US Water Score: D
| Contaminant | Detected Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| Lead |
5.01
|
15 ppb | 1 ppb | Warning |
UCMR5 occurrence results are screening information, not a finding of regulatory compliance or noncompliance. PFAS rules and compliance dates are evolving.
| Compound | Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| PFBS | 15.2 ppt | 2000 ppt | 100 ppt | Below comparison value |
| PFHxS | 9.3 ppt | 10 ppt | 10 ppt | Below comparison value |
| PFHxA | 3.2 ppt | No standard | 400 ppt | No federal MCL shown |
Water Quality Summary
Tap water quality in Mesa, Arizona (85204) receives an overall grade of D (Elevated record-based concern) with a score of 52 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 20 points below the Arizona state average of 72. Compared to the national average (75), this area scores significantly lower. The area is served by Mesa City Of, a surface water system providing water to approximately 466,000 people. Testing has found elevated levels of Lead that warrant attention. PFAS testing detected 3 compounds, all below the EPA final MCL values used for comparison. The area has 29 violations over the past 5 years, though none were classified as health-based.
A score of 52/100 flags significant system-level concerns in the US Water Score model for Mesa, AZ. These may include violations, contaminant levels near or above regulatory limits, or PFAS detections. Review the detailed records, your utility's Consumer Confidence Report, and qualified local guidance.
Health Information
Lead is a toxic metal that can leach from aging pipes and plumbing fixtures.
Even low levels of lead exposure can cause developmental delays in children, kidney damage, and cardiovascular effects in adults. The EPA action level is 15 ppb, but health experts recommend no safe level of lead in drinking water.
Lead enters water primarily through corrosion of lead service lines, lead solder, and brass fixtures — especially in homes built before 1986.
If lead is detected above 1 ppb, consider using a certified lead-removal filter (NSF/ANSI 53) for drinking and cooking water. Run cold water for 30 seconds before use if water has been sitting in pipes.
Common Questions
Tap water in Mesa, Arizona receives a grade of D (Elevated record-based concern) with a score of 52/100. This indicates significant water quality concerns based on violation history, contaminant levels, or enforcement actions. We recommend reviewing the specific contaminants detected below and considering a certified water filter.
ZIP code 85204 is served by 1 water system using surface water sources, providing water to approximately 466,000 people. Surface water systems are more susceptible to contamination from agricultural runoff, industrial discharge, and weather events, but typically undergo more extensive treatment including filtration and disinfection.
Lead was reported at 5.01 ppb in public-system records for Mesa, Arizona. This is below the currently applicable EPA action level of 15 ppb, but may be above more protective health guidance; EPA's future LCRI action level is 10 ppb. Household plumbing can materially change tap-level exposure, so consider certified filtration and individual tap testing, especially where children are present.
3 PFAS compounds were detected in water serving Mesa, Arizona, with reported values below the EPA final MCL values used by this site. This comparison is informational: federal compliance timelines and the status of some PFAS standards are still evolving. Activated carbon or reverse osmosis filters can reduce some PFAS when appropriately certified and maintained.
Water systems serving Mesa, Arizona have received 29 violations in the last 5 years. Violations can range from paperwork issues (monitoring & reporting) to serious health-based violations where contaminant levels exceeded safe limits. Review the violation details above for specifics.
Based on detected contaminants (lead, PFAS), residents in Mesa, Arizona should consider: Reverse osmosis (RO) system — most effective for PFAS, lead, and other contaminants. Always look for filters with NSF/ANSI certification for the specific contaminants you want to remove.
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