O Fallon, Illinois: water and wastewater capital improvement projects
21 line items · $32M · starting 2026–2029 · 1 plan
O Fallon's published capital plans list 21 water, sewer and wastewater line items with a combined planning budget of $32M, of which 8 items worth $18M sit in the wastewater and sewer departments. The largest single item is South Cherry Street Rehabilitation at $4M (2027). 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 O Fallon
| # | Project | Department | Type | Budget | Years |
|---|---|---|---|---|---|
| 1 | South Cherry Street Rehabilitation | Sewer | Sewer rehabilitation and I&I | $4M | 2027 |
| 2 | Watermain Replacement Program | Water Distribution | Water mains and distribution | $3M | 2026–2030 |
| 3 | Hickory and Walnut Street Rehabilitation | Sewer | Sewer rehabilitation and I&I | $3M | 2027–2028 |
| 4 | North Trunk Main Replacement Phase 1 | Sewer | Force mains and interceptors | $2M | 2028–2029 |
| 5 | North Trunk Main Replacement Phase 2 | Sewer | Force mains and interceptors | $2M | 2029–2030 |
| 6 | South Trunk Main Replacement Phase 3 | Sewer | Force mains and interceptors | $2M | 2027–2028 |
| 7 | Sanitary Sewer Lining Program | Sewer | Sewer rehabilitation and I&I | $2M | 2026–2030 |
| 8 | South Trunk Main Replacement Phase 2 | Sewer | Force mains and interceptors | $2M | 2027 |
| 9 | 1st Street and Betty Lane Rehabilitation | Water Distribution | Stormwater and flood resilience | $2M | 2029–2030 |
| 10 | Water Tower Maintenance | Water Supply | Storage tanks and reservoirs | $2M | 2029–2030 |
11 more line items in O Fallon, with descriptions and contacts
Klarifi holds every O Fallon line item with its description, the page it appears on and the source document, plus 23 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
$7M
5 items
2027
$15M
9 items
2028
$4M
3 items
2029
$6M
4 items
By department
| Department | Line items | Budget | Share |
|---|---|---|---|
| Sewer | 8 | $18M | 56% |
| Water Supply | 2 | $2M | 5% |
| Water Distribution | 11 | $13M | 39% |
Project types in O Fallon's plan
Wastewater treatment plants in O Fallon
3 publicly owned treatment plants in O Fallon with 3 permit violations in the last three years. Each profile shows flow, permit, technology and compliance data.
| Plant | Avg flow (MGD) | NPDES | Violations (3y) |
|---|---|---|---|
| O Fallon STP | 1.98 | IL0021636 | 0 |
| Caseyville Township East STP | 1.75 | ILL021083 | 3 |
| Caseyville Township West STP | 0.38 | IL0023043 | 0 |
Other Illinois cities with capital plans
O Fallon capital plan questions
Sources and methodology
Budgets and years are as published in O Fallon’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 (21 line items).
Data refreshed September 11, 2026.