Suncook Wastewater Treatment Facility
Allenstown, NH · Merrimack County · Publicly Owned Treatment Works
- Average flow
- 0.45 MGD
- Design flow
- 1.5 MGD
- NPDES permit
- NH0101390
- Effective
- Permit expires
- January 2027
- Population served
- 9,217
- CWNS 2022
Suncook Wastewater Treatment Facility is a publicly owned wastewater treatment works in Allenstown, Merrimack County, New Hampshire treating an average of 0.45 million gallons per day against a permitted design capacity of 1.5 MGD, serving about 9,217 residents. Treatment on site includes clarifiers. It discharges under NPDES permit NH0101390 (effective), which expires in January 2027, with 9 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 9
- Effluent violations
- 8
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Suncook Wastewater Treatment Facility, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Suncook Wastewater Treatment Facility, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in New Hampshire
Hooksett · 4 mi away
0.68 MGD
Concord · 5 mi away
3.2 MGD
Concord · 12 mi away
0.18 MGD
Hopkington · 13 mi away
0.03 MGD
Henniker · 18 mi away
0.11 MGD
Derry · 19 mi away
1.17 MGD
Epping · 21 mi away
0.13 MGD
Merrimack · 22 mi away
1.37 MGD
Suncook Wastewater Treatment Facility: 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 May 21, 2025.