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.

Data: EPA SDWIS

Overview

We track home safety data for 4 ZIP codes in Maricopa, Arizona (population ~71,864), covering 8 community water systems serving approximately 222,900 people region-wide. The EPA snapshots used for this build directly map water systems to 2 of 4 ZIP codes.

2 of 2 ZIP codes with a reported violation count in the available EPA record (100%) have recorded EPA violations. 34 health-based violations appear in the available health breakdown.

Home Safety Score

Average Home Safety Score for Maricopa: C (58/100)

Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:

Factor	What It Measures
Water Quality	EPA violations and compliance history
PFAS MCL Screen	UCMR 5 testing against the covered federal MCLs
Radon Risk	EPA radon zone classification
Annual AQI	EPA AirData county-year median with at least 90 observed days

Water Sources

Maricopa water systems draw from: Groundwater, Surface water.

Lead & Copper

• Average lead level (90th percentile): 0.0000 mg/L (EPA action level: 0.015 mg/L)
• 0 of 2 ZIP codes with known status 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

Areas with Most Violations

All ZIP Codes in Maricopa

• 85138 [C] - 96 violations ⚠
• 85139 [C] - 166 violations ⚠
• 85238
• 85239

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

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

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.

Median Home Value

$342,900

Est. Remediation

$2,300

Remediation as % of home value 0.7%

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: NFIP Claim Records and Water-Quality Context

14

Total FEMA Flood Claims

$6,419

Avg Reported Sum With Payment Data

33%

A/V Share of Claim-Record ZIPs

Historical NFIP data for Maricopa contains 14 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $6,419. Among ZIP codes with claim records, 33% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.

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. The <strong>$2,300</strong> remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.

Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.

Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.