Water Quality in Maricopa, AZ: 175 Violations - Grade N/A
8 water systems · 2 directly mapped ZIP records
Available EPA records report 175 violations across 2 directly mapped ZIP records with known counts for Maricopa. This is compliance evidence, not a property-level tap-water verdict.
Data: EPA Safe Drinking Water Information System (SDWIS)
Water Quality by ZIP Code in Maricopa
This table shows typed EPA water evidence only. Missing violation counts are displayed as N/A, not zero.
| ZIP Code | Violations | Health | |
|---|---|---|---|
| 85139 | 166 | 29 | View report → |
| 85138 | 96 | 8 | View report → |
Violation Trend
EPA violations recorded for water systems serving Maricopa.
| Year | Total violations | Health-based |
|---|---|---|
| 2021 | 5 | 5 |
| 2022 | 4 | 4 |
| 2023 | 4 | 4 |
| 2024 | 9 | 9 |
| 2025 | 8 | 8 |
| 2026 | 2 | 2 |
Water Quality Overview
Maricopa, Arizona has directly mapped EPA water-system data for 2 ZIP codes. This page reports typed compliance facts and does not relabel the multi-source Home Safety Score as a drinking-water grade.
The available EPA records report 175 violations, including 34 health-based violations across 2 directly mapped ZIP records with reported counts.
Lead Levels
The average 90th percentile lead level across Maricopa water systems is 0.0000 mg/L - within EPA limits. No exceedances appear among the 2 ZIP records with known lead status.
Water Systems Serving Maricopa
Maricopa is served by 8 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 71,864 people across 4 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 20 enforcement actions against water systems serving Maricopa. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Maricopa
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels and violation history
Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Maricopa Water Systems
The following contaminants have been detected or caused violations across Maricopa's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Lead | Inorganic | 0.015 mg/L | 25 | 2 | Yes |
| Lead and Copper Rule | Treatment Technique | N/A | 18 | 2 | No |
| Stage 2 DBP Rule | Treatment Technique | N/A | 12 | 2 | Yes |
| Barium | Inorganic | 2 mg/L | 11 | 2 | Yes |
| Total Coliform | Microbiological | N/A | 7 | 2 | No |
| Revised Total Coliform Rule | Microbiological | N/A | 6 | 2 | No |
| Nickel | Inorganic | 0.1 mg/L | 5 | 2 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 5 | 2 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 5 | 2 | No |
| Cadmium | Inorganic | 0.005 mg/L | 4 | 2 | No |
| Chromium | Inorganic | 0.1 mg/L | 4 | 2 | No |
| Fluoride | Inorganic | 4 mg/L | 4 | 2 | No |
| Selenium | Inorganic | 0.05 mg/L | 4 | 2 | No |
| Nitrite | Inorganic | 1 mg/L | 4 | 2 | No |
| Mercury | Inorganic | 0.002 mg/L | 4 | 2 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Maricopa:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2021 | 5 | 5 |
| 2022 | 4 | 4 |
| 2023 | 4 | 4 |
| 2024 | 9 | 9 |
| 2025 | 8 | 8 |
| 2026 | 2 | 2 |
Violations have decreased from 5 in 2021 to 2 in 2026, indicating improving compliance.
EPA Enforcement History
The EPA and state regulators have taken 15 enforcement actions against water systems serving Maricopa. Recent actions:
| Date | Action Type |
|---|---|
| 2026-02-06 | State Informal Enforcement |
| 2026-01-30 | State Informal Action |
| 2026-01-30 | State Informal Enforcement |
| 2026-01-29 | State Informal Action |
| 2026-01-26 | State Informal Action |
| 2026-01-23 | State Informal Enforcement |
| 2026-01-20 | State Informal Action |
| 2026-01-20 | State Informal Enforcement |
| 2026-01-16 | State Informal Action |
| 2026-01-14 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2026-02-06.
Maricopa vs. Nearby Arizona Cities
How Maricopa's water quality compares to similar cities in Arizona:
| City | Direct EPA ZIPs | Violations | Systems | Population |
|---|---|---|---|---|
| Maricopa | 2 | 175 | 8 | 71,864 |
| Casa Grande | 3 | 72 | 5 | 71,194 |
| Prescott | 4 | 83 | 8 | 65,412 |
| Lake Havasu City | 3 | 21 | 3 | 61,852 |
Common Questions About Maricopa Water
These are the most common questions residents search for about water quality in Maricopa, Arizona:
Is Maricopa water hard or soft? Water hardness varies by source. Maricopa's 8 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Maricopa tap water? City-level EPA records cannot determine safety at a specific tap. The measured subset contains 34 health-based violations; check the affected utility record and consider certified testing.
What is the best water filter for Maricopa? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Maricopa vs. Arizona Average
Understanding how Maricopa compares to the broader Arizona average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Maricopa.
ZIP Codes in Maricopa
Maricopa spans 4 ZIP codes. EPA water-system coverage is available for 2 directly mapped ZIP codes. Check each ZIP code for detailed contaminant data, violation history, and system information.
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
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Source reporting periods vary. See each cited source for its publication schedule.