Avondale Boro STP
Avondale, PA · Chester County · Publicly Owned Treatment Works
- Average flow
- 0.29 MGD
- Design flow
- 0.5 MGD
- NPDES permit
- PA0025488
- Effective
- Permit expires
- May 2029
- Population served
- —
- CWNS 2022
Avondale Boro STP is a publicly owned wastewater treatment works in Avondale, Chester County, Pennsylvania treating an average of 0.29 million gallons per day against a permitted design capacity of 0.5 MGD. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit PA0025488 (effective), which expires in May 2029, with 10 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
- 10
- Effluent violations
- 8
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Avondale Boro STP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Avondale Boro STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Pennsylvania
West Grove · 3 mi away
0.17 MGD
Kennett Square · 3 mi away
0.53 MGD
Coatesville · 10 mi away
0.16 MGD
Chadds Ford · 11 mi away
0.12 MGD
Atglen · 13 mi away
0.08 MGD
West Chester · 13 mi away
0.73 MGD
West Chester · 14 mi away
0.93 MGD
Atglen · 14 mi away
0.12 MGD
Avondale Boro 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 March 14, 2025.