North Castle (t) Sd#2
Armonk, NY · Westchester County · Publicly Owned Treatment Works
- Average flow
- 0.31 MGD
- Design flow
- 0.45 MGD
- NPDES permit
- NY0109584
- Administratively continued
- Permit expires
- February 2022
- Population served
- 2,701
- CWNS 2022
North Castle (t) Sd#2 is a publicly owned wastewater treatment plant in Armonk, Westchester County, New York treating an average of 0.31 million gallons per day against a permitted design capacity of 0.45 MGD, serving about 2,701 residents. It discharges under NPDES permit NY0109584 (administratively continued), which expires in February 2022, 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 North Castle (t) Sd#2.
No verified contacts on file yet
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Nearby wastewater treatment plants in New York
Ossining · 9 mi away
3.32 MGD
Rye · 11 mi away
3.3 MGD
Mamaroneck · 12 mi away
11 MGD
South Salem · 12 mi away
0.03 MGD
Yorktown Hgts · 12 mi away
1 MGD
Goldens Bridge · 13 mi away
0.02 MGD
Orangeburg · 13 mi away
5.18 MGD
New Rochelle · 15 mi away
9 MGD
North Castle (t) Sd#2: 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 29, 2025.