Gilbert, Arizona: water and wastewater capital improvement projects
154 line items · $2.2B · starting 2026–2030 · 1 plan
Gilbert's published capital plans list 154 water, sewer and wastewater line items with a combined planning budget of $2.2B, of which 63 items worth $564M sit in the wastewater and sewer departments. The largest single item is NWTP Expansion and Reconstruction at $579M (2025–2026). 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 Gilbert
| # | Project | Department | Type | Budget | Years |
|---|---|---|---|---|---|
| 1 | NWTP Expansion and Reconstruction | Water Supply | Water treatment plants | $579M | 2025–2026 |
| 2 | ACP Water Line Replacements | Water Distribution | Water mains and distribution | $274M | 2027–2034 |
| 3 | GWRP Expansion Phase 4 | Wastewater | Wastewater treatment plant upgrades | $124M | 2026–2027 |
| 4 | Islands Water Line Replacement | Water Distribution | Water mains and distribution | $85M | 2028–2034 |
| 5 | System Wide Force Main Retrofit | Sewer | Force mains and interceptors | $76M | 2025–2034 |
| 6 | Water Rights Resiliency and Capacity | Water Supply | Stormwater and flood resilience | $47M | 2027–2028 |
| 7 | NWTP FWPS and Reservoir Replacement | Water Supply | Storage tanks and reservoirs | $40M | 2030–2034 |
| 8 | Elliot Rd Reclaimed Line | Sewer | Water reuse and reclaimed water | $38M | 2030–2034 |
| 9 | Site 34 Well and Reservoir | Water Supply | Storage tanks and reservoirs | $30M | 2025–2029 |
| 10 | Aquifer Storage and Recovery Wells | Wastewater | Wells and groundwater | $28M | 2025–2026 |
144 more line items in Gilbert, with descriptions and contacts
Klarifi holds every Gilbert line item with its description, the page it appears on and the source document, plus 4 verified contacts at the city’s treatment plants. Track new plans as they are adopted and compare with similar projects in other cities.
Planned spend by start year
Before 2026
$1.1B
73 items
2026
$168M
14 items
2027
$450M
16 items
2028
$152M
10 items
2029
$13M
5 items
2030
$283M
36 items
By department
| Department | Line items | Budget | Share |
|---|---|---|---|
| Wastewater | 35 | $257M | 12% |
| Sewer | 28 | $307M | 14% |
| Water Supply | 56 | $1.1B | 51% |
| Water Distribution | 35 | $489M | 23% |
Project types in Gilbert's plan
Wastewater treatment plants in Gilbert
1 publicly owned treatment plant in Gilbert. Each profile shows flow, permit, technology and compliance data.
| Plant | Avg flow (MGD) | NPDES | Violations (3y) |
|---|---|---|---|
| City Of Mesa - Greenfield Water Reclamation Plant | 0.03 | AZ0025241 | 0 |
Other Arizona cities with capital plans
Gilbert capital plan questions
Sources and methodology
Budgets and years are as published in Gilbert’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 2025–2034 (154 line items).
Data refreshed September 11, 2026.