Peters Twp Junction STP
Mercersburg, PA · Franklin County · Publicly Owned Treatment Works
- Average flow
- 0.05 MGD
- Design flow
- 0.25 MGD
- NPDES permit
- PA0084191
- Effective
- Permit expires
- January 2029
- Population served
- —
- CWNS 2022
Peters Twp Junction STP is a publicly owned wastewater treatment works in Mercersburg, Franklin County, Pennsylvania treating an average of 0.05 million gallons per day against a permitted design capacity of 0.25 MGD. Treatment on site includes uncovered lagoons. It discharges under NPDES permit PA0084191 (effective), which expires in January 2029, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Peters Twp Junction STP.
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Nearby wastewater treatment plants in Pennsylvania
Mercersburg · 2 mi away
0.11 MGD
Mercersburg · 3 mi away
0.04 MGD
Greencastle · 5 mi away
0.02 MGD
Chambersburg · 8 mi away
0.16 MGD
Mcconnellsburg · 8 mi away
0.23 MGD
Greencastle · 9 mi away
0.27 MGD
Chambersburg · 9 mi away
0.01 MGD
Greencastle · 9 mi away
0.61 MGD
Peters Twp Junction STP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated November 19, 2025.