New Hampshire water and wastewater capital improvement plans
370 planned projects · $706M · 17 cities · 17 plans
The 17 capital improvement plans and adopted budgets Klarifi has extracted for New Hampshire list 370 water, sewer and wastewater line items with a combined planning budget of $706M across 17 cities. Rochester has the largest plan at $138M. Each city page lists its largest projects with budgets and years, links the source document and the city's treatment plants.
A capital improvement plan (CIP) is a city’s multi-year budget for building and replacing infrastructure. The water, sewer and wastewater sections list each project with its budget and the years it is funded, which makes them the earliest public signal that a plant, pump station or pipe network is about to be upgraded, usually two to four years before a contract is awarded.
Cities in New Hampshire with water and sewer capital plans
| # | City | Line items | Budget | Plans |
|---|---|---|---|---|
| 1 | Rochester | 65 | $138M | 1 |
| 2 | Dover | 38 | $107M | 1 |
| 3 | Nashua | 16 | $83M | 1 |
| 4 | Portsmouth | 11 | $74M | 1 |
| 5 | Keene | 42 | $66M | 1 |
| 6 | Hanover | 87 | $64M | 1 |
| 7 | Derry | 26 | $48M | 1 |
| 8 | Pittsfield | 8 | $24M | 1 |
| 9 | Newmarket | 13 | $18M | 1 |
| 10 | Seabrook | 10 | $17M | 1 |
| 11 | Exeter | 9 | $14M | 1 |
| 12 | Franklin | 23 | $13M | 1 |
| 13 | Hooksett | 7 | $6M | 1 |
| 14 | Berlin | 8 | $3M | 1 |
| 15 | Milford | 3 | $2M | 1 |
Planned spend by start year
Before 2026
$191M
75 items
2026
$296M
125 items
2027
$103M
42 items
2028
$27M
30 items
2029
$24M
20 items
2030
$8M
19 items
2031
$7M
3 items
2032 and later
$36M
51 items
Unscheduled
$15M
5 items
By department
| Department | Line items | Budget | Share |
|---|---|---|---|
| Wastewater | 132 | $326M | 46% |
| Sewer | 85 | $161M | 23% |
| Water Supply | 91 | $104M | 15% |
| Water Distribution | 62 | $115M | 16% |
Project types in New Hampshire
The largest planned projects in New Hampshire
| # | Project | City | Type | Budget | Years |
|---|---|---|---|---|---|
| 1 | Wastewater Treatment Plant Upgrade to meet Permit | Rochester, NH | Wastewater treatment plant upgrades | $50M | 2026–2031 |
| 2 | Mechanic Street Pumping Station Upgrade | Portsmouth, NH | Pump stations | $26M | 2025–2031 |
| 3 | Class A Biosolids | Nashua, NH | Biosolids, sludge and dewatering | $26M | 2027 |
| 4 | Annual Sewer Infrastructure Improvements Programs | Nashua, NH | Sewer rehabilitation and I&I | $24M | 2026–2031 |
| 5 | Nitrogen Removal & Facility upgrade | Hanover, NH | Nutrient removal | $22M | 2049 |
| 6 | Wastewater Treatment Plant Projects | Hampton, NH | Wastewater treatment plant upgrades | $19M | 2025–2030 |
| 7 | Pump Station Replacement Program | Rochester, NH | Pump stations | $15M | 2026–2031 |
| 8 | Wastewater Treatment Plant | Derry, NH | Wastewater treatment plant upgrades | $14M | 2027 |
| 9 | Pump Station Upgrades | Seabrook, NH | Pump stations | $13M | 2025–2029 |
| 10 | WWTP Sludge Dryer Project | Keene, NH | Biosolids, sludge and dewatering | $13M | 2026–2030 |
All 370 New Hampshire line items in Klarifi
Every project with its description, page reference and source document, filterable by city, department, type, budget and year, linked to the plants and decision-makers in each city.
New Hampshire capital plan questions
Sources and methodology
Budgets and years are as published in each city’s capital improvement plan or adopted budget. Klarifi extracts the water, sewer and wastewater line items from the published document, keeps the page reference for each one, and assigns a project type from the title and description with a keyword classifier. Figures are planning budgets, not awarded contracts, and can change when a plan is re-adopted.
Data refreshed September 11, 2026.