Derry, Town Of, Wastewater Treatment Plant
Derry, NH · Rockingham County · Publicly Owned Treatment Works
- Average flow
- 1.17 MGD
- Design flow
- 4 MGD
- NPDES permit
- NH0100056
- Administratively continued
- Permit expires
- February 2016
- Population served
- 12,300
- CWNS 2022
Derry, Town Of, Wastewater Treatment Plant is a publicly owned wastewater treatment works in Derry, Rockingham County, New Hampshire treating an average of 1.17 million gallons per day against a permitted design capacity of 4 MGD, serving about 12,300 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit NH0100056 (administratively continued), which expires in February 2016, with 17 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
- 17
- Effluent violations
- 15
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Derry
Derry's capital improvement plan lists 26 water, sewer and wastewater line items worth $48M starting 2025–2030. The largest budgeted items are shown here.
All water and sewer capital projects in Derry →
| Project | Budget | Years |
|---|---|---|
| Wastewater Treatment Plant | $14,000,000 | 2027–2027 |
| Water Supply | $7,330,000 | 2025–2025 |
| Collection System/Interceptors | $6,700,000 | 2026–2027 |
| Water Supply | $5,151,432 | 2025–2025 |
| Water Supply | $3,750,000 | 2027–2027 |
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 Derry, Town Of, Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Derry, Town Of, Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in New Hampshire
Merrimack · 8 mi away
1.37 MGD
Nashua · 10 mi away
9.2 MGD
Milford · 15 mi away
0.78 MGD
Hooksett · 16 mi away
0.68 MGD
Epping · 18 mi away
0.13 MGD
Allenstown · 19 mi away
0.45 MGD
Exeter · 22 mi away
1.1 MGD
Concord · 24 mi away
3.2 MGD
Derry, Town Of, Wastewater 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 September 11, 2026; facility record last updated February 16, 2025.