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F0/100

USMC YUMA MAIN SYSTEM — Water Quality Report 2026

Serving 6,324 people · Arizona

Water Source
Surface Water
County
—
System ID
AZ0414082
Violations
237

Contaminant Test Results

2 contaminants above EPA health goals
ContaminantDetectedLimit (MCL)Status
Copper (90th percentile)
1.80 mg/L1.30 mg/LOver Limit
Lead (90th percentile)
0.003 mg/L0.015 mg/LAbove Goal

EPA Violation History

10

Violations (last 5yr)

1

Unresolved

2

Health-Related

TIER 3Resolved

Monitoring violation

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

When: July 1, 2025 – August 12, 2025Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved

Failed to conduct Level 2 Assessment

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

When: April 1, 2025Rule: Stage 2 DBPREnforcement: 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: March 1, 2025 – April 29, 2025Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Missed required monitoring deadline

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

When: June 1, 2024 – June 30, 2024Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved

Violation related to Consumer Confidence Report

When: May 12, 2024 – May 30, 2024Rule: Consumer Confidence RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved

Violation related to Consumer Confidence Report

When: May 12, 2024 – July 23, 2024Rule: Consumer Confidence 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, 2023 – June 30, 2023Rule: Stage 1 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: January 1, 2023 – March 31, 2023Rule: 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: January 1, 2023 – March 31, 2023Rule: 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: July 1, 2022 – September 30, 2022Rule: Stage 1 DBPREnforcement: 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 USMC YUMA MAIN SYSTEM

Is USMC YUMA MAIN SYSTEM water safe to drink?

USMC YUMA MAIN SYSTEM water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 237 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has USMC YUMA MAIN SYSTEM detected?

35 contaminants were tested in USMC YUMA MAIN SYSTEM's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).

Does USMC YUMA MAIN SYSTEM have any EPA violations?

Yes, USMC YUMA MAIN SYSTEM has 237 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, MR, TT. 7 are health-based violations.

How many people does USMC YUMA MAIN SYSTEM serve?

USMC YUMA MAIN SYSTEM serves approximately 6,324 people, Arizona. The system provides water to 1 community: Yuma.

What type of water does USMC YUMA MAIN SYSTEM provide?

USMC YUMA MAIN SYSTEM sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is AZ0414082.

How does USMC YUMA MAIN SYSTEM compare to other utilities in Arizona?

USMC YUMA MAIN SYSTEM 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

Yuma