PlainWater
Counties → Arizona

Pima County, Arizona

Water Systems
195
Population Served
1,138,545
Total Violations
30,465
687 health-based
PFAS Detected
28
of 28 tested

Violation Analysis

99.0%
Systems with Violations
156.2
Avg Violations per System
2.3%
Health-Based Violations

Water Source Types

GW
50 systems (26%)

PFAS Contamination

28
Systems Tested
28
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

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

No violations on record (1) One or more violations (49)

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
Tucson City Of 732,906 2,267 Detected
University of Arizona 50,000 1,168 Detected
Metropolitan Dwid 45,570 894 Detected
Oro Valley Water Utility 42,316 2,191 Clean
Community WC of Green Valley 22,085 264 Clean
Usaf Davis Monthan Afb 18,640 1,020 Clean
Sahuarita Water Company 18,178 101 Clean
Vail Water Company 17,500 173 Clean
Flowing Wells Irrigation District 16,000 936 Detected
Marana Municipal - Marana 15,162 177 Detected
Tucson Water Corona de Tucson 10,217 43 Clean
Green Valley Dwid 8,687 170 Clean
Quail Creek Water Company 6,812 68 Clean
Avra Water Coop Inc 6,685 143 Clean
Gw Farmers Water Co - Continental 5,592 159 Clean
Metropolitan Dwid - Diablo Village 5,542 116 Clean
Marana Municipal - Picture Rocks 5,278 117 Detected
Marana Municipal - Hartman Vistas 5,248 42 Detected
Marana Municipal - Airline Lambert 4,568 99 -
Oro Valley Water Countryside 4,534 143 Clean
Adoc Tucson 4,500 567 Clean
Ray Water Company Inc 4,495 151 Clean
Metropolitan Dwid - Hub 4,252 157 Clean
Gw Farmers Water Co - Santa Rita Springs 3,990 106 Detected
Spanish Trail Water Company 3,822 228 -
Gw Saguaro Dist Water Co - las Quintas 3,720 204 Clean
Saguaro Water Company 3,243 156 -
Voyager Water Company 3,209 168 Clean
Gw Ocotillo Water - Rancho del Sol Lindo 3,128 39 -
Tucson Medical Center 3,000 153 -
Ua Tech Park - Rita Road 3,000 86 Clean
Ajo Improvement Company 2,654 85 -
Cs los Cerros Water Company Inc 2,613 202 -
Marana High School 2,450 156 -
Arizona Water Co - Ajo 2,100 13 -
Marana Estes Elementary School 2,000 139 -
Marana Dwid - Derringer 1,950 287 -
Vail School District - Elementary School 1,680 77 -
Saguaro National Park 1,440 34 -
Salpointe Catholic High School 1,300 92 -
Gw Ocotillo Water - Catalina 1,168 25 -
Town & Country Estates 960 222 -
Rincon Country East RV Park 912 61 -
Rancho del Conejo Comm Water Coop 900 275 -
Metropolitan Dwid - E&t System 880 101 -
Sandario Water Company 870 45 -
Far Horizons East MHP 870 34 -
Tucson Country Day School 800 41 Clean
Organ Pipe NM Headquarters 755 90 -
Marana Municipal - Silverbell Gateway 750 0 -

Other Counties in Arizona

Maricopa County
215 systems · 4,392,896 served · 30,745 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 Pima County? ▼
Pima County has 30,465 total drinking water violations across 195 water systems, of which 687 are health-based violations. 99.0% of systems have at least one violation.
How many people get water from Pima County systems? ▼
Water systems in Pima County serve approximately 1,138,545 people through 195 public water systems.
Has PFAS been detected in Pima County water? ▼
Of 28 water systems tested for PFAS in Pima County, 28 had PFAS detected (100.0% detection rate).
What types of water sources supply Pima County? ▼
Water systems in Pima County use GW (50 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. 2.3% of Pima 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.