North Middleton Auth STP
Carlisle, PA · Cumberland County · Publicly Owned Treatment Works
- Average flow
- 0.5 MGD
- Design flow
- 1.3 MGD
- NPDES permit
- PA0024384
- Effective
- Permit expires
- May 2027
- Population served
- —
- CWNS 2022
North Middleton Auth STP is a publicly owned wastewater treatment works in Carlisle, Cumberland County, Pennsylvania treating an average of 0.5 million gallons per day against a permitted design capacity of 1.3 MGD. Treatment on site includes aerated lagoons. It discharges under NPDES permit PA0024384 (effective), which expires in May 2027, with 2 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at North Middleton Auth STP.
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Nearby wastewater treatment plants in Pennsylvania
Carlisle · 2 mi away
2.28 MGD
Carlisle · 7 mi away
0.05 MGD
Boiling Springs · 7 mi away
0.76 MGD
Mt Holly Springs · 8 mi away
0.25 MGD
Mechanicsburg · 9 mi away
0.75 MGD
Landisburg · 10 mi away
0.01 MGD
Mechanicsburg · 11 mi away
2.79 MGD
Dillsburg · 11 mi away
0.54 MGD
North Middleton Auth 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 April 6, 2025.