Delcora-Western Regional Treatment Plant
Chester, PA · Delaware County · Publicly Owned Treatment Works
- Average flow
- 27.54 MGD
- Design flow
- 44 MGD
- NPDES permit
- PA0027103
- Expired
- Permit expires
- March 2026
- Population served
- 107,437
- CWNS 2022
Delcora-Western Regional Treatment Plant is a publicly owned wastewater treatment works in Chester, Delaware County, Pennsylvania treating an average of 27.54 million gallons per day against a permitted design capacity of 44 MGD, serving about 107,437 residents. Treatment on site includes clarifiers. It discharges under NPDES permit PA0027103 (expired), which expires in March 2026, 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
- 18
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Delcora-Western Regional Treatment Plant, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Delcora-Western Regional Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Pennsylvania
Brookhaven · 3 mi away
0.12 MGD
Lester · 6 mi away
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Glen Mills · 7 mi away
1.09 MGD
Cheyney · 10 mi away
0.1 MGD
Chadds Ford · 11 mi away
0.12 MGD
Westchester · 12 mi away
0.24 MGD
West Chester · 13 mi away
3.12 MGD
West Chester · 13 mi away
0.24 MGD
Delcora-Western Regional 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 May 25, 2025.