Monongahela STP
Monongahela, PA · Washington County · Publicly Owned Treatment Works
- Average flow
- 0.85 MGD
- Design flow
- —
- NPDES permit
- PAL025950
- Effective
- Permit expires
- December 2030
- Population served
- —
- CWNS 2022
Monongahela STP is a publicly owned wastewater treatment works in Monongahela, Washington County, Pennsylvania treating an average of 0.85 million gallons per day. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit PAL025950 (effective), which expires in December 2030, with 13 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
- 13
- Effluent violations
- 13
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Monongahela STP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Monongahela STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Pennsylvania
New Eagle · 1 mi away
0.14 MGD
West Elizabeth · 5 mi away
0.35 MGD
Charleroi · 5 mi away
0.54 MGD
Elizabeth · 6 mi away
0.57 MGD
Pittsburgh · 6 mi away
3.22 MGD
Belle Vernon · 6 mi away
0.33 MGD
Clairton · 7 mi away
1.83 MGD
Clairton · 7 mi away
3.42 MGD
Monongahela 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 May 25, 2025.