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Second Mesa, AZ Tap Water Quality 2026

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

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

Main Utility: Sipaulovi (lower Sipaulovi/lower Mishongnovi) PWSID: 090400107 Updated: 2026 Q2
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2 violations currently open

Lead is 5.00 ppb, 33% of the action level. PFAS has never been sampled at this system.

F

Second Mesa earns an F for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 5.00 ppb — 33% of the federal action level
PFAS never sampled at this system
50 violations since 2015, 34 health-based
2 violations currently open
Second Mesa's lead level vs. all Arizona community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 5.00 ppb — 33% of the federal action level
✓ Lower lead than 24% of Arizona utilities
Population Served
268
~134 connections
Water Source
Groundwater
Purchased groundwater from another system — SDWIS source code GWP
Active Violations
2
2 open of 50 since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
33% of EPA action level
5.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 5.00 ppb, 33% 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
Groundwater Rule TREATMENT TECHNIQUE — — 2026 Unaddressed
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2025 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Public Notice OTHER — — 2025 Resolved
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Unaddressed
Groundwater Rule TREATMENT TECHNIQUE — — 2023 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2023 Archived
Public Notice OTHER — — 2023 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2023 Resolved
Public Notice OTHER — — 2023 Resolved
Arsenic MCL EXCEEDANCE 0.016 MG/L 0.010 mg/L 2022 Resolved
Arsenic MCL EXCEEDANCE 0.012 MG/L 0.010 mg/L 2022 Resolved
Arsenic MCL EXCEEDANCE 0.0123 MG/L 0.010 mg/L 2022 Resolved
Arsenic MCL EXCEEDANCE 0.0127 MG/L 0.010 mg/L 2021 Resolved
Arsenic MCL EXCEEDANCE 0.0131 MG/L 0.010 mg/L 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2021 Resolved
Arsenic MCL EXCEEDANCE 0.0174 MG/L 0.010 mg/L 2021 Resolved
Arsenic MCL EXCEEDANCE 0.0166 MG/L 0.010 mg/L 2021 Resolved
Arsenic MCL EXCEEDANCE 0.0153 MG/L 0.010 mg/L 2020 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2020 Resolved
Arsenic MCL EXCEEDANCE 0.0173 MG/L 0.010 mg/L 2020 Resolved
Arsenic MCL EXCEEDANCE 0.018 MG/L 0.010 mg/L 2020 Resolved
Arsenic MCL EXCEEDANCE 0.018 MG/L 0.010 mg/L 2020 Resolved
Arsenic MCL EXCEEDANCE 0.0177 MG/L 0.010 mg/L 2019 Resolved
Arsenic MCL EXCEEDANCE 0.0174 MG/L 0.010 mg/L 2019 Resolved
Arsenic MCL EXCEEDANCE 0.0174 MG/L 0.010 mg/L 2019 Resolved
Arsenic MCL EXCEEDANCE 0.0171 MG/L 0.010 mg/L 2019 Resolved
Arsenic MCL EXCEEDANCE 0.0172 MG/L 0.010 mg/L 2018 Resolved
Arsenic MCL EXCEEDANCE 0.0167 MG/L 0.010 mg/L 2018 Resolved
Arsenic MCL EXCEEDANCE 0.0165 MG/L 0.010 mg/L 2018 Resolved
Arsenic MCL EXCEEDANCE 0.0163 MG/L 0.010 mg/L 2018 Resolved
Arsenic MCL EXCEEDANCE 0.0159 MG/L 0.010 mg/L 2017 Resolved
Arsenic MCL EXCEEDANCE 0.0165 MG/L 0.010 mg/L 2017 Resolved
Arsenic MCL EXCEEDANCE 0.0166 MG/L 0.010 mg/L 2017 Resolved
Arsenic MCL EXCEEDANCE 0.0171 MG/L 0.010 mg/L 2017 Resolved
Arsenic MCL EXCEEDANCE 0.0174 MG/L 0.010 mg/L 2016 Resolved
Arsenic MCL EXCEEDANCE 0.0172 MG/L 0.010 mg/L 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Arsenic MCL EXCEEDANCE 0.0178 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 0.0178 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 0.0178 MG/L 0.010 mg/L 2015 Resolved
Public Notice OTHER — — 2015 Resolved
Arsenic MCL EXCEEDANCE 0.0178 MG/L 0.010 mg/L 2015 Resolved
Public Notice OTHER — — 2015 Resolved
Arsenic MCL EXCEEDANCE 0.0178 MG/L 0.010 mg/L 2015 Resolved
Arsenic MCL EXCEEDANCE 0.0174 MG/L 0.010 mg/L 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 50 recorded since 2015 (34 health-based).

About the Main Water System

Utility Sipaulovi (Lower Sipaulovi/Lower Mishongnovi)
PWSID 090400107
Water source Groundwater — Purchased groundwater from another system — SDWIS source code GWP
Population served 268
Service connections 134
Systems serving this area 4
Regulator US EPA (tribal primacy)
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Second Mesa tap water safe to drink? ▼
No federal limit is exceeded on record. 2 violation(s) remain open. Lead is 5.00 ppb, 33% of the action level.
Does Second Mesa water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Second Mesa? ▼
Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) (PWSID 090400107), one of 4 systems serving this area. Groundwater. Purchased groundwater from another system — SDWIS source code GWP
When was this system last inspected? ▼
It was last inspected on 2025-04-08. Inspectors recorded 1 significant deficiency.

What Should Second Mesa Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
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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