Leavitt E. Magrath Wastewater Treatment Facility
Hampton, NH · Rockingham County · Publicly Owned Treatment Works
- Average flow
- 2.08 MGD
- Design flow
- 4.7 MGD
- NPDES permit
- NH0100625
- Expired
- Permit expires
- February 2026
- Population served
- 17,009
- CWNS 2022
Leavitt E. Magrath Wastewater Treatment Facility is a publicly owned wastewater treatment works in Hampton, Rockingham County, New Hampshire treating an average of 2.08 million gallons per day against a permitted design capacity of 4.7 MGD, serving about 17,009 residents. Treatment on site includes clarifiers. It discharges under NPDES permit NH0100625 (expired), which expires in February 2026, with 27 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
- 27
- Effluent violations
- 27
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Hampton
Hampton's capital improvement plan lists 2 water, sewer and wastewater line items worth $29M starting 2025–2025. The largest budgeted items are shown here.
| Project | Budget | Years |
|---|---|---|
| Wastewater Treatment Plant Projects | $19,145,000 | 2025–2030 |
| Sewer Main Projects | $10,221,200 | 2025–2030 |
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
Decision-makers at Leavitt E. Magrath Wastewater Treatment Facility.
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Nearby wastewater treatment plants in New Hampshire
Exeter · 8 mi away
1.1 MGD
Rye · 8 mi away
0.0021 MGD
Portsmouth · 11 mi away
2.38 MGD
Portsmouth · 11 mi away
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Newmarket · 12 mi away
0.35 MGD
Portsmouth (newington) · 12 mi away
0.1 MGD
Epping · 15 mi away
0.13 MGD
Durham · 15 mi away
0.83 MGD
Leavitt E. Magrath 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.