Ridley Creek STP
West Chester, PA · Chester County · Publicly Owned Treatment Works
- Average flow
- 0.24 MGD
- Design flow
- 0.89 MGD
- NPDES permit
- PA0050504
- Effective
- Permit expires
- March 2027
- Population served
- —
- CWNS 2022
Ridley Creek STP is a publicly owned wastewater treatment works in West Chester, Chester County, Pennsylvania treating an average of 0.24 million gallons per day against a permitted design capacity of 0.89 MGD. Treatment on site includes clarifiers. It discharges under NPDES permit PA0050504 (effective), which expires in March 2027, with 0 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
- 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 Ridley Creek STP.
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Nearby wastewater treatment plants in Pennsylvania
Westchester · 3 mi away
0.24 MGD
West Chester · 4 mi away
3.12 MGD
West Chester · 4 mi away
0.93 MGD
Cheyney · 4 mi away
0.1 MGD
West Chester · 6 mi away
0.73 MGD
Glen Mills · 7 mi away
1.09 MGD
Chadds Ford · 8 mi away
0.12 MGD
Exton · 10 mi away
0.2 MGD
Ridley Creek 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.