Nashua WWTP
Nashua, NH · Hillsborough County · Publicly Owned Treatment Works
- Average flow
- 9.2 MGD
- Design flow
- 16 MGD
- NPDES permit
- NH0100170
- Administratively continued
- Permit expires
- May 2020
- Population served
- 99,918
- CWNS 2022
Nashua WWTP is a publicly owned wastewater treatment works in Nashua, Hillsborough County, New Hampshire treating an average of 9.2 million gallons per day against a permitted design capacity of 16 MGD, serving about 99,918 residents. Treatment on site includes clarifiers, biogas silos, biogas balloons. It discharges under NPDES permit NH0100170 (administratively continued), which expires in May 2020, with 87 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
- 87
- Effluent violations
- 69
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Nashua
Nashua's capital improvement plan lists 16 water, sewer and wastewater line items worth $83M starting 2026–2028. The largest budgeted items are shown here.
All water and sewer capital projects in Nashua →
| Project | Budget | Years |
|---|---|---|
| Class A Biosolids | $25,500,000 | 2027–2027 |
| Annual Sewer Infrastructure Improvements Programs | $24,237,000 | 2026–2031 |
| WW Plant Vehicle Garage | $10,800,000 | 2026–2027 |
| WWPlant Phase I | $6,192,000 | 2026–2026 |
| Annual Stormwater Management/Abatement | $4,851,000 | 2026–2031 |
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
11 verified contacts for Nashua WWTP, with validated emails and direct phone numbers.
Unlock 11 verified contacts (8 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Nashua WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in New Hampshire
Merrimack · 5 mi away
1.37 MGD
Derry · 10 mi away
1.17 MGD
Milford · 11 mi away
0.78 MGD
Hooksett · 22 mi away
0.68 MGD
Allenstown · 26 mi away
0.45 MGD
Epping · 28 mi away
0.13 MGD
Concord · 30 mi away
3.2 MGD
Exeter · 31 mi away
1.1 MGD
Nashua 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 April 5, 2025.