F0/100
Colorado River Regional Water System — Water Quality Report 2026
Serving 8,490 people · Arizona
Water Source
Groundwater
County
—
System ID
090400051
Violations
52
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
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 22, 2025Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Monitoring / Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 29, 2023 – March 19, 2024Rule: Ground Water 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
Frequently Asked Questions About Colorado River Regional Water System
Is Colorado River Regional Water System water safe to drink?
Colorado River Regional Water System water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 52 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has Colorado River Regional Water System detected?
31 contaminants were tested in Colorado River Regional Water System's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does Colorado River Regional Water System have any EPA violations?
Yes, Colorado River Regional Water System has 52 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, MR, TT. 17 are health-based violations.
How many people does Colorado River Regional Water System serve?
Colorado River Regional Water System serves approximately 8,490 people, Arizona.
What type of water does Colorado River Regional Water System provide?
Colorado River Regional Water System sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is 090400051.
How does Colorado River Regional Water System compare to other utilities in Arizona?
Colorado River Regional Water 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.