Marietta Donegal STP
Marietta, PA · Lancaster County · Publicly Owned Treatment Works
- Average flow
- 0.58 MGD
- Design flow
- 0.75 MGD
- NPDES permit
- PA0021717
- Effective
- Permit expires
- December 2026
- Population served
- —
- CWNS 2022
Marietta Donegal STP is a publicly owned wastewater treatment works in Marietta, Lancaster County, Pennsylvania treating an average of 0.58 million gallons per day against a permitted design capacity of 0.75 MGD. It discharges under NPDES permit PA0021717 (effective), which expires in December 2026, with 1 recorded violation 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
- 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 Marietta Donegal STP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Pennsylvania
Wrightsville · 3 mi away
0.37 MGD
Mount Joy · 4 mi away
0.76 MGD
Columbia · 4 mi away
1.58 MGD
Elizabethtown · 7 mi away
1.7 MGD
Bainbridge · 7 mi away
0.05 MGD
York · 9 mi away
7.61 MGD
Mount Wolf · 9 mi away
0.07 MGD
Mount Wolf · 9 mi away
0.54 MGD
Marietta Donegal 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 August 3, 2026.