Whitemarsh STP
Lafayette Hill, PA · Montgomery County · Publicly Owned Treatment Works
- Average flow
- 0.73 MGD
- Design flow
- 2 MGD
- NPDES permit
- PA0026298
- Effective
- Permit expires
- January 2029
- Population served
- 15,329
- CWNS 2022
Whitemarsh STP is a publicly owned wastewater treatment works in Lafayette Hill, Montgomery County, Pennsylvania treating an average of 0.73 million gallons per day against a permitted design capacity of 2 MGD, serving about 15,329 residents. Treatment on site includes clarifiers. It discharges under NPDES permit PA0026298 (effective), which expires in January 2029, with 18 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
- 18
- Effluent violations
- 15
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Whitemarsh STP.
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Nearby wastewater treatment plants in Pennsylvania
Conshohocken · 1 mi away
1.18 MGD
King Of Prussia · 3 mi away
2.57 MGD
Bridgeport · 3 mi away
0.41 MGD
Plymouth Meeting · 3 mi away
3.6 MGD
Norristown · 3 mi away
3.96 MGD
Fort Washington · 6 mi away
0.67 MGD
King Of Prussia · 7 mi away
2.27 MGD
Abington · 7 mi away
2.23 MGD
Whitemarsh 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 24, 2025.