When: November 25, 2021 – March 28, 2022Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: October 2, 2021 – October 28, 2021Enforcement: 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: October 1, 2021 – December 31, 2021Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
TIER 3Unresolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2021Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved
Monitoring violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: August 1, 2021 – October 28, 2021Rule: Total Coliform 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: July 1, 2021 – September 30, 2021Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2021 – October 27, 2021Enforcement: 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: June 1, 2021 – June 30, 2021Rule: Total Coliform RuleEnforcement: 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
Pima, Arizona tap water receives a grade of F (8/100), which is considered failing. 0 contaminant(s) exceed EPA maximum contaminant levels and 72 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Pima's water?
1 contaminants were tested in Pima's water supply. No contaminants exceed EPA legal limits (MCLs) or health goals (MCLGs), which is a positive indicator of water quality.
Does Pima have any water quality violations?
Yes, Pima has 72 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, TT, MR. 5 of these are health-based violations, which are the most serious category.
Do I need a water filter in Pima?
Pima water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. All contaminants are within health goals.
Where does Pima's tap water come from?
Pima's drinking water is sourced from groundwater and supplied by GRAHAM COUNTY UTILITIES - PIMA. The system serves approximately 3,799 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Pima'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. Pima'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 Pima's water compare to other cities in Arizona?
Pima's water quality score of 8/100 earns a grade of F, which is considered failing. 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 Pima's water quality?
If you have concerns about Pima'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 (GRAHAM COUNTY UTILITIES - PIMA) 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.