Maricopa, AZ: 108 Health Violations — 56/100 (2026)
4 ZIP codes · 9 water systems · Updated 2026-06-03
Although much of Maricopa meets baseline drinking water standards, some AZ-tracked service areas show violations that merit a closer look — particularly for older housing stock.
How Maricopa Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Maricopa Residents
- Your city's water systems recorded 288 violations in the past 5 years.
- Average lead level: 0.0008 mg/L.
- Estimated remediation: $2,300 per household.
- CDC health risk index: 13.46 — above typical levels.
Maricopa's Water Providers
Multiple utilities divide Maricopa, AZ's water service — 3 leading providers among 9 on the federal register.
Overview
We track water quality and home safety data for 4 ZIP codes in Maricopa, Arizona (population ~71,864), covering 9 community water systems serving approximately 286,118 people region-wide.
4 of 4 ZIP codes (100%) have recorded EPA violations. 108 health-based violations documented.
Home Safety Score
Average Home Safety Score for Maricopa: C (56/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Maricopa water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0008 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 4 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Lead | Inorganic | 110 | 4 |
| Consumer Confidence Report Rule | Reporting | 65 | 4 |
| Revised Total Coliform Rule | Microbiological | 50 | 4 |
| Lead and Copper Rule | Treatment Technique | 40 | 4 |
| Combined Radium | Radionuclides | 20 | 4 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 85138 | C | 72 | 27 | Gw Santa Cruz Water Company |
| 85139 | C | 72 | 27 | Gw Santa Cruz Water Company |
| 85238 | D | 72 | 27 | Gw Santa Cruz Water Company |
| 85239 | C | 72 | 27 | Gw Santa Cruz Water Company |
All ZIP Codes in Maricopa
- 85138 [C] — 72 violations ⚠
- 85139 [C] — 72 violations ⚠
- 85238 [D] — 72 violations ⚠
- 85239 [C] — 72 violations ⚠
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Maricopa Community Health Snapshot
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
What's in Maricopa's Water?
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Remediation Costs Compare in Maricopa
What does remediation cost in financial context for Maricopa homeowners? Proportionally very little — the equity share here is low, and addressing documented issues is a manageable planning question rather than a material financial burden.
Remediation costs in Maricopa are relatively low compared to home values. The $1,150–$4,225 estimated range is a small fraction of median property value. Home values are 12% above the Arizona average.
Maricopa: Lead Risk & Vulnerable Populations
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Lead risk in Maricopa appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Maricopa: Flood History & Water Damage Risk
75% of ZIP codes in Maricopa are mapped into FEMA-designated flood zones, and the NFIP records 14 claims reflecting a multi-event flood history. That combination places local flood exposure in the range where water-quality implications deserve at least periodic attention.
Maricopa has a moderate flood history with 14 FEMA claims averaging $3,614 per payout. 75% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,300</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Maricopa
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Lead can reduce the most common contaminant found in Maricopa's water.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
Deep Dive Reports
Detailed analysis for Maricopa, AZ