Pease Wastewater Treatment Facility
Portsmouth, NH · Rockingham County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- NHG58A007
- Expired
- Permit expires
- January 2026
- Population served
- 1,000
- CWNS 2022
Pease Wastewater Treatment Facility is a publicly owned wastewater treatment works in Portsmouth, Rockingham County, New Hampshire, serving about 1,000 residents. Treatment on site includes clarifiers. It discharges under NPDES permit NHG58A007 (expired), which expires in January 2026, with 65 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
- 65
- Effluent violations
- 6
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Portsmouth
Portsmouth's capital improvement plan lists 11 water, sewer and wastewater line items worth $74M starting 2025–2027. The largest budgeted items are shown here.
All water and sewer capital projects in Portsmouth →
| Project | Budget | Years |
|---|---|---|
| Mechanic Street Pumping Station Upgrade | $25,550,000 | 2025–2031 |
| Annual Water Line Replacement | $10,000,000 | 2026–2031 |
| Annual Sewer Line Replacement | $9,000,000 | 2026–2031 |
| Wastewater Reuse at Pease Wastewater Treatment Facility | $8,400,000 | 2027–2031 |
| Peirce Island Wastewater Treatment Facility | $4,900,000 | 2025–2027 |
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
Decision-makers at Pease Wastewater Treatment Facility.
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Nearby wastewater treatment plants in New Hampshire
Portsmouth (newington) · 1 mi away
0.1 MGD
Portsmouth · 3 mi away
2.38 MGD
Rye · 5 mi away
0.0021 MGD
Dover · 6 mi away
1.91 MGD
Durham · 7 mi away
0.83 MGD
Newmarket · 7 mi away
0.35 MGD
Exeter · 9 mi away
1.1 MGD
Hampton · 11 mi away
2.08 MGD
Pease 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 February 15, 2025.