Montgomery Co Sd#1 STP
Nelliston, NY · Montgomery County · Publicly Owned Treatment Works
- Average flow
- 0.25 MGD
- Design flow
- 1 MGD
- NPDES permit
- NY0107565
- Administratively continued
- Permit expires
- March 2025
- Population served
- 2,965
- CWNS 2022
Montgomery Co Sd#1 STP is a publicly owned wastewater treatment works in Nelliston, Montgomery County, New York treating an average of 0.25 million gallons per day against a permitted design capacity of 1 MGD, serving about 2,965 residents. Treatment on site includes clarifiers. It discharges under NPDES permit NY0107565 (administratively continued), which expires in March 2025, with 2 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
- 2
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Montgomery Co Sd#1 STP.
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Nearby wastewater treatment plants in New York
Canajoharie · 2 mi away
0.24 MGD
Sharon Springs · 8 mi away
0.07 MGD
Johnstown · 12 mi away
4.4 MGD
Fonda · 13 mi away
0.4 MGD
Dolgeville · 14 mi away
0.52 MGD
Little Falls · 14 mi away
3.76 MGD
Cobleskill · 15 mi away
0.003 MGD
Herkimer · 20 mi away
0.5 MGD
Montgomery Co Sd#1 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 May 21, 2025.