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First Mesa, AZ Tap Water Quality 2026

Water quality report for First Mesa, AZ — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at First Mesa's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Polacca PWSID: 090400106 Updated: 2026 Q2
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2 violations currently open

Lead is 1.00 ppb, 7% of the action level. No PFAS was detected.

F

First Mesa earns an F for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 1.00 ppb — 7% of the federal action level
PFAS tested, none detected
76 violations since 2015, 38 health-based
2 violations currently open
First Mesa's lead level vs. all Arizona community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 1.00 ppb — 7% of the federal action level
✓ Lower lead than 78% of Arizona utilities
Population Served
676
~446 connections
Water Source
Groundwater
Purchased groundwater from another system — SDWIS source code GWP
Active Violations
2
2 open of 76 since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
7% of EPA action level
1.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 1.00 ppb, 7% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Unaddressed
E. COLI MONITORING AND REPORTING — 0 2023 Unaddressed
Revised Total Coliform Rule MONITORING FAILURE — — 2023 Resolved
Arsenic MCL EXCEEDANCE 0.018 MG/L 0.010 mg/L 2023 Resolved
Revised Total Coliform Rule TREATMENT TECHNIQUE — — 2023 Unaddressed
E. COLI MONITORING AND REPORTING — 0 2023 Unaddressed
Arsenic MCL EXCEEDANCE 0.0183 MG/L 0.010 mg/L 2023 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2023 Resolved
Arsenic MCL EXCEEDANCE 0.018 MG/L 0.010 mg/L 2023 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2023 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Unaddressed
Arsenic MCL EXCEEDANCE 0.0178 MG/L 0.010 mg/L 2022 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2022 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2022 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2022 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2022 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2022 Resolved
Public Notice OTHER — — 2022 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2022 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2022 Resolved
Arsenic MCL EXCEEDANCE 0.0608 MG/L 0.010 mg/L 2022 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2022 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2022 Resolved
Public Notice OTHER — — 2022 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2021 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2021 Resolved
Public Notice OTHER — — 2021 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2021 Resolved
Arsenic MCL EXCEEDANCE 0.0173 MG/L 0.010 mg/L 2021 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2020 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2020 Resolved
Arsenic MCL EXCEEDANCE 0.0173 MG/L 0.010 mg/L 2020 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2020 Resolved
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2020–2022 Resolved
Picloram MONITORING AND REPORTING — 0.5 mg/L 2020–2022 Resolved
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2020–2022 Resolved
Benzo(a)pyrene MONITORING AND REPORTING — 0.0002 mg/L 2020–2022 Resolved
Arsenic MCL EXCEEDANCE 0.0165 MG/L 0.010 mg/L 2019 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2019 Resolved
Arsenic MCL EXCEEDANCE 0.0168 MG/L 0.010 mg/L 2019 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2019 Resolved
Arsenic MCL EXCEEDANCE 0.0163 MG/L 0.010 mg/L 2018 Resolved
Arsenic MCL EXCEEDANCE 0.0153 MG/L 0.010 mg/L 2018 Resolved
Arsenic MCL EXCEEDANCE 0.0155 MG/L 0.010 mg/L 2018 Resolved
Arsenic MCL EXCEEDANCE 0.0155 MG/L 0.010 mg/L 2018 Resolved
Arsenic MCL EXCEEDANCE 0.0165 MG/L 0.010 mg/L 2017 Resolved
Arsenic MCL EXCEEDANCE 0.0168 MG/L 0.010 mg/L 2017 Resolved
Arsenic MCL EXCEEDANCE 0.0177 MG/L 0.010 mg/L 2017 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2017 Resolved
Arsenic MCL EXCEEDANCE 0.0163 MG/L 0.010 mg/L 2016 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2016 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2016 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2015 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2015 Resolved
Public Notice OTHER — — 2015 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2015 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2015 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2015 Resolved
Public Notice OTHER — — 2015 Resolved
Arsenic MCL EXCEEDANCE 0.017 MG/L 0.010 mg/L 2015 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2015 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2015 Resolved
Coliform (TCR) MONITORING AND REPORTING — 5% of samples 2015 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2015 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2015 Resolved
Public Notice OTHER — — 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

2 violations remain open, out of 76 recorded since 2015 (38 health-based).

About the Main Water System

Utility Polacca
PWSID 090400106
Water source Groundwater — Purchased groundwater from another system — SDWIS source code GWP
Population served 676
Service connections 446
Systems serving this area 1
Regulator US EPA (tribal primacy)
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is First Mesa tap water safe to drink? ▼
No federal limit is exceeded on record. 2 violation(s) remain open. Lead is 1.00 ppb, 7% of the action level.
Does First Mesa water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to First Mesa? ▼
Polacca (PWSID 090400106). Groundwater. Purchased groundwater from another system — SDWIS source code GWP
When was this system last inspected? ▼
It was last inspected on 2025-10-23. Inspectors recorded 3 significant deficiencies.

What Should First Mesa Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Follow the open violation
This system has an unresolved violation. Contact the supplier for its corrective-action schedule.

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