Sioux City, Iowa: water and wastewater capital improvement projects
28 line items · $260M · starting 2026–2028 · 1 plan
Sioux City's published capital plans list 28 water, sewer and wastewater line items with a combined planning budget of $260M, of which 9 items worth $196M sit in the wastewater and sewer departments. The largest single item is WWTP Facility Plan Improvements at $170M (2027–2028). 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 Sioux City
| # | Project | Department | Type | Budget | Years |
|---|---|---|---|---|---|
| 1 | WWTP Facility Plan Improvements | Wastewater | Wastewater treatment plant upgrades | $170M | 2027–2028 |
| 2 | Annual Water System Improvements | Water Supply | Water mains and distribution | $12M | 2026–2030 |
| 3 | Outer Drive Pressure and Storage | Water Supply | Pump stations | $12M | 2028 |
| 4 | Annual Sanitary Sewer Improvements | Sewer | Sewer rehabilitation and I&I | $11M | 2026–2030 |
| 5 | Annual Undersized Water Main Replacements | Water Distribution | Water mains and distribution | $9M | 2026–2030 |
| 6 | Pour Backs | Water Supply | Water mains and distribution | $7M | 2026–2030 |
| 7 | Unplanned Storm Sewer | Sewer | Sewer rehabilitation and I&I | $5M | 2026–2030 |
| 8 | Unplanned Water Main Replacement | Water Distribution | Water mains and distribution | $5M | 2026–2030 |
| 9 | Harbor Drive/Hwy 75 Water Main Upsize | Water Distribution | Water mains and distribution | $5M | 2026–2027 |
| 10 | Utility Lining Improvements | Water Supply | Sewer rehabilitation and I&I | $4M | 2026–2030 |
18 more line items in Sioux City, with descriptions and contacts
Klarifi holds every Sioux City line item with its description, the page it appears on and the source document, plus 2 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
2026
$72M
19 items
2027
$176M
6 items
2028
$12M
3 items
By department
| Department | Line items | Budget | Share |
|---|---|---|---|
| Wastewater | 4 | $172M | 66% |
| Sewer | 5 | $23M | 9% |
| Water Supply | 14 | $42M | 16% |
| Water Distribution | 5 | $23M | 9% |
Project types in Sioux City's plan
Wastewater treatment plants in Sioux City
1 publicly owned treatment plant in Sioux City with 10 permit violations in the last three years. Each profile shows flow, permit, technology and compliance data.
| Plant | Avg flow (MGD) | NPDES | Violations (3y) |
|---|---|---|---|
| City Of Sioux City STP | — | IA0043095 | 10 |
Other Iowa cities with capital plans
Sioux City capital plan questions
Sources and methodology
Budgets and years are as published in Sioux 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.
Documents: CIP 2026–2030 (28 line items).
Data refreshed September 11, 2026.