City of Mesa
EPA ID: AZ0407095 · 466,000 people served · 22 ZIP codes
5 open EPA findings remain on record at City of Mesa — the utility supplies approximately 466,000 people.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 2 (2022) to 6 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for City of Mesa Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The City of Mesa serves a community with a median household income of $70,640 and an estimated 699,340 residents across its service area. Approximately 44% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
City of Mesa's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 1% of homes in Pinal County, Arizona rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How City of Mesa compares to EPA limits
What This Means For You
Contaminant 1009 at 1 mg/L exceeds the EPA maximum of 0.004 mg/L. Intestinal damage, bone damage. Consider reverse osmosis filtration.
Contaminant 1011 at 2 mg/L exceeds the EPA maximum of mg/L.
Contaminant 1052 at 1 mg/L exceeds the EPA maximum of mg/L.
Consumer Confidence Report Rule at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 69 detections recorded. 9 exceed federal EPA limits (4 ppt for PFOA/PFOS). 2 exceed state limits.
Contaminant 1009 was detected in this water system. reverse osmosis filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Arizona
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
City of Mesa (EPA ID: AZ0407095) is a community water system in Arizona that serves approximately 466,000 people from surface water sources.
This system provides water to 22 ZIP codes across 4 communities.
Average Home Safety Score: B (71/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| August 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| March 1, 2025 | Contaminant 1011 | Monitoring | Resolved |
| February 1, 2025 | Contaminant 1011 | Monitoring | Resolved |
| January 1, 2023 | Contaminant 1052 | Monitoring | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Contaminant 1011 | Other Violation | 2 | No |
| Contaminant 1009 | Other Violation | 1 | No |
| Contaminant 1052 | Other Violation | 1 | No |
| Chlorite | Disinfection Byproducts | 1 | No |
| Consumer Confidence Report Rule | Reporting Failure | 1 | No |
| E. coli | Microbiological | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 85201 | 0.00501 mg/L | No | N/A |
| 85202 | 0.00501 mg/L | No | N/A |
| 85203 | 0.00501 mg/L | No | N/A |
| 85204 | 0.00501 mg/L | No | N/A |
| 85205 | 0.00501 mg/L | No | N/A |
| 85206 | 0.00501 mg/L | No | N/A |
| 85207 | 0.00501 mg/L | No | N/A |
| 85208 | 0.00501 mg/L | No | N/A |
| 85209 | 0.00501 mg/L | No | N/A |
| 85210 | 0.00501 mg/L | No | N/A |
| 85211 | 0.00501 mg/L | No | N/A |
| 85212 | 0.00501 mg/L | No | N/A |
| 85213 | 0.00501 mg/L | No | N/A |
| 85214 | 0.00501 mg/L | No | N/A |
| 85215 | 0.00501 mg/L | No | N/A |
| 85216 | 0.00501 mg/L | No | N/A |
| 85274 | 0.00501 mg/L | No | N/A |
| 85275 | 0.00501 mg/L | No | N/A |
| 85277 | 0.00501 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 16 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 6 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 85120 — Apache Junction
- 85201 — Mesa
- 85202 — Mesa
- 85203 — Mesa
- 85204 — Mesa
- 85205 — Mesa
- 85206 — Mesa
- 85207 — Mesa
- 85208 — Mesa
- 85209 — Mesa
- 85210 — Mesa
- 85211 — Mesa
- 85212 — Mesa
- 85213 — Mesa
- 85214 — Mesa
- 85215 — Mesa
- 85216 — Mesa
- 85234 — Gilbert
- 85274 — Mesa
- 85275 — Mesa
- 85277 — Mesa
- 85281 — Tempe
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for City of Mesa (AZ0407095) on EPA.gov.
Frequently Asked Questions
Is City of Mesa water safe to drink?
City of Mesa has only monitoring/reporting violations, which are procedural in nature. The system meets federal health-based standards.
How many people does City of Mesa serve?
City of Mesa serves approximately 466,000 people across 22 ZIP codes in Arizona.
Where does City of Mesa get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
City of Mesa (EPA ID: AZ0407095) — request the latest Consumer Confidence Report or ask about specific contaminants.