La Paz County, Arizona
9 ZIP codes · Avg score 66/100 · Grade C · Updated 2026-06-04
Compared to top-scoring counties, La Paz County's 9 ZIP codes land in the middle tier — some meet standards cleanly, others carry documented violations, and the gap between the best and worst areas is wider than average.
How La Paz County Compares
How La Paz County Compares
La Paz County scores 2 points above the Arizona state average (64/100) and 2 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: La Paz County, Arizona
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 17 (asthma 10.6%, diabetes 17.5%)
Estimated additional annual cost per homeowner: $731, driven primarily by flood
Infrastructure: 0.371% avg pipe failure probability, 22% of ZIPs at high risk
56.9% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across La Paz County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 10 violations. Past 5 years: 35 total (35 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: $731
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
13,692 housing units in La Paz 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 La Paz County
Remediation costs are relatively manageable for most homeowners in La Paz 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 La Paz 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 La Paz County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Cibola Water Improvement District | 197 | 83 |
| 2 | Ehrenberg Improvement District | 989 | 83 |
| 3 | Quartzsite Town of | 2,761 | 33 |
| 4 | Bouse Dwid | 284 | 25 |
| 5 | Cs Q Mountain Water Company | 1,224 | 22 |
15 total water systems serve La Paz County.
All ZIP Codes in La Paz County
9 ZIP codes tracked in La Paz County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 85357 | Wenden | 82 | B | 3 | — |
| 2 | 85334 | Ehrenberg | 80 | B | 7 | — |
| 3 | 85344 | Parker | 66 | C | 11 | $173K |
| 4 | 85346 | Quartzsite | 66 | C | 11 | $79K |
| 5 | 85348 | Salome | 65 | C | 19 (6 health) | $99K |
| 6 | 85325 | Bouse | 63 | C | 25 (7 health) | $124K |
| 7 | 85359 | Quartzsite | 62 | C | 11 | — |
| 8 | 85328 | Cibola | 58 | C | 76 (10 health) | $38K |
| 9 | 85371 | Poston | 53 | D | 0 | — |
Recommended Buyer Guides for La Paz County
Retailer arrangements don't shape what appears here — the selection logic is independent, filtered against EPA detections and the federal hazard data on file for this county.
- Best Lead Paint Test Kits — 56.9% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for La Paz County, Arizona
Overview
La Paz County in Arizona covers 9 ZIP codes with an average Home Safety Score of C (66/100).
8 of 9 ZIP codes have recorded EPA violations. 23 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.