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Union, PA Tap Water Quality 2026

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

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

Main Utility: Mapleton Muni Water Auth PWSID: PA4310015 Updated: 2026 Q2
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Lead above the federal action level

Lead is 19.00 ppb, 127% of the action level and no violations are open. PFAS has never been sampled at this system.

F

Union earns an F for water quality

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

Lead: 19.00 ppb — 127% of the federal action level
PFAS never sampled at this system
120 violations since 2015, 3 health-based
No violations currently open
Union's lead level vs. all Pennsylvania community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 19.00 ppb — 100% of the federal action level
✓ Lower lead than 10% of Pennsylvania utilities
Population Served
164
~244 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
120 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
100% of EPA action level
19.00 ppb
Action level: 15 ppb
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
149.2% of EPA action level
1,940 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 19.00 ppb, 127% 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. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Lead and Copper Rule MONITORING AND REPORTING — TT 2025 Resolved
Groundwater Rule MONITORING AND REPORTING — — 2025 Archived
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Archived
Public Notice OTHER — — 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
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 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Public Notice OTHER — — 2024 Resolved
Public Notice OTHER — — 2024 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2024 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2023 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2023 Resolved
Public Notice OTHER — — 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2022 Resolved
Groundwater Rule MONITORING AND REPORTING — — 2021 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2021 Resolved
Consumer Confidence Rule OTHER — — 2021 Resolved
Groundwater Rule MONITORING AND REPORTING — — 2020 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2020 Resolved
Endrin MONITORING AND REPORTING — 0.002 mg/L 2020 Resolved
BHC-GAMMA MONITORING AND REPORTING — 0.0002 mg/L 2020 Resolved
Methoxychlor MONITORING AND REPORTING — 0.04 mg/L 2020 Resolved
Toxaphene MONITORING AND REPORTING — 0.003 mg/L 2020 Resolved
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2020 Resolved
Diquat MONITORING AND REPORTING — 0.02 mg/L 2020 Resolved
Endothall MONITORING AND REPORTING — 0.1 mg/L 2020 Resolved
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2020 Resolved
Di(2-ethylhexyl) adipate MONITORING AND REPORTING — 0.4 mg/L 2020 Resolved
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2020 Resolved
Simazine MONITORING AND REPORTING — 0.004 mg/L 2020 Resolved
Di(2-ethylhexyl) phthalate MONITORING AND REPORTING — 0.006 mg/L 2020 Resolved
Picloram MONITORING AND REPORTING — 0.5 mg/L 2020 Resolved
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2020 Resolved
Hexachlorocyclopentadiene MONITORING AND REPORTING — 0.05 mg/L 2020 Resolved
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2020 Resolved
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2020 Resolved
LASSO MONITORING AND REPORTING — — 2020 Resolved
2,3,7,8-TCDD MONITORING AND REPORTING — 0.00000003 mg/L 2020 Resolved
Heptachlor MONITORING AND REPORTING — 0.0004 mg/L 2020 Resolved
Heptachlor epoxide MONITORING AND REPORTING — 0.0002 mg/L 2020 Resolved
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2020 Resolved
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2020 Resolved
HEXACHLOROBENZENE MONITORING AND REPORTING — 0.001 mg/L 2020 Resolved
Benzo(a)pyrene MONITORING AND REPORTING — 0.0002 mg/L 2020 Resolved
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2020 Resolved
Total Polychlorinated Biphenyls (PCB) MONITORING AND REPORTING — 0.0005 mg/L 2020 Resolved
1,2-DIBROMO-3-CHLOROPROPANE MONITORING AND REPORTING — 0.0002 mg/L 2020 Resolved
ETHYLENE DIBROMIDE MONITORING AND REPORTING — 0.00005 mg/L 2020 Resolved
Chlordane MONITORING AND REPORTING — 0.002 mg/L 2020 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2019 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2019 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2017 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2017 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2017 Resolved
1,2-DIBROMO-3-CHLOROPROPANE MONITORING AND REPORTING — 0.0002 mg/L 2017 Resolved
ETHYLENE DIBROMIDE MONITORING AND REPORTING — 0.00005 mg/L 2017 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2017 Resolved
Mercury MONITORING AND REPORTING — 0.002 mg/L 2017 Resolved
Selenium MONITORING AND REPORTING — 0.05 mg/L 2017 Resolved
Antimony, Total MONITORING AND REPORTING — 0.006 mg/L 2017 Resolved
Thallium, Total MONITORING AND REPORTING — 0.002 mg/L 2017 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2016 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Groundwater Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2016 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2016 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2016 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2016 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2016 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2016 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2016 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2016 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2016 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2016 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2016 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2016 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2016 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2016 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2016 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2016 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2016 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2016 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2016 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2016 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

120 violations are on record since 2015, of which 3 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Mapleton Muni Water Auth
PWSID PA4310015
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 164
Service connections 244
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Union tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 19.00 ppb, 127% of the action level.
Does Union 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 Union? ▼
Mapleton Muni Water Auth (PWSID PA4310015). Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2026-04-02. Inspectors recorded 2 significant deficiencies.

What Should Union 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
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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