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Violation History
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About this data: ClearWater uses the EPA's Safe Drinking Water Information System (SDWIS). Data is for public water systems only; private wells are not included. Legal limits (MCLs) are minimum standards; some contaminants may still pose health risks below legal thresholds.
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CITY OF YUMA
YUMA, AZ · 103,264 people served · Surface Water
Data last updated: 2026-07-11
87 total violations on record. No currently active health-based violations.
Health-Based Violations
- CARBON, TOTAL: Treatment Technique Violation (Resolved)
- Chlorine dioxide: Maximum Residual Disinfectant Level (Resolved)
- Chlorine dioxide: Maximum Residual Disinfectant Level (Resolved)
- Chlorine dioxide: Maximum Residual Disinfectant Level (Resolved)
- Chlorine dioxide: Maximum Residual Disinfectant Level (Resolved)
- Chlorine dioxide: Maximum Residual Disinfectant Level (Resolved)
Lead & Copper
| Measure | Result | EPA action level | Status | Monitoring period |
|---|---|---|---|---|
| Lead (90th percentile) | 0.0011 mg/L | 0.015 mg/L | Below action level | 2024-12-31 |
These are 90th-percentile results across sampled household taps, not a single measurement, and neither lead nor copper has a Maximum Contaminant Level. Lead reaches tap water from household plumbing rather than from the treatment plant, so a result below the action level does not guarantee your own tap is below it. Source: EPA SDWIS, Lead and Copper Rule sampling.
Lithium
Highest reported detection: 150 µg/L. EPA's non-regulatory Health Reference Level is 10 µg/L. This system's highest detection is above that reference level.
Lithium has no federal drinking water limit. The Health Reference Level is a non-regulatory screening value from EPA's CCL 5 process, not an enforceable standard, and a result above it is not a violation. The figure shown is the highest single detection reported for this system; EPA compares averages, not maxima, when it reports national statistics. Source: EPA UCMR 5 occurrence data, reference values from EPA's UCMR 5 Data Summary (January 2026), Table 2.
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CITY OF YUMA: Frequently Asked Questions
Is CITY OF YUMA water safe to drink?
CITY OF YUMA currently has no active health-based violations and has met all EPA standards in recent years. While this indicates good water quality compliance, you may still want to consider filtering your water, especially if your home has older plumbing that may contain lead.
What violations has CITY OF YUMA had?
Recent health-based violations at CITY OF YUMA include: CARBON, TOTAL, Chlorine dioxide, Chlorine dioxide. See the full violation history on this page for dates, status, and details.
Does CITY OF YUMA water have lead?
Lead in drinking water typically comes from household plumbing, not from CITY OF YUMA's treatment plant. See the Lead & Copper section on this page for the most recent 90th-percentile lead test results. If your home was built before 1986, consider running cold water for 30 seconds before drinking and using an NSF/ANSI 53-certified filter.
Related water quality pages
Lead & Copper
What To Do
Violations
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