Carmel (t) Sd No.4 STP
North Road, Mahopac, NY 10541 · Putnam County · Publicly Owned Treatment Works
- Average flow
- 0.13 MGD
- Design flow
- 0.2 MGD
- NPDES permit
- NY0105252
- Administratively continued
- Permit expires
- May 2019
- Population served
- 1,662
- CWNS 2022
Carmel (t) Sd No.4 STP is a publicly owned wastewater treatment works in Mahopac, Putnam County, New York treating an average of 0.13 million gallons per day against a permitted design capacity of 0.2 MGD, serving about 1,662 residents. It discharges under NPDES permit NY0105252 (administratively continued), which expires in May 2019, with 6 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in October 2022.
Treatment technology
Treatment structures and unit processes at Carmel (t) Sd No.4 STP.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 6
- Effluent violations
- 6
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Carmel (t) Sd No.4 STP in EPA's ICIS system.
- Formal actions
- 1
- 1 since FY2020
- Compliance actions
- $5,000
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Oct 2022
Town of Carmel Sewer District No. 4
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty · Compliance actions $5,000
EPA's description of the case:
“This ACO has been developed to enforce SPDES permit requirements regarding proper O&M of the sanitary sewer system.”
Source: EPA ECHO, civil enforcement case 02-2022-3032.
Full case history with a free Klarifi account
Every action against Carmel (t) Sd No.4 STP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Carmel (t) Sd No.4 STP.
No verified contacts on file yet
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Nearby wastewater treatment plants in New York
Mahopac · 2 mi away
0.03 MGD
Mahopac · 3 mi away
0.03 MGD
Mahopac · 3 mi away
0.04 MGD
Carmel · 4 mi away
0.15 MGD
Carmel · 7 mi away
0.71 MGD
Yorktown Hgts · 7 mi away
1.76 MGD
Goldens Bridge · 9 mi away
0.03 MGD
Brewster · 9 mi away
0.12 MGD
Carmel (t) Sd No.4 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 October 26, 2026; facility record last updated November 28, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms