Cornwall (t) Firthcliff STP
Cornwall, NY · Orange County · Publicly Owned Treatment Works
- Average flow
- 0.04 MGD
- Design flow
- 0.12 MGD
- NPDES permit
- NY0022152
- Effective
- Permit expires
- June 2030
- Population served
- 1,118
- CWNS 2022
Cornwall (t) Firthcliff STP is a publicly owned wastewater treatment works in Cornwall, Orange County, New York treating an average of 0.04 million gallons per day against a permitted design capacity of 0.12 MGD, serving about 1,118 residents. It discharges under NPDES permit NY0022152 (effective), which expires in June 2030, with 3 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
- 3
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Cornwall (t) Firthcliff STP.
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Nearby wastewater treatment plants in New York
Newburgh · 1 mi away
3 MGD
Cornwall · 1 mi away
0.57 MGD
Newburgh · 4 mi away
5.4 MGD
Beacon · 5 mi away
2.57 MGD
Cold Spring · 5 mi away
0.2 MGD
Washingtonville · 5 mi away
0.39 MGD
Washingtonville · 6 mi away
0.0054 MGD
Highland Mills · 7 mi away
0.02 MGD
Cornwall (t) Firthcliff 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 September 26, 2025.