Greenwich WPCF
Greenwich, CT · Fairfield County · Publicly Owned Treatment Works
- Average flow
- 5.4 MGD
- Design flow
- 12.5 MGD
- NPDES permit
- CT0100234
- Administratively continued
- Permit expires
- July 2024
- Population served
- 63,514
- CWNS 2022
Greenwich WPCF is a publicly owned wastewater treatment works in Greenwich, Fairfield County, Connecticut treating an average of 5.4 million gallons per day against a permitted design capacity of 12.5 MGD, serving about 63,514 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit CT0100234 (administratively continued), which expires in July 2024, with 5 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
- 5
- Effluent violations
- 5
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Greenwich
Greenwich's capital improvement plan lists 12 water, sewer and wastewater line items worth $277M starting 2025–2030. The largest budgeted items are shown here.
All water and sewer capital projects in Greenwich →
| Project | Budget | Years |
|---|---|---|
| Grass Island Wastewater Treatment Plant - Asset Management | $118,950,000 | 2025–2040 |
| Sewer Rehab | $63,600,000 | 2026–2040 |
| OG Pump Station | $32,000,000 | 2025–2030 |
| Pump Station Rehabilitation | $23,070,000 | 2030–2040 |
| Chapel Lane Pump Station | $14,500,000 | 2028–2030 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
1 verified contact for Greenwich WPCF, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Greenwich WPCF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Connecticut
Stamford · 5 mi away
12.5 MGD
New Canaan · 12 mi away
0.55 MGD
East Norwalk · 13 mi away
9.4 MGD
Westport · 15 mi away
1.46 MGD
Redding · 20 mi away
0.03 MGD
Fairfield · 21 mi away
5.9 MGD
Bridgeport · 24 mi away
16.7 MGD
Bridgeport · 26 mi away
4.1 MGD
Greenwich WPCF: 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 April 23, 2025.