Johnstown Wastewater Treatment Plant
Johnstown, PA · Cambria County · Publicly Owned Treatment Works
- Average flow
- 2.3 MGD
- Design flow
- —
- NPDES permit
- PAL026034
- Effective
- Permit expires
- December 2030
- Population served
- 78,141
- CWNS 2022
Johnstown Wastewater Treatment Plant is a publicly owned wastewater treatment works in Johnstown, Cambria County, Pennsylvania treating an average of 2.3 million gallons per day, serving about 78,141 residents. Treatment on site includes clarifiers. It discharges under NPDES permit PAL026034 (effective), which expires in December 2030, with 10 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 10
- Effluent violations
- 10
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Johnstown Wastewater Treatment Plant.
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Nearby wastewater treatment plants in Pennsylvania
Seward · 5 mi away
0.07 MGD
Seward · 5 mi away
0.008 MGD
Johnstown · 7 mi away
0.13 MGD
Vintondale · 7 mi away
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South Fork · 8 mi away
0.46 MGD
Johnstown · 8 mi away
1.4 MGD
Armagh · 8 mi away
0.03 MGD
Nanty Glo · 10 mi away
0.29 MGD
Johnstown Wastewater Treatment Plant: 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 March 14, 2025.