Castleton-On-Hudson (v) STP
Castleton-On-Hudson, NY · Rensselaer County · Publicly Owned Treatment Works
- Average flow
- 0.1 MGD
- Design flow
- 0.24 MGD
- NPDES permit
- NY0030970
- Effective
- Permit expires
- May 2031
- Population served
- 1,794
- CWNS 2022
Castleton-On-Hudson (v) STP is a publicly owned wastewater treatment works in Castleton-On-Hudson, Rensselaer County, New York treating an average of 0.1 million gallons per day against a permitted design capacity of 0.24 MGD, serving about 1,794 residents. Treatment on site includes clarifiers. It discharges under NPDES permit NY0030970 (effective), which expires in May 2031, with 151 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 151
- 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 Castleton-On-Hudson (v) STP.
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Nearby wastewater treatment plants in New York
Selkirk · 1 mi away
2.71 MGD
Bethlehem · 5 mi away
0.00049 MGD
Coeymans · 5 mi away
0.4 MGD
New Baltimore · 6 mi away
0.009 MGD
East Schodack · 6 mi away
0.0024 MGD
Albany · 6 mi away
45.11 MGD
Troy · 10 mi away
15.63 MGD
Voorheesville · 12 mi away
0.06 MGD
Castleton-On-Hudson (v) 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 28, 2025.