Greencastle STP
Greencastle, PA · Franklin County · Publicly Owned Treatment Works
- Average flow
- 0.27 MGD
- Design flow
- 0.95 MGD
- NPDES permit
- PA0020834
- Effective
- Permit expires
- July 2031
- Population served
- —
- CWNS 2022
Greencastle STP is a publicly owned wastewater treatment works in Greencastle, Franklin County, Pennsylvania treating an average of 0.27 million gallons per day against a permitted design capacity of 0.95 MGD. Treatment on site includes clarifiers, uncovered lagoons. It discharges under NPDES permit PA0020834 (effective), which expires in July 2031, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
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 Greencastle STP.
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Nearby wastewater treatment plants in Pennsylvania
Greencastle · 4 mi away
0.02 MGD
Greencastle · 4 mi away
0.61 MGD
Chambersburg · 8 mi away
0.16 MGD
Mercersburg · 9 mi away
0.05 MGD
Waynesboro · 9 mi away
0.16 MGD
Mercersburg · 9 mi away
0.11 MGD
Mont Alto · 10 mi away
0.07 MGD
Chambersburg · 10 mi away
5.16 MGD
Greencastle 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 May 25, 2025.