Mt Holly Springs STP
Mt Holly Springs, PA · Cumberland County · Publicly Owned Treatment Works
- Average flow
- 0.25 MGD
- Design flow
- 0.7 MGD
- NPDES permit
- PA0023183
- Effective
- Permit expires
- May 2027
- Population served
- —
- CWNS 2022
Mt Holly Springs STP is a publicly owned wastewater treatment works in Mt Holly Springs, Cumberland County, Pennsylvania treating an average of 0.25 million gallons per day against a permitted design capacity of 0.7 MGD. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit PA0023183 (effective), which expires in May 2027, with 19 recorded violations 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
- 19
- Effluent violations
- 19
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mt Holly Springs STP.
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Nearby wastewater treatment plants in Pennsylvania
Boiling Springs · 5 mi away
0.76 MGD
Dillsburg · 8 mi away
0.54 MGD
Carlisle · 8 mi away
0.5 MGD
Carlisle · 8 mi away
0.05 MGD
Carlisle · 8 mi away
2.28 MGD
York Springs · 9 mi away
0.06 MGD
Aspers · 10 mi away
0.06 MGD
Mechanicsburg · 11 mi away
0.67 MGD
Mt Holly Springs 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 27, 2025.