F0/100

WINSLOW CITY OF — Water Quality Report 2026

Serving 9,789 people · Arizona

Water Source

Groundwater

County

—

System ID

AZ0409035

Violations

192

Contaminant Test Results

EPA Violation History

Violations (last 5yr)

Unresolved

Health-Related

TIER 3Unresolved

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, 2025 – April 30, 2025Rule: Stage 1 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov

TIER 3Unresolved

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: January 1, 2025 – December 31, 2025Rule: Stage 2 DBPRVerify on EPA.gov

TIER 3Unresolved

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: January 1, 2025 – December 31, 2025Rule: Stage 2 DBPRVerify on EPA.gov

TIER 3Unresolved

Surface water treatment technique failure

When: October 2, 2024Enforcement: Informal — resolved cooperativelyVerify on EPA.gov

TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: August 8, 2024Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov

TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: August 8, 2024Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov

TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2024 – June 30, 2024Enforcement: 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: April 1, 2023 – June 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: April 1, 2023 – June 30, 2023Enforcement: 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: January 1, 2023 – March 31, 2023Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway

TIER 3Unresolved

Monitoring / Reporting Violation

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

When: January 1, 2023Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov

TIER 3Resolved

Surface water treatment technique failure

When: October 2, 2022 – August 24, 2023Enforcement: Resolving — corrective action underway

TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2022 – August 24, 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

Frequently Asked Questions About WINSLOW CITY OF

Is WINSLOW CITY OF water safe to drink?

WINSLOW CITY OF water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 192 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has WINSLOW CITY OF detected?

31 contaminants were tested in WINSLOW CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.

Does WINSLOW CITY OF have any EPA violations?

Yes, WINSLOW CITY OF has 192 EPA violation(s) on record, with the most recent in 2025. Violation types include MR, Other, RPT. 5 are health-based violations.

How many people does WINSLOW CITY OF serve?

WINSLOW CITY OF serves approximately 9,789 people, Arizona. The system provides water to 1 community: Winslow.

What type of water does WINSLOW CITY OF provide?

WINSLOW CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is AZ0409035.

How does WINSLOW CITY OF compare to other utilities in Arizona?

WINSLOW CITY OF scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Arizona state page for a full comparison of water systems.

Cities Served

Winslow