Marlboro WWTP
Marlboro, NY · Ulster County · Publicly Owned Treatment Works
- Average flow
- 0.09 MGD
- Design flow
- 0.18 MGD
- NPDES permit
- NY0109720
- Effective
- Permit expires
- July 2027
- Population served
- 883
- CWNS 2022
Marlboro WWTP is a publicly owned wastewater treatment works in Marlboro, Ulster County, New York treating an average of 0.09 million gallons per day against a permitted design capacity of 0.18 MGD, serving about 883 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit NY0109720 (effective), which expires in July 2027, with 4 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
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 Marlboro WWTP.
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Nearby wastewater treatment plants in New York
Wappingers Falls · 1 mi away
1.19 MGD
Wappingers Falls · 3 mi away
0.04 MGD
Wappingers Falls · 4 mi away
0.02 MGD
Wappingers Falls · 6 mi away
0.04 MGD
Fishkill · 6 mi away
0.41 MGD
Poughkeepsie · 7 mi away
0.01 MGD
Beacon · 8 mi away
2.57 MGD
Highland · 8 mi away
0.76 MGD
Marlboro WWTP: 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.