Millbrook Sewage Treatment Plant
39 North Ave, Millbrook, NY 12545 · Dutchess County · Publicly Owned Treatment Works
- Average flow
- 0.14 MGD
- Design flow
- 0.37 MGD
- NPDES permit
- NY0025429
- Effective
- Permit expires
- December 2030
- Population served
- 1,443
- CWNS 2022
Millbrook Sewage Treatment Plant is a publicly owned wastewater treatment works in Millbrook, Dutchess County, New York treating an average of 0.14 million gallons per day against a permitted design capacity of 0.37 MGD, serving about 1,443 residents. It discharges under NPDES permit NY0025429 (effective), which expires in December 2030, with 80 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in August 2026.
Treatment technology
Treatment structures and unit processes at Millbrook Sewage Treatment Plant.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 80
- Effluent violations
- 26
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 Millbrook Sewage Treatment Plant in EPA's ICIS system.
- Formal actions
- 2
- 2 since FY2020
- Compliance actions
- $103,000
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Aug 2026
Village of Millbrook - STP
Administrative order · CWA, Effluent Limitations - NPDES Toxic & Pretreatment Effluent Standards · Final Order No Penalty · Compliance actions $100,000
EPA's description of the case:
“Violations of the operation of the Overflow Reduction Facility, portions of the WWTP and effluent limit exceedances.”
Source: EPA ECHO, civil enforcement case 02-2025-3002.
Full case history with a free Klarifi account
Every action against Millbrook Sewage Treatment Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Millbrook Sewage Treatment Plant.
No verified contacts on file yet
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Nearby wastewater treatment plants in New York
Pleasant Valley · 7 mi away
0.02 MGD
Hyde Park · 9 mi away
0.08 MGD
Poughquag · 11 mi away
0.02 MGD
Hyde Park · 12 mi away
0.01 MGD
Poughkeepsie · 12 mi away
0.02 MGD
Rhinebeck · 13 mi away
0.003 MGD
Poughkeepsie · 13 mi away
7.39 MGD
Highland · 14 mi away
1.1 MGD
Millbrook Sewage Treatment Plant: 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