State Hub
Arizona Water Quality
333
Utilities in database
7.2M
Residents served
2
With open violations
144
PFAS monitored
Quick Answer
Arizona public drinking water is served by 333 EPA-tracked water systems, providing service to approximately 7.2 million residents through public utilities. 2 of those systems currently have open health-based violations on record in the EPA federal database. 144 systems have official PFAS monitoring records from the EPA UCMR 5 program (2023–2025). About 18% of AZ residents use private wells, which fall outside federal utility compliance monitoring.
2 Arizona water systems have open health-based violations recorded in EPA SDWIS. An open violation means a contaminant exceeded a federal limit and the violation has not been formally resolved in the federal database. Check individual utility pages for current status.
Open Health-Based Violations in Arizona
Records sourced from EPA SDWIS. A record may be under review or resolved at the utility level but not yet updated in federal records. Water Utility Report does not determine whether water is safe to drink.
Drinking Water in Arizona
Arizona's water supply depends heavily on the Colorado River (delivered via the Central Arizona Project) and local groundwater. Naturally occurring arsenic is a significant issue in rural areas — Arizona has some of the highest naturally occurring arsenic levels in the U.S. Hard water and PFAS contamination near military installations are also documented. ADEQ holds primary enforcement authority.
Highest Risk Utilities
Arizona systems with open health-based violations in EPA records.
Safest Large Utilities
Arizona systems with no open health violations serving 10,000+ residents.
Utilities in Arizona
1–25 of 333City of Phoenix
AZ0407025 · 1,695,000 served
City of Tucson
AZ0410112 · 732,906 served
City of Mesa
AZ0407095 · 466,000 served
Town of Gilbert
AZ0407092 · 247,600 served
City of Chandler
AZ0407090 · 247,328 served
City of Scottsdale
AZ0407098 · 241,361 served
City of Glendale
AZ0407093 · 234,766 served
City of Peoria
AZ0407096 · 187,676 served
City of Tempe
AZ0407100 · 165,000 served
Arizona Water Co - Pinal Valley
AZ0411009 · 134,432 served
Epcor - Agua Fria
AZ0407695 · 127,718 served
City of Yuma
AZ0414024 · 103,264 served
Town of Queen Creek
AZ0407033 · 95,502 served
Epcor - San Tan
AZ0411128 · 87,435 served
Gw Santa Cruz Water Co
AZ0411131 · 84,000 served
City of Avondale
AZ0407088 · 83,001 served
City of Flagstaff
AZ0403008 · 76,960 served
Arizona Water Co - Apache Junction
AZ0411004 · 62,055 served
Town of Prescott Valley
AZ0413048 · 57,048 served
Liberty Water Lpsco
AZ0407046 · 55,810 served
City of Lake Havasu
AZ0408022 · 54,610 served
Goodyear Water Department
AZ0407094 · 50,001 served
Metropolitan Dwid
AZ0410076 · 45,570 served
Kingman Municipal Water
AZ0408020 · 45,000 served
Oro Valley Water Utility
AZ0410164 · 42,316 served
Key Contaminant Concerns in Arizona
These contaminants appear most frequently in Arizona utility records or pose elevated risk in this region based on EPA data.
PFAS
Per- and polyfluoroalkyl substances (PFAS) are a class of over 12,000 synthetic chemicals characterized by strong carbon-fluorine bonds that resist degradation. The two most studied — PFOA (perfluorooctanoic acid) and PFOS (perfluorooctane sulfonic acid) — have been phased out of U.S. manufacturing but persist widely in the environment.
EPA limit: 4 ppt
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
EPA limit: 80 µg/L (TTHMs) / 60 µg/L (HAA5)
Arsenic
Arsenic (As) occurs naturally in rock and soil, dissolving into groundwater through natural weathering processes. Inorganic arsenic — the form found in drinking water — is a known human carcinogen. The western United States has particularly arsenic-rich geological formations, but elevated levels have been found in 48 states. Arsenic is tasteless and odorless.
EPA limit: 10 ppb
Hard Water
Water hardness is a measure of dissolved calcium (Ca²⁺) and magnesium (Mg²⁺) ions, expressed in milligrams per liter (mg/L) as calcium carbonate (CaCO₃) or grains per gallon (gpg). Water below 60 mg/L is considered soft; 61–120 mg/L is moderately hard; 121–180 mg/L is hard; above 180 mg/L is very hard. The Colorado River, which supplies water to much of the Southwest, is among the hardest source waters in the U.S.
EPA limit: No federal limit
City Water Reports in Arizona
Tap water quality pages for Arizona cities — violations, PFAS records, utility profiles, and official source links.
Independent Water Testing
Find a certified lab in Arizona
Utility compliance records show what water systems report to the EPA. An independent test from a certified laboratory confirms what's actually in your tap water. Arizona labs can test for PFAS, lead, nitrates, bacteria, and dozens of other contaminants.
Explore Water Quality in Arizona
City of Phoenix
Violation history, PFAS records, and official source links
City of Tucson
Violation history, PFAS records, and official source links
City of Mesa
Violation history, PFAS records, and official source links
PFAS monitoring records — Arizona
144 water systems in Arizona with EPA UCMR 5 records
Active drinking water violations
2 open health-based violations on record — view official EPA SDWIS data
Lead in Arizona drinking water
State-specific lead data, violation utilities, and testing guidance
PFAS in Arizona drinking water
State-specific PFAS data, MCL context, and treatment options
Certified water testing labs in Arizona
Labs certified for PFAS (EPA 533/537.1), lead, and bacteria testing
Water treatment options
Reverse osmosis, activated carbon, and filtration guides with cost ranges
Data sources and methodology
How WaterUtilityReport.com sources and validates official EPA data
Common Questions About Arizona Drinking Water
Does Arizona drinking water have PFAS?
144 Arizona water systems have EPA UCMR 5 PFAS monitoring records (2023–2025)
Which Arizona water utilities have open violations?
2 systems have open health-based violations in EPA SDWIS — search for your utility
How do I test my water in Arizona?
State-certified labs for PFAS (EPA 533/537.1), lead, nitrate, and bacteria testing
What treatment removes PFAS from AZ tap water?
Reverse osmosis removes PFAS, lead, arsenic, and nitrates — cost, maintenance, and NSF certification explained
What do Arizona PFAS records tell me about my water?
EPA limits, health context, and what UCMR 5 detection above MRL means for your water
How is Arizona water quality data sourced here?
EPA SDWIS violations, UCMR 5 PFAS records, and CCR data — sources, accuracy notes, and limitations
Arizona Water FAQs
Data sources: Utility compliance and violation data from EPA SDWIS (Safe Drinking Water Information System). PFAS monitoring records from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule 5, 2023–2025). Contaminant data from EPA and ATSDR public references. This page summarizes public records — it is not a compliance determination. Methodology →
Last updated: 2025-01-10