Pima County, Arizona
72 ZIP codes · Avg score 58/100 · Grade C · Updated 2026-06-03
Pima County shows moderate water quality across its 72 ZIP codes — some areas carry violations worth monitoring.
How Pima County Compares
How Pima County Compares
Pima County scores 6 points below the Arizona state average (64/100) and 10 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Pima County, Arizona
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.2 (asthma 10.9%, diabetes 11%)
Estimated additional annual cost per homeowner: $2,851, driven primarily by wildfire
Infrastructure: 0.322% avg pipe failure probability, 20% of ZIPs at high risk
47.6% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Pima County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 66 violations. Past 5 years: 74 total (74 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $2,851
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
475,721 housing units in Pima County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Pima County
Remediation costs are relatively manageable for most homeowners in Pima County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Pima County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Pima County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Vail Water Company | 17,500 | 11795 |
| 2 | TUCSON CITY OF | 732,906 | 11795 |
| 3 | Metropolitan Dwid | 45,570 | 11772 |
| 4 | Usaf Davis Monthan Afb | 18,640 | 11772 |
| 5 | Flowing Wells Irrigation District | 16,000 | 11772 |
52 total water systems serve Pima County.
All ZIP Codes in Pima County
72 ZIP codes tracked in Pima County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 85601 | Arivaca | 83 | B | 0 | $79K |
| 2 | 85629 | Sahuarita | 80 | B | 4 | $314K |
| 3 | 85633 | Sasabe | 80 | B | 6 | — |
| 4 | 85535 | Eden | 79 | B | 35 (1 health) | — |
| 5 | 85614 | Green Valley | 79 | B | 14 (1 health) | $273K |
| 6 | 85645 | Amado | 79 | B | 14 (1 health) | $220K |
| 7 | 85246 | Chandler | 78 | B | 20 (2 health) | — |
| 8 | 85622 | Green Valley | 78 | B | 14 (1 health) | $325K |
| 9 | 85658 | Marana | 77 | B | 10 | $442K |
| 10 | 85321 | Ajo | 75 | B | 17 | $121K |
| 11 | 85619 | Mount Lemmon | 75 | B | 7 | — |
| 12 | 85641 | Vail | 74 | B | 3 (1 health) | $373K |
| 13 | 85653 | Marana | 72 | B | 10 | $298K |
| 14 | 85637 | Sonoita | 70 | B | 20 (3 health) | $434K |
| 15 | 85738 | Catalina | 70 | B | 8 | — |
| 16 | 85654 | Rillito | 65 | C | 9 (1 health) | — |
| 17 | 85652 | Cortaro | 63 | C | 0 | — |
| 18 | 85701 | Tucson | 58 | C | 218 (29 health) | $452K |
| 19 | 85704 | Tucson | 58 | C | 218 (29 health) | $389K |
| 20 | 85706 | Tucson | 58 | C | 218 (29 health) | $170K |
| 21 | 85711 | Tucson | 58 | C | 218 (29 health) | $249K |
| 22 | 85713 | Tucson | 58 | C | 218 (29 health) | $172K |
| 23 | 85714 | Tucson | 58 | C | 218 (29 health) | $177K |
| 24 | 85730 | Tucson | 58 | C | 218 (29 health) | $219K |
| 25 | 85741 | Tucson | 58 | C | 218 (29 health) | $269K |
| 26 | 85743 | Tucson | 58 | C | 218 (29 health) | $329K |
| 27 | 85746 | Tucson | 58 | C | 218 (29 health) | $225K |
| 28 | 85748 | Tucson | 58 | C | 218 (29 health) | $322K |
| 29 | 85755 | Tucson | 58 | C | 218 (29 health) | $453K |
| 30 | 85341 | Lukeville | 53 | D | 0 | — |
| 31 | 85705 | Tucson | 53 | D | 218 (29 health) | $114K |
| 32 | 85710 | Tucson | 53 | D | 218 (29 health) | $246K |
| 33 | 85712 | Tucson | 53 | D | 218 (29 health) | $250K |
| 34 | 85715 | Tucson | 53 | D | 218 (29 health) | $331K |
| 35 | 85716 | Tucson | 53 | D | 218 (29 health) | $301K |
| 36 | 85718 | Tucson | 53 | D | 218 (29 health) | $677K |
| 37 | 85719 | Tucson | 53 | D | 218 (29 health) | $267K |
| 38 | 85735 | Tucson | 53 | D | 218 (29 health) | $191K |
| 39 | 85737 | Tucson | 53 | D | 218 (29 health) | $434K |
| 40 | 85739 | Tucson | 53 | D | 218 (29 health) | $394K |
| 41 | 85742 | Tucson | 53 | D | 218 (29 health) | $339K |
| 42 | 85745 | Tucson | 53 | D | 218 (29 health) | $324K |
| 43 | 85747 | Tucson | 53 | D | 218 (29 health) | $346K |
| 44 | 85750 | Tucson | 53 | D | 218 (29 health) | $518K |
| 45 | 85756 | Tucson | 53 | D | 218 (29 health) | $211K |
| 46 | 85757 | Tucson | 53 | D | 218 (29 health) | $266K |
| 47 | 85702 | Tucson | 50 | D | 218 (29 health) | — |
| 48 | 85703 | Tucson | 50 | D | 218 (29 health) | — |
| 49 | 85707 | Tucson | 50 | D | 218 (29 health) | — |
| 50 | 85708 | Tucson | 50 | D | 218 (29 health) | — |
| 51 | 85709 | Tucson | 50 | D | 218 (29 health) | — |
| 52 | 85717 | Tucson | 50 | D | 218 (29 health) | — |
| 53 | 85720 | Tucson | 50 | D | 218 (29 health) | — |
| 54 | 85721 | Tucson | 50 | D | 218 (29 health) | — |
| 55 | 85722 | Tucson | 50 | D | 218 (29 health) | — |
| 56 | 85723 | Tucson | 50 | D | 218 (29 health) | — |
| 57 | 85724 | Tucson | 50 | D | 218 (29 health) | — |
| 58 | 85725 | Tucson | 50 | D | 218 (29 health) | — |
| 59 | 85726 | Tucson | 50 | D | 218 (29 health) | — |
| 60 | 85728 | Tucson | 50 | D | 218 (29 health) | — |
| 61 | 85731 | Tucson | 50 | D | 218 (29 health) | — |
| 62 | 85732 | Tucson | 50 | D | 218 (29 health) | — |
| 63 | 85733 | Tucson | 50 | D | 218 (29 health) | — |
| 64 | 85734 | Tucson | 50 | D | 218 (29 health) | — |
| 65 | 85736 | Tucson | 50 | D | 218 (29 health) | $140K |
| 66 | 85740 | Tucson | 50 | D | 218 (29 health) | — |
| 67 | 85744 | Tucson | 50 | D | 218 (29 health) | — |
| 68 | 85751 | Tucson | 50 | D | 218 (29 health) | — |
| 69 | 85752 | Tucson | 50 | D | 218 (29 health) | — |
| 70 | 85754 | Tucson | 50 | D | 218 (29 health) | — |
| 71 | 85775 | Tucson | 50 | D | 218 (29 health) | — |
| 72 | 85749 | Tucson | 48 | D | 218 (29 health) | $554K |
Recommended Buyer Guides for Pima County
Filtered against EPA monitoring data and CDC lead-exposure guidance, the guides below skip the generic catalog and connect directly to the contaminants and hazards on file here.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Pima County, Arizona
Overview
Pima County in Arizona covers 72 ZIP codes with an average Home Safety Score of C (58/100).
69 of 72 ZIP codes have recorded EPA violations. 1577 health-based violations have been documented.
← Back to Arizona water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.