Caldwell Boro MUA Caldwell WWTP
West Caldwell, NJ · Essex County · Publicly Owned Treatment Works
- Average flow
- 2.98 MGD
- Design flow
- 4.5 MGD
- NPDES permit
- NJ0020427
- Effective
- Permit expires
- September 2028
- Population served
- 33,305
- CWNS 2022
Caldwell Boro MUA Caldwell WWTP is a publicly owned wastewater treatment works in West Caldwell, Essex County, New Jersey treating an average of 2.98 million gallons per day against a permitted design capacity of 4.5 MGD, serving about 33,305 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches, biogas balloons. It discharges under NPDES permit NJ0020427 (effective), which expires in September 2028, with 68 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
- 68
- Effluent violations
- 68
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Caldwell Boro MUA Caldwell WWTP.
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Nearby wastewater treatment plants in New Jersey
Parsippany · 2 mi away
7.98 MGD
Lincoln Park · 5 mi away
4.45 MGD
Boonton · 6 mi away
9.09 MGD
Wayne · 6 mi away
5.72 MGD
Chatham · 7 mi away
1.91 MGD
Morristown · 8 mi away
2.57 MGD
Kinnelon · 9 mi away
0.00077 MGD
Greystone Park · 10 mi away
0.17 MGD
Caldwell Boro MUA Caldwell WWTP: 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 March 20, 2025.