Is Mesa Tap Water Safe? What Mesa City of’s EPA Records Show
Mesa City of, which serves about 466,000 people in Arizona, reported PFAS detections in the EPA’s UCMR5 monitoring (2023-2025), all below the current EPA limits. Occurrence data, not a compliance finding. Its most recent EPA-record lead 90th-percentile was 5.01 ppb — under the current 15 ppb action level. The system has 3 health-based violations on its federal SDWA record.
See the full interactive report for this system — every PFAS analyte, lead and copper rounds, violations, and the filter that handles what was found: open the Mesa report → Or check YOUR exact ZIP: check your water by ZIP →
Beyond PFAS: state-record results over an EPA limit
- arsenic: 13 ug/L (highest sample 2012-08-06; 2012-2019 records, not current)
- tthm: 104 ug/L (highest sample 2016-05-10; 2012-2019 records, not current)
These are the highest samples in the state/EPA record for this system — a snapshot, not a current reading; the utility’s Consumer Confidence Report is the official current record.
Common questions about Mesa water
Is Mesa's tap water safe to drink?
The records show arsenic, tthm above a current EPA limit or action level — the details, with dates, are in the sections above. That is a system-level occurrence record, not a verdict on any individual tap. These are system-level records for public water systems, not a reading of any individual home’s tap, and they do not cover private wells. Confirm your own utility’s current Consumer Confidence Report, and test your tap if you’re unsure.
Does Mesa have PFAS in its drinking water?
Mesa City of reported PFAS detections below current EPA limits in UCMR5 monitoring.
Who supplies Mesa's drinking water?
Mesa City of (PWSID AZ0407095) serves about 466,000 people, per EPA SDWIS records. A metro area is usually served by more than one water system — this page covers the area’s largest. Suburbs and neighboring towns often have their own systems with their own results; check your exact ZIP for yours.
How do I check my exact address?
Water systems report by system, not by address. Enter your ZIP on the water checker to see the system(s) serving it and what each reported.
Statewide, 15.8% of Arizona’s UCMR5-tested systems reported PFOA or PFOS over the EPA limit — see the Arizona water page.
Other large systems in Arizona
See the 100 largest US water systems, water quality by state, and the national PFAS data study.
Sources: EPA UCMR5 occurrence data, Feb 2026 release (~95% complete; final reporting 2026) (2026-06); lead/copper + violations: EPA SDWIS via ECHO; population served: EPA SDWIS via ECHO (system-reported population served). PWSID AZ0407095. Public-domain federal/state records; assembly by WaterByTheBook. Built 2026-07-25. Plain-markdown mirror: https://waterbythebook.com/md/mesa.md