Williamstown Boro STP
Williamstown, PA · Dauphin County · Publicly Owned Treatment Works
- Average flow
- 0.13 MGD
- Design flow
- 0.45 MGD
- NPDES permit
- PA0021491
- Effective
- Permit expires
- August 2027
- Population served
- —
- CWNS 2022
Williamstown Boro STP is a publicly owned wastewater treatment works in Williamstown, Dauphin County, Pennsylvania treating an average of 0.13 million gallons per day against a permitted design capacity of 0.45 MGD. Treatment on site includes uncovered lagoons. It discharges under NPDES permit PA0021491 (effective), which expires in August 2027, with 60 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 60
- Effluent violations
- 15
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Williamstown Boro STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Williamstown Boro STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Pennsylvania
Tower City · 2 mi away
0.4 MGD
Wiconisco · 4 mi away
0.03 MGD
Lykens · 5 mi away
0.09 MGD
Gratz · 6 mi away
0.04 MGD
Elizabethville · 7 mi away
0.02 MGD
Jonestown · 10 mi away
0.02 MGD
Elizabethville · 10 mi away
0.12 MGD
Berrysburg · 10 mi away
0.01 MGD
Williamstown 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 November 27, 2025.