Carroll Valley - Main STP
Fairfield, PA · Adams County · Publicly Owned Treatment Works
- Average flow
- 0.07 MGD
- Design flow
- 0.25 MGD
- NPDES permit
- PA0080039
- Effective
- Permit expires
- May 2030
- Population served
- 3,940
- CWNS 2022
Carroll Valley - Main STP is a publicly owned wastewater treatment works in Fairfield, Adams County, Pennsylvania treating an average of 0.07 million gallons per day against a permitted design capacity of 0.25 MGD, serving about 3,940 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit PA0080039 (effective), which expires in May 2030, with 4 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
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Carroll Valley - Main STP.
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Nearby wastewater treatment plants in Pennsylvania
Fairfield · 2 mi away
0.16 MGD
Gettysburg · 7 mi away
0.19 MGD
Gettysburg · 10 mi away
0.14 MGD
Waynesboro · 11 mi away
0.16 MGD
Arendtsville · 11 mi away
0.04 MGD
Mont Alto · 11 mi away
0.07 MGD
Gettysburg · 13 mi away
0.12 MGD
Biglerville · 13 mi away
0.13 MGD
Carroll Valley - Main 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 26, 2025.