Water Quality in Yuma, AZ: 360 Violations — Grade C
Grade C · Score 60/100 · 5 water systems · Updated 2026-05-03
Yuma's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Yuma, AZ has 360 violations in the EPA compliance history — breakdown below.
Water Quality Map: Yuma, AZ
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Water Quality by ZIP Code in Yuma
Water quality varies across Yuma's 5 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 85364 | D | 54 | 72 | 19 | View report → |
| 85366 | C | 59 | 72 | 19 | View report → |
| 85369 | C | 59 | 72 | 19 | View report → |
| 85365 | C | 64 | 72 | 19 | View report → |
| 85367 | C | 64 | 72 | 19 | View report → |
Violation Trend
EPA violations recorded for water systems serving Yuma.
Water Quality Overview
Yuma, Arizona receives a water quality grade of C with an overall score of 60 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 5 water systems serving Yuma have accumulated 360 EPA violations, including 95 health-based violations. These violations are tracked across 5 ZIP codes serving approximately 152,412 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Yuma's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
The average 90th percentile lead level across Yuma water systems is 0.0011 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
Radon Risk
Yuma is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Yuma
Yuma is served by 5 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 152,412 people across 5 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 50 enforcement actions against water systems serving Yuma. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Yuma
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR — your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test — certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration — NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories — monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Yuma Water Systems
The following contaminants have been detected or caused violations across Yuma's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Lead and Copper Rule | Treatment Technique | N/A | 75 | 5 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 20 | 5 | No |
| Chlorite | Disinfection Byproducts | 1 mg/L | 10 | 5 | Yes |
| Atrazine | Organic | 0.003 mg/L | 10 | 5 | No |
| Revised Total Coliform Rule | Microbiological | N/A | 10 | 5 | No |
| Stage 1 DBP Rule | Treatment Technique | N/A | 10 | 5 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 10 | 5 | No |
| Surface Water Treatment Rule | Treatment Technique | N/A | 10 | 5 | No |
| Lead | Inorganic | 0.015 mg/L | 5 | 5 | No |
| Fecal Coliform | Microbiological | N/A | 5 | 5 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Yuma:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2021 | 50 | 5 |
| 2022 | 15 | 0 |
| 2024 | 10 | 10 |
Violations have decreased from 50 in 2021 to 10 in 2024, indicating improving compliance.
EPA Enforcement History
The EPA and state regulators have taken 8 enforcement actions against water systems serving Yuma. Recent actions:
| Date | Action Type |
|---|---|
| 2025-08-12 | State Informal Action |
| 2025-08-12 | State Order Extension |
| 2025-07-01 | State Informal Action |
| 2025-06-12 | State Informal Action |
| 2025-06-10 | State Informal Action |
| 2025-06-10 | State Informal Enforcement |
| 2025-06-05 | State Informal Action |
| 2025-05-30 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-08-12.
Yuma vs. Nearby Arizona Cities
How Yuma's water quality compares to similar cities in Arizona:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Yuma | C | 360 | 5 | 152,412 |
| Casa Grande | B | 72 | 5 | 140,682 |
| Tempe | B | 192 | 4 | 166,887 |
| Waddell | C | 0 | 1 | 127,718 |
Water Quality by ZIP Code in Yuma
Water quality varies across Yuma's ZIP codes. The table below shows the worst-scoring and best-scoring areas:
| ZIP Code | Score | Grade | Violations | Health-Based |
|---|---|---|---|---|
| 85364 | 54 | D | 72 | 19 |
| 85366 | 59 | C | 72 | 19 |
| 85369 | 59 | C | 72 | 19 |
| 85365 | 64 | C | 72 | 19 |
| 85367 | 64 | C | 72 | 19 |
Common Questions About Yuma Water
These are the most common questions residents search for about water quality in Yuma, Arizona:
Is Yuma water hard or soft? Water hardness varies by source. Yuma's 5 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Yuma tap water? Yuma's water receives a grade of C (60/100). There are 95 health-based violations — consider filtration.
What is the best water filter for Yuma? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Yuma vs. Arizona Average
Understanding how Yuma compares to the broader Arizona average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below — water quality can vary significantly even within Yuma.
ZIP Codes in Yuma
Yuma spans 5 ZIP codes. The ZIP with the lowest water quality score is 85364. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.