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Counties → Arizona

Pima County, Arizona

SDWIS compliance plate

Sheet AZ019 · Pima County 195 sys · 30,465 viol · #47/3254

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

  • VIOL-SEVERE 99.0% flagged
  • HEALTH-LOW 2.3% health
  • RANK-TOP #47/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-MID 28.6% detect
  • SRC-GW GW lead 100%
  • SYS-LARGE 195 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Pima County ranks #47 of 3,254 counties by people served, and #2 of 15 counties in Arizona. See methodology · corpus placement.

Pima County standing, mid-flagged corpus third

Flagged-system rate 99.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 2.3% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 28.6% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #47 of 3,254 · #2 of 15 in Arizona.

Flagged-rate neighbourhood around Pima County

Lowest/highest poles plus in-state counties nearest Pima County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Yuma · lowest Pima · this county Greenlee · highest Navajo · near 94.1% 98.9% 99% 99.6% 100% 100% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

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 -

Compare beyond Arizona

Mid-flagged peers for Pima County

Cross-state counties nearest Pima County on flagged-system share (99.0%) and cumulative violation count (30,465). 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

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.