TapSafetyReport
D33/100

Maricopa Tap Water Quality: Is It Safe to Drink? (2026 Report)

Serving 120,458 residents · Arizona

What's In Maricopa's Tap Water?

66
Contaminants Tested
0
Exceed EPA Limits
2
Above EPA Goals
2 contaminants above EPA health goals
ContaminantDetectedLimit (MCL)Status
strontium
2500.00 µg/L—Above Goal
chlorate
280.00 µg/L—Above Goal

EPA Violation History

17

Violations (last 5yr)

1

Unresolved

1

Health-Related

TIER 1 — URGENTUnresolved

Maximum Contaminant Level Violation

When: August 1, 2025 – August 31, 2025Rule: Total Coliform RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: July 19, 2025 – September 22, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: July 19, 2025 – September 22, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: July 19, 2025 – September 22, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: July 19, 2025 – September 22, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: April 1, 2024 – June 30, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: April 1, 2024 – June 30, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2023 – December 31, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2023 – December 31, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2023 – December 31, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2023 – December 31, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2023 – December 31, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: September 1, 2023 – September 30, 2023Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2023 – September 30, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2023 – September 30, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2023 – September 30, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2023 – September 30, 2023Enforcement: Resolving — corrective action underway

Understanding violation severity

Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.

Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly

Water Utility Details

Ak-Chin Village
Population Served

11,646

Water Source

Surface Water

System ID

090400090

GW FARMERS WATER CO - CONTINENTAL
Population Served

5,592

Water Source

Groundwater

System ID

AZ0410049

GW SAGUARO DIST WATER CO - LAS QUINTAS
Population Served

3,720

Water Source

Groundwater

System ID

AZ0410064

GW OCOTILLO WATER - CATALINA
Population Served

1,168

Water Source

Groundwater

System ID

AZ0410171

GW OCOTILLO WATER - RANCHO DEL SOL LINDO
Population Served

3,128

Water Source

Groundwater

System ID

AZ0410173

GW FARMERS WATER CO - SANTA RITA SPRINGS
Population Served

3,990

Water Source

Groundwater

System ID

AZ0410213

THUNDERBIRD FARMS DWID
Population Served

2,231

Water Source

Groundwater

System ID

AZ0411100

GW SANTA CRUZ WATER CO
Population Served

84,000

Water Source

Groundwater

System ID

AZ0411131

GW SANTA CRUZ WATER CO - RED ROCK
Population Served

3,813

Water Source

Groundwater

System ID

AZ0411160

GW SANTA CRUZ WATER - MARICOPA SW
Population Served

1,170

Water Source

Groundwater

System ID

AZ0411575

Frequently Asked Questions About Maricopa Water

Is Maricopa tap water safe to drink?

Maricopa, Arizona tap water receives a grade of D (33/100), which is considered poor. 1 contaminant(s) exceed EPA maximum contaminant levels and 821 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.

What contaminants are in Maricopa's water?

Of the 69 contaminants tested in Maricopa's water supply, the most notable include PFOS, Lead (90th percentile), strontium, chlorate. 1 contaminant(s) exceed EPA legal limits (MCLs). 4 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.

Does Maricopa have any water quality violations?

Yes, Maricopa has 821 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, Other, MON. 69 of these are health-based violations, which are the most serious category.

Do I need a water filter in Maricopa?

Based on EPA data, using a water filter in Maricopa is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.

Where does Maricopa's tap water come from?

Maricopa's drinking water is sourced from surface water and supplied by Ak-Chin Village and 9 other water system(s). The system serves approximately 120,458 people. Surface water sources include rivers, lakes, and reservoirs.

How often is Maricopa's water tested?

Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Maricopa's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.

How does Maricopa's water compare to other cities in Arizona?

Maricopa's water quality score of 33/100 earns a grade of D, which is considered poor. This is a concerning score that suggests significant water quality issues. Visit our Arizona state page to see how all cities in the state compare.

What should I do if I'm concerned about Maricopa's water quality?

If you have concerns about Maricopa's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (Ak-Chin Village) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.

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