Arizona water and wastewater capital improvement plans
518 planned projects · $8.2B · 4 cities · 4 plans
The 4 capital improvement plans and adopted budgets Klarifi has extracted for Arizona list 518 water, sewer and wastewater line items with a combined planning budget of $8.2B across 4 cities. Phoenix has the largest plan at $4.3B. 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 Arizona with water and sewer capital plans
| # | City | Line items | Budget | Plans |
|---|---|---|---|---|
| 1 | Phoenix | 275 | $4.3B | 1 |
| 2 | Gilbert | 154 | $2.2B | 1 |
| 3 | Mesa | 58 | $1.5B | 1 |
| 4 | Buckeye | 31 | $307M | 1 |
Planned spend by start year
Before 2026
$6.5B
371 items
2026
$573M
42 items
2027
$586M
38 items
2028
$256M
23 items
2029
$16M
8 items
2030
$283M
36 items
By department
| Department | Line items | Budget | Share |
|---|---|---|---|
| Wastewater | 174 | $2.6B | 32% |
| Sewer | 30 | $321M | 4% |
| Water Supply | 168 | $3.6B | 44% |
| Water Distribution | 146 | $1.6B | 20% |
Project types in Arizona
The largest planned projects in Arizona
| # | Project | City | Type | Budget | Years |
|---|---|---|---|---|---|
| 1 | NWTP Expansion and Reconstruction | Gilbert, AZ | Water treatment plants | $579M | 2025–2026 |
| 2 | Cave Creek Water Reclamation Plant Rehabilitation | Phoenix, AZ | Wastewater treatment plant upgrades | $293M | 2024–2028 |
| 3 | ACP Water Line Replacements | Gilbert, AZ | Water mains and distribution | $274M | 2027–2034 |
| 4 | Central Mesa Reuse Pipeline Project | Mesa, AZ | Water mains and distribution | $222M | 2023–2029 |
| 5 | Signal Butte Water Treatment Plant Expansion | Mesa, AZ | Wastewater treatment plant upgrades | $208M | 2023–2029 |
| 6 | Groundwater Wells | Phoenix, AZ | Wells and groundwater | $178M | 2024–2029 |
| 7 | Aquifer Storage | Phoenix, AZ | Wells and groundwater | $169M | 2024–2029 |
| 8 | GWRP Expansion Phase 4 | Gilbert, AZ | Wastewater treatment plant upgrades | $124M | 2026–2027 |
| 9 | Small Diameter Sewer Rehabilitation | Phoenix, AZ | Sewer rehabilitation and I&I | $97M | 2024–2029 |
| 10 | Advanced Metering Infrastructure (AMI) | Mesa, AZ | Meters and AMI | $97M | 2023–2028 |
All 518 Arizona 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.
Arizona 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.