Northport (v) STP
Northport, NY · Suffolk County · Publicly Owned Treatment Works
- Average flow
- 0.19 MGD
- Design flow
- 0.45 MGD
- NPDES permit
- NY0024881
- Effective
- Permit expires
- September 2028
- Population served
- 3,324
- CWNS 2022
Northport (v) STP is a publicly owned wastewater treatment works in Northport, Suffolk County, New York treating an average of 0.19 million gallons per day against a permitted design capacity of 0.45 MGD, serving about 3,324 residents. It discharges under NPDES permit NY0024881 (effective), which expires in September 2028, with 8 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
- 8
- Effluent violations
- 8
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Northport (v) STP.
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Nearby wastewater treatment plants in New York
Huntington · 4 mi away
1.58 MGD
Kings Park · 7 mi away
0.24 MGD
Oyster Bay · 9 mi away
1.02 MGD
Stony Brook · 12 mi away
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Glen Cove · 15 mi away
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W Babylon · 15 mi away
26.7 MGD
Farmingville · 17 mi away
0.02 MGD
Rye · 18 mi away
3.3 MGD
Northport (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 September 29, 2025.