St Thomas Twp STP
Chambersburg, PA · Franklin County · Publicly Owned Treatment Works
- Average flow
- 0.16 MGD
- Design flow
- 0.4 MGD
- NPDES permit
- PA0081001
- Effective
- Permit expires
- January 2028
- Population served
- —
- CWNS 2022
St Thomas Twp STP is a publicly owned wastewater treatment works in Chambersburg, Franklin County, Pennsylvania treating an average of 0.16 million gallons per day against a permitted design capacity of 0.4 MGD. It discharges under NPDES permit PA0081001 (effective), which expires in January 2028, with 13 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 13
- Effluent violations
- 13
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for St Thomas Twp STP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at St Thomas Twp STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Pennsylvania
Chambersburg · 4 mi away
5.16 MGD
Chambersburg · 5 mi away
0.01 MGD
Greencastle · 7 mi away
0.02 MGD
Mercersburg · 8 mi away
0.05 MGD
Mercersburg · 8 mi away
0.04 MGD
Greencastle · 8 mi away
0.27 MGD
Mercersburg · 9 mi away
0.11 MGD
Mont Alto · 11 mi away
0.07 MGD
St Thomas Twp 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 October 2, 2025.