Big Run STP
Masontown, PA · Fayette County · Publicly Owned Treatment Works
- Average flow
- 0.35 MGD
- Design flow
- 0.4 MGD
- NPDES permit
- PA0023906
- Effective
- Permit expires
- June 2029
- Population served
- —
- CWNS 2022
Big Run STP is a publicly owned wastewater treatment works in Masontown, Fayette County, Pennsylvania treating an average of 0.35 million gallons per day against a permitted design capacity of 0.4 MGD. Treatment on site includes clarifiers, aerated lagoons. It discharges under NPDES permit PA0023906 (effective), which expires in June 2029, with 0 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
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Big Run STP.
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Nearby wastewater treatment plants in Pennsylvania
Masontown · 1 mi away
0.08 MGD
Greensboro · 4 mi away
0.04 MGD
Carmichaels · 4 mi away
0.17 MGD
New Salem · 7 mi away
0.01 MGD
New Salem · 7 mi away
0.05 MGD
Dilliner · 7 mi away
0.04 MGD
Jefferson · 7 mi away
0.03 MGD
Smithfield · 7 mi away
0.06 MGD
Big Run 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 July 2, 2025.