected
Glendale City Of 234,766 645 Detected
Peoria City Of 187,676 2,461 Detected
Tempe City Of 165,000 339 Detected
Epcor - Agua Fria 127,718 525 Clean
Queen Creek Town Of 95,502 494 Clean
Avondale City Of 83,001 242 Detected
Liberty Water Lpsco 50,770 271 Detected
Goodyear Water Department 50,001 351 Detected
Surprise City of - Mountain Vista 40,007 419 Clean
El Mirage City Of 39,884 1,007 Detected
Epcor - Sun City 38,016 308 Clean
City of Buckeye - Valencia Town Division 30,377 341 Clean
Epcor - Chaparral City 26,026 492 Clean
Epcor - Sun City West 25,796 110 Clean
Desert Oasis 23,963 54 Clean
Epcor - Anthem 23,826 160 Clean
Pima Utilities 20,000 259 Clean
Arizona Water Co - White Tanks 18,858 26 Detected
City of Buckeye Sonora - Sundance 15,783 137 Clean
Epcor - North East Agua Fria 14,723 49 Clean
Epcor - Paradise Valley/Scottsdale 14,107 94 Clean
Festival Ranch 10,313 52 Clean
City of Buckeye Tartesso Water System 10,123 62 -
Tolleson City Of 9,300 120 Detected
Beardsley Water Company 1 9,002 95 Clean
Usaf Luke Air Force Base 8,440 759 Detected
Buckeye City Of 7,008 262 Clean
Sunrise Water Company 6,490 62 Clean
Wickenburg Town Of 6,481 233 Clean
Rose Valley Water Company 6,202 55 Clean
Valley Utilities Water Company Glendale 5,940 72 Detected
Cave Creek Water 5,895 258 Clean
Epcor- Rio Verde 5,330 141 Clean
Epcor - Tierra del Rio 4,868 3 Clean
Phoenix International Raceway 4,500 66 Detected
Aspc Lewis Complex Water System 4,300 594 Clean
Desert Hills Water 4,220 125 Clean
Carefree Water Company 3,894 52 Clean
Palo Verde Nuclear Generating Station 3,000 40 -
McPrd - Lake Pleasant 2,950 16 -
Chandler Heights Citrus Irrigation Dist 2,620 86 -
Clearwater Utility Company Inc 2,175 307 -
Gila Bend Town Of 1,922 282 -
Sheraton Phoenix Downtown 1,804 44 -
Ruth Fisher School 1,800 100 -

Other Counties in Arizona

Pima County
195 systems · 1,138,545 served · 30,465 violations
Pinal County
94 systems · 505,241 served · 20,790 violations
Mohave County
119 systems · 231,271 served · 20,586 violations
Yavapai County
238 systems · 223,192 served · 25,793 violations
Yuma County
51 systems · 217,720 served · 16,217 violations
Coconino County
116 systems · 180,537 served · 13,681 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Maricopa County? ▼
Maricopa County has 30,745 total drinking water violations across 215 water systems, of which 1,092 are health-based violations. 97.2% of systems have at least one violation.
How many people get water from Maricopa County systems? ▼
Water systems in Maricopa County serve approximately 4,392,896 people through 215 public water systems.
Has PFAS been detected in Maricopa County water? ▼
Of 42 water systems tested for PFAS in Maricopa County, 42 had PFAS detected (100.0% detection rate).
What types of water sources supply Maricopa County? ▼
Water systems in Maricopa County use GW (29 systems), SW (21 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. 3.6% of Maricopa 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.