Phoenix, Arizona: water and wastewater capital improvement projects
275 line items · $4.3B · starting 2026–2029 · 1 plan
Phoenix's published capital plans list 275 water, sewer and wastewater line items with a combined planning budget of $4.3B, of which 99 items worth $1.7B sit in the wastewater and sewer departments. The largest single item is Cave Creek Water Reclamation Plant Rehabilitation at $293M (2024–2028). 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 Phoenix
| # | Project | Department | Type | Budget | Years |
|---|---|---|---|---|---|
| 1 | Cave Creek Water Reclamation Plant Rehabilitation | Wastewater | Wastewater treatment plant upgrades | $293M | 2024–2028 |
| 2 | Groundwater Wells | Water Supply | Wells and groundwater | $178M | 2024–2029 |
| 3 | Aquifer Storage | Water Supply | Wells and groundwater | $169M | 2024–2029 |
| 4 | Small Diameter Sewer Rehabilitation | Wastewater | Sewer rehabilitation and I&I | $97M | 2024–2029 |
| 5 | Deer Valley Water Treatment Plant Rehabilitation | Water Supply | Wastewater treatment plant upgrades | $83M | 2025–2029 |
| 6 | Water Main: 48-Inch Zone 4a-Es4 | Water Distribution | Water mains and distribution | $76M | 2026–2028 |
| 7 | Srog Interceptor | Wastewater | Force mains and interceptors | $74M | 2024–2029 |
| 8 | Booster Pump Station Replacement Program | Water Supply | Pump stations | $74M | 2024–2029 |
| 9 | Remote Facilities Rehabilitation And Replacement | Water Supply | Pump stations | $70M | 2024–2029 |
| 10 | Water Treatment Plant Rehabilitation And Replacement | Water Supply | Wastewater treatment plant upgrades | $70M | 2024–2029 |
265 more line items in Phoenix, with descriptions and contacts
Klarifi holds every Phoenix line item with its description, the page it appears on and the source document, plus 14 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
$3.7B
216 items
2026
$393M
25 items
2027
$71M
20 items
2028
$104M
13 items
2029
$785K
1 items
By department
| Department | Line items | Budget | Share |
|---|---|---|---|
| Wastewater | 99 | $1.7B | 40% |
| Water Supply | 85 | $1.9B | 44% |
| Water Distribution | 91 | $690M | 16% |
Project types in Phoenix's plan
Wastewater treatment plants in Phoenix
1 publicly owned treatment plant in Phoenix with 2 permit violations in the last three years. Each profile shows flow, permit, technology and compliance data.
| Plant | Avg flow (MGD) | NPDES | Violations (3y) |
|---|---|---|---|
| 23rd Avenue Wastewater Treatment Plant | 35.67 | AZ0020559 | 2 |
Other Arizona cities with capital plans
Phoenix capital plan questions
Sources and methodology
Budgets and years are as published in Phoenix’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 (275 line items).
Data refreshed September 11, 2026.