Mt Gretna Auth STP
Mount Gretna, PA · Lebanon County · Publicly Owned Treatment Works
- Average flow
- 0.08 MGD
- Design flow
- 0.2 MGD
- NPDES permit
- PA0020591
- Expired
- Permit expires
- May 2026
- Population served
- —
- CWNS 2022
Mt Gretna Auth STP is a publicly owned wastewater treatment works in Mount Gretna, Lebanon County, Pennsylvania treating an average of 0.08 million gallons per day against a permitted design capacity of 0.2 MGD. It discharges under NPDES permit PA0020591 (expired), which expires in May 2026, with 28 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
- 28
- Effluent violations
- 28
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mt Gretna Auth STP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Pennsylvania
Colebrook · 1 mi away
0.02 MGD
Lawn · 3 mi away
0.008 MGD
Campbelltown · 6 mi away
0.12 MGD
Annville · 7 mi away
0.56 MGD
Lebanon · 7 mi away
5.22 MGD
Manheim · 7 mi away
0.48 MGD
Manheim · 7 mi away
0.32 MGD
Campbelltown · 8 mi away
0.14 MGD
Mt Gretna 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 November 18, 2025.