Cochise County, Arizona
29 ZIP codes · Avg score 72/100 · Grade B · Updated 2026-06-03
In current tracking cycles, Cochise County — spanning 29 ZIP codes — records above-average water quality outcomes; the county's compliance history over recent years shows few departures from federal standards.
How Cochise County Compares
How Cochise County Compares
Cochise County scores 8 points above the Arizona state average (64/100) and 4 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Cochise County, Arizona
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.5 (asthma 10.4%, diabetes 13.6%)
Estimated additional annual cost per homeowner: $1,644, driven primarily by wildfire
Infrastructure: 0.345% avg pipe failure probability, 14% of ZIPs at high risk
44.8% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Cochise County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 58 violations. Past 5 years: 119 total (119 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: $1,644
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
74,560 housing units in Cochise 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 Cochise County
Remediation costs are relatively manageable for most homeowners in Cochise 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 Cochise 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 Cochise County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Bella Vista Water South | 2,178 | 158 |
| 2 | Pueblo Del Sol Water Company | 12,804 | 148 |
| 3 | BELLA VISTA CITY WATER SYSTEM | 20,045 | 148 |
| 4 | Arizona Water Company - Sierra Vista | 9,175 | 148 |
| 5 | Liberty Water Rio Rico | 17,960 | 148 |
44 total water systems serve Cochise County.
All ZIP Codes in Cochise County
29 ZIP codes tracked in Cochise County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 85609 | Dragoon | 82 | B | 8 (1 health) | — |
| 2 | 85644 | Willcox | 82 | B | 21 (1 health) | — |
| 3 | 85620 | Naco | 79 | B | 12 (3 health) | $74K |
| 4 | 85605 | Bowie | 78 | B | 1 (1 health) | $68K |
| 5 | 85616 | Huachuca City | 77 | B | 22 (3 health) | $158K |
| 6 | 85636 | Sierra Vista | 77 | B | 37 (6 health) | — |
| 7 | 85643 | Willcox | 77 | B | 21 (1 health) | $162K |
| 8 | 85650 | Sierra Vista | 77 | B | 37 (6 health) | $306K |
| 9 | 85603 | Bisbee | 76 | B | 10 (2 health) | $205K |
| 10 | 85607 | Douglas | 76 | B | 19 (4 health) | $134K |
| 11 | 85613 | Fort Huachuca | 76 | B | 18 (7 health) | — |
| 12 | 85630 | Saint David | 76 | B | 13 (2 health) | $149K |
| 13 | 85671 | Sierra Vista | 76 | B | 37 (6 health) | — |
| 14 | 85602 | Benson | 74 | B | 31 (6 health) | $196K |
| 15 | 85608 | Douglas | 74 | B | 19 (4 health) | — |
| 16 | 85655 | Douglas | 74 | B | 19 (4 health) | — |
| 17 | 85670 | Fort Huachuca | 74 | B | 18 (7 health) | — |
| 18 | 86555 | Douglas | 74 | B | 19 (4 health) | — |
| 19 | 85638 | Tombstone | 73 | B | 14 | $171K |
| 20 | 85625 | Pearce | 72 | B | 8 (1 health) | $159K |
| 21 | 85635 | Sierra Vista | 72 | B | 37 (6 health) | $218K |
| 22 | 85627 | Pomerene | 71 | B | 14 (4 health) | $161K |
| 23 | 85610 | Elfrida | 66 | C | 13 (5 health) | $207K |
| 24 | 85606 | Cochise | 63 | C | 0 | $234K |
| 25 | 85626 | Pirtleville | 63 | C | 0 | $91K |
| 26 | 85632 | San Simon | 58 | C | 39 (20 health) | $120K |
| 27 | 85339 | Laveen | 55 | C | 0 | $398K |
| 28 | 85615 | Hereford | 55 | C | 0 | $247K |
| 29 | 85617 | Mc Neal | 53 | D | 0 | $122K |
Recommended Buyer Guides for Cochise County
Methodologically, the recommendation order reflects severity in the federal record: contaminants flagged in EPA detection records for this county outrank generic water concerns, FEMA-confirmed hazard ratings shift emergency-related categories upward, and CDC lead-exposure markers govern when lead-test kits and certified filters appear at the top of the list.
- 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 Cochise County, Arizona
Overview
Cochise County in Arizona covers 29 ZIP codes with an average Home Safety Score of B (72/100).
24 of 29 ZIP codes have recorded EPA violations. 104 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.