Mesa, AZ: 133 Violations — 71/100 (2026)
19 ZIP codes · 6 water systems · Updated 2026-06-03
Mesa's tap water quality puts it in AZ's upper tier — health-based violations are rare and the compliance record is consistently above average.
How Mesa Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Mesa, AZ
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Distribution of water safety grades across Mesa.
Mesa Water: The Quick Version
- Your city's water systems recorded 133 violations in the past 5 years.
- Average lead level: 0.005 mg/L.
- Homes built before 1986: 46% — older plumbing may contain lead solder.
- Estimated remediation: $1,695 per household.
- CDC health risk index: 11.3.
Water Systems Serving Mesa
Mesa, AZ is covered by 3 major water utilities out of 6 federally tracked systems, each managing its own pipes, treatment processes, and EPA filings. What a household gets from the tap depends on which provider's system serves that address.
Overview
We track water quality and home safety data for 19 ZIP codes in Mesa, Arizona (population ~550,266), covering 6 community water systems serving approximately 1,036,257 people region-wide.
19 of 19 ZIP codes (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Mesa: B (71/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Mesa water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0050 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 19 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Contaminant 1011 | Other | 40 | 19 |
| Contaminant 1009 | Other | 20 | 19 |
| Contaminant 1052 | Other | 20 | 19 |
| Chlorite | Disinfection Byproducts | 20 | 19 |
| Consumer Confidence Report Rule | Reporting | 20 | 19 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 85201 | C | 7 | 0 | City of Mesa |
| 85202 | B | 7 | 0 | City of Mesa |
| 85203 | C | 7 | 0 | City of Mesa |
| 85204 | B | 7 | 0 | City of Mesa |
| 85205 | B | 7 | 0 | City of Mesa |
| 85206 | C | 7 | 0 | City of Mesa |
| 85207 | B | 7 | 0 | City of Mesa |
| 85208 | B | 7 | 0 | City of Mesa |
| 85209 | B | 7 | 0 | City of Mesa |
| 85210 | B | 7 | 0 | City of Mesa |
All ZIP Codes in Mesa
- 85201 [C] — 7 violations
- 85202 [B] — 7 violations
- 85203 [C] — 7 violations
- 85204 [B] — 7 violations
- 85205 [B] — 7 violations
- 85206 [C] — 7 violations
- 85207 [B] — 7 violations
- 85208 [B] — 7 violations
- 85209 [B] — 7 violations
- 85210 [B] — 7 violations
- 85211 [B] — 7 violations
- 85212 [B] — 7 violations
- 85213 [B] — 7 violations
- 85214 [B] — 7 violations
- 85215 [B] — 7 violations
- 85216 [B] — 7 violations
- 85274 [B] — 7 violations
- 85275 [B] — 7 violations
- 85277 [B] — 7 violations
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
Updated daily.
CDC Health Data for Mesa
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Mesa
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Mesa's Housing Stock?
With 46% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
With a median build year of 1986, Mesa's housing stock reflects a city built across multiple eras. A substantial share of homes predate 1986 — the year lead solder in plumbing was federally banned — meaning the risk from plumbing materials is unevenly distributed across the city's neighborhoods and property types.
Most homes in Mesa were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Mesa: Remediation Cost in Perspective
Given current Mesa valuations, the remediation-to-property-value ratio is low — most homeowners are looking at a proportionally modest share that fits within routine financial planning.
Remediation costs in Mesa are relatively low compared to home values. The $847–$2,758 estimated range is a small fraction of median property value. Home values are 9% above the Arizona average.
Protecting Children from Lead in Mesa
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Even where utility-side monitoring meets Lead and Copper Rule requirements, the 46% pre-rule share in Mesa keeps interior-plumbing variation as a household-level question that aggregate data cannot resolve.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Mesa
Measured across the NFIP's multi-decade tracking period, Mesa shows a moderate flood record — 77 claims and 63% of ZIP codes carrying FEMA flood zone status. For water quality, that combination matters because flood events at this frequency can periodically stress infrastructure: treatment plants, private wells, and distribution systems all face elevated risk during significant flooding.
Mesa has a moderate flood history with 77 FEMA claims averaging $14,861 per payout. 63% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,695</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Mesa, AZ