Upper Allen Twp STP
Mechanicsburg, PA · Cumberland County · Publicly Owned Treatment Works
- Average flow
- 0.67 MGD
- Design flow
- 1.1 MGD
- NPDES permit
- PA0024902
- Effective
- Permit expires
- February 2029
- Population served
- 3,809
- CWNS 2022
Upper Allen Twp STP is a publicly owned wastewater treatment works in Mechanicsburg, Cumberland County, Pennsylvania treating an average of 0.67 million gallons per day against a permitted design capacity of 1.1 MGD, serving about 3,809 residents. It discharges under NPDES permit PA0024902 (effective), which expires in February 2029, with 3 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 3
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Upper Allen Twp STP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Pennsylvania
Dillsburg · 4 mi away
0.54 MGD
Boiling Springs · 6 mi away
0.76 MGD
Lewisberry · 7 mi away
0.03 MGD
Mechanicsburg · 7 mi away
0.75 MGD
New Cumberland · 7 mi away
4.33 MGD
Lemoyne · 8 mi away
0.22 MGD
Mechanicsburg · 8 mi away
2.79 MGD
Camp Hill · 9 mi away
1.35 MGD
Upper Allen Twp 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 September 4, 2025.