Stony Brook Rgnl Sewerage Auth
Hopewell, NJ · Mercer County · Publicly Owned Treatment Works
- Average flow
- 0.14 MGD
- Design flow
- 0.3 MGD
- NPDES permit
- NJ0035301
- Administratively continued
- Permit expires
- December 2025
- Population served
- 1,897
- CWNS 2022
Stony Brook Rgnl Sewerage Auth is a publicly owned wastewater treatment works in Hopewell, Mercer County, New Jersey treating an average of 0.14 million gallons per day against a permitted design capacity of 0.3 MGD, serving about 1,897 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit NJ0035301 (administratively continued), which expires in December 2025, with 4 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Stony Brook Rgnl Sewerage Auth.
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Nearby wastewater treatment plants in New Jersey
Skillman · 2 mi away
0.13 MGD
Skillman · 3 mi away
0.1 MGD
Montgomery · 6 mi away
0.4 MGD
Montgomery · 7 mi away
0.41 MGD
Lawrenceville · 9 mi away
5.5 MGD
Hopewell Twp · 10 mi away
0.06 MGD
Lambertville · 11 mi away
0.6 MGD
East Windsor · 11 mi away
2.38 MGD
Stony Brook Rgnl Sewerage Auth: 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 26, 2025.