Boise, Idaho: water and wastewater capital improvement projects
11 line items · $672M · starting 2026 · 1 plan
Boise's published capital plans list 11 water, sewer and wastewater line items with a combined planning budget of $672M, of which 7 items worth $481M sit in the wastewater and sewer departments. The largest single item is Recycled Water Facility at $294M (2026–2030). The ten largest items are listed below; the full list with descriptions and page references is in Klarifi.
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.
The largest water and sewer projects in Boise
| # | Project | Department | Type | Budget | Years |
|---|---|---|---|---|---|
| 1 | Recycled Water Facility | Wastewater | Water reuse and reclaimed water | $294M | 2026–2030 |
| 2 | Lander Street Water Renewal Facility | Water Distribution | Biosolids, sludge and dewatering | $155M | 2026–2030 |
| 3 | West Boise Water Renewal Facility | Wastewater | Anaerobic digesters and biogas | $128M | 2026–2030 |
| 4 | Collection System | Sewer | Sewer rehabilitation and I&I | $40M | 2026–2030 |
| 5 | Major Equipment | Water Supply | Vehicles and equipment | $29M | 2026–2030 |
| 6 | Water Renewal Percent For Art | Wastewater | Planning, studies and asset management | $7M | 2026–2030 |
| 7 | Enchance The River | Water Supply | — | $7M | 2026–2030 |
| 8 | Phosphorus Management Planning | Wastewater | Nutrient removal | $6M | 2026–2030 |
| 9 | Phosphorus Removal Facility | Wastewater | Nutrient removal | $5M | 2026–2030 |
| 10 | Twenty-Mile South Farm | Wastewater | Biosolids, sludge and dewatering | $2M | 2026–2030 |
1 more line items in Boise, with descriptions and contacts
Klarifi holds every Boise line item with its description, the page it appears on and the source document. Track new plans as they are adopted and compare with similar projects in other cities.
Planned spend by start year
2026
$672M
11 items
By department
| Department | Line items | Budget | Share |
|---|---|---|---|
| Wastewater | 6 | $441M | 66% |
| Sewer | 1 | $40M | 6% |
| Water Supply | 3 | $36M | 5% |
| Water Distribution | 1 | $155M | 23% |
Project types in Boise's plan
Wastewater treatment plants in Boise
No publicly owned treatment plant is recorded under Boise in the facility directory; the city may be served by a regional plant listed under another municipality. Browse all plants in Idaho.
Other Idaho cities with capital plans
Boise capital plan questions
Sources and methodology
Budgets and years are as published in Boise’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.
Documents: Adopted Budget 2026 (11 line items).
Data refreshed September 11, 2026.