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San Luis, AZ Tap Water Quality 2026

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

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

Main Utility: San Luis City Of PWSID: AZ0414005 Updated: 2026 Q2
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1 violation currently open

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

D

San Luis earns a D 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
15 violations since 2015, 3 health-based
1 violation currently open
San Luis'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
23556
~6100 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
1
1 open of 15 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 MONITORING AND REPORTING — TT 2024 Resolved
Groundwater Rule TREATMENT TECHNIQUE — — 2024 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2024 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2021 Resolved
Revised Total Coliform Rule TREATMENT TECHNIQUE — — 2021 Unaddressed
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021 Resolved
E. COLI MONITORING AND REPORTING — 0 2021 Resolved
Groundwater Rule TREATMENT TECHNIQUE — — 2021 Resolved
Revised Total Coliform Rule OTHER — — 2021 Resolved
Consumer Confidence Rule OTHER — — 2019 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2019 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2017 Resolved
E. COLI MONITORING AND REPORTING — 0 2015 Resolved
E. COLI MONITORING AND REPORTING — 0 2015 Resolved
Coliform (TCR) MONITORING AND REPORTING — 5% of samples 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

1 violation remains open, out of 15 recorded since 2015 (3 health-based).

About the Main Water System

Utility San Luis City Of
PWSID AZ0414005
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 23,556
Service connections 6,100
Systems serving this area 3
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is San Luis tap water safe to drink? ▼
No federal limit is exceeded on record. 1 violation(s) remain open. Lead is 1.00 ppb, 7% of the action level.
Does San Luis water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to San Luis? ▼
San Luis City Of (PWSID AZ0414005), one of 3 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-01-30. Inspectors recorded 1 significant deficiency.

What Should San Luis 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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