Longmont, Colorado: water and wastewater capital improvement projects
20 line items · $250M · starting 2026–2029 · 1 plan
Longmont's published capital plans list 20 water, sewer and wastewater line items with a combined planning budget of $250M, of which 6 items worth $72M sit in the wastewater and sewer departments. The largest single item is Nelson-Flanders WTP Expansion at $95M (2026–2028). 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 Longmont
| # | Project | Department | Type | Budget | Years |
|---|---|---|---|---|---|
| 1 | Nelson-Flanders WTP Expansion | Water Supply | Water treatment plants | $95M | 2026–2028 |
| 2 | Water Distribution Rehabilitation and Improvements | Water Distribution | Water mains and distribution | $43M | 2025–2029 |
| 3 | Digester No. 4 | Sewer | Anaerobic digesters and biogas | $30M | 2027–2029 |
| 4 | WWTP Permit Regulatory Improvements | Sewer | Wastewater treatment plant upgrades | $23M | 2025–2029 |
| 5 | Sanitary Sewer Rehabilitation and Improvements | Sewer | Sewer rehabilitation and I&I | $11M | 2025–2029 |
| 6 | Meter and AMR Replacement | Water Distribution | Meters and AMI | $9M | 2025–2029 |
| 7 | Water Utility Monitoring and Control System | Water Supply | SCADA, controls and instrumentation | $8M | 2025–2029 |
| 8 | Ralph Price Reservoir Improvements | Water Supply | Storage tanks and reservoirs | $8M | 2025–2029 |
| 9 | Raw Water Irrigation & Park Pond Improvements | Water Supply | Lagoons and ponds | $4M | 2025–2027 |
| 10 | Collection System Capacity Improvements | Sewer | Sewer rehabilitation and I&I | $4M | 2028–2029 |
10 more line items in Longmont, with descriptions and contacts
Klarifi holds every Longmont 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
Before 2026
$116M
14 items
2026
$97M
2 items
2027
$30M
1 items
2028
$4M
1 items
2029
$3M
2 items
By department
| Department | Line items | Budget | Share |
|---|---|---|---|
| Sewer | 6 | $72M | 29% |
| Water Supply | 11 | $125M | 50% |
| Water Distribution | 3 | $52M | 21% |
Project types in Longmont's plan
Wastewater treatment plants in Longmont
No publicly owned treatment plant is recorded under Longmont in the facility directory; the city may be served by a regional plant listed under another municipality. Browse all plants in Colorado.
Other Colorado cities with capital plans
Longmont capital plan questions
Sources and methodology
Budgets and years are as published in Longmont’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: CIP 2025–2029 (20 line items).
Data refreshed September 11, 2026.