Stage Ii Treatment Plant
525 County Rd 605, Montgomery, NJ 08502 · Somerset County · Publicly Owned Treatment Works
- Average flow
- 0.43 MGD
- Design flow
- —
- NPDES permit
- NJ0026905
- Effective
- Permit expires
- September 2027
- Population served
- 5,386
- CWNS 2022
Stage Ii Treatment Plant is a publicly owned wastewater treatment works in Montgomery, Somerset County, New Jersey treating an average of 0.43 million gallons per day, serving about 5,386 residents. It discharges under NPDES permit NJ0026905 (effective), which expires in September 2027, with 42 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Stage Ii Treatment Plant.
Available with a free Klarifi account
See the full treatment train at Stage Ii Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 42
- Effluent violations
- 28
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Stage Ii Treatment Plant.
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Nearby wastewater treatment plants in New Jersey
Skillman · 3 mi away
0.13 MGD
Montgomery · 4 mi away
0.56 MGD
Skillman · 4 mi away
0.16 MGD
Hopewell · 6 mi away
0.19 MGD
East Windsor · 8 mi away
2.53 MGD
Hightstown · 10 mi away
0.28 MGD
Bridgewater · 11 mi away
16.4 MGD
Lawrenceville · 11 mi away
7.31 MGD
Stage Ii Treatment Plant: 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 October 26, 2026; facility record last updated November 28, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms