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St. Marys, PA Tap Water Quality 2026

Water quality report for St. Marys, PA — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

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

Main Utility: St Marys Area Water Auth PWSID: PA6240016 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 3.31 ppb, 22% of the action level and no violations are open. No PFAS was detected.

B

St. Marys earns a B for water quality

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

Lead: 3.31 ppb — 22% of the federal action level
PFAS tested, none detected
24 violations since 2015, 1 health-based
No violations currently open
St. Marys's lead level vs. all Pennsylvania community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 3.31 ppb — 22% of the federal action level
✓ Lower lead than 48% of Pennsylvania utilities
Population Served
12608
~7412 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
24 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
22% of EPA action level
3.31 ppb
Action level: 15 ppb
The 90th-percentile lead result is 3.31 ppb, 22% 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
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Archived
Public Notice OTHER — — 2025 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Endothall MONITORING AND REPORTING — 0.1 mg/L 2023 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2022–2023 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2021 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2021 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2020 Resolved
Public Notice OTHER — — 2020 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2020 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2020 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2019 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2019 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2019 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2018 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2018 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2018 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE — 0.060 mg/L 2016 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2015 Resolved
TTHM MONITORING AND REPORTING — 0.080 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

24 violations are on record since 2015, of which 1 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility St Marys Area Water Auth
PWSID PA6240016
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 12,608
Service connections 7,412
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is St. Marys tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 3.31 ppb, 22% of the action level.
Does St. Marys water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to St. Marys? ▼
St Marys Area Water Auth (PWSID PA6240016). Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2025-06-11. Inspectors recorded 1 significant deficiency.

What Should St. Marys 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
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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