Stormwater and flood resilience projects in US capital improvement plans
245 planned projects · $2.8B · 90 cities in 33 states
In short
How many stormwater projects are in US city capital plans?
Klarifi’s extraction of published capital improvement plans finds 245 stormwater projects in 90 cities across 33 states, with a combined budget of $2.8B. The largest is Shared Cost Projects in Seattle, WA, at $176M.
Storm sewers, drainage and detention, combined sewer overflow controls, green infrastructure and flood resilience work. The list below ranks the 10 largest by budget; every city links to its full capital plan page.
The largest stormwater projects
| # | Project | City | Budget | Years |
|---|---|---|---|---|
| 1 | Shared Cost Projects | Seattle, WA | $176M | 2025–2026 |
| 2 | Future CSO Projects | Seattle, WA | $176M | 2025–2030 |
| 3 | Most Phase 3 Stormwater Projects | Atlanta, GA | $157M | 2026–2030 |
| 4 | GSI for Protection of Beneficial Uses | Seattle, WA | $125M | 2025–2030 |
| 5 | Vic Trace Reservoir Replacement and Resiliency Project | Santa Barbara, CA | $125M | 2025–2030 |
| 6 | Sediment Remediation | Seattle, WA | $117M | 2025–2030 |
| 7 | Southerly Stormwater and Floodplain Improvements | Columbus, OH | $109M | 2027 |
| 8 | Beneficial Uses Program | Seattle, WA | $97M | 2025–2030 |
| 9 | Finished Water Reliability & Interconnections | Arlington, VA | $95M | 2025–2031 |
| 10 | CSO Control Implementation | Omaha, NE | $92M | 2034 |
All 245 stormwater projects, with descriptions and contacts
Every line item with its description, page reference and source document, filterable by state, budget and start year, linked to the treatment plants and decision-makers in each city, and refreshed as new plans are adopted.
Cities with the most stormwater projects
| City | Projects | Budget |
|---|---|---|
| Spokane, WA | 23 | $58M |
| Seattle, WA | 17 | $1.1B |
| Denver, CO | 13 | $50M |
| Geismar, LA | 10 | $72M |
| Federal Way, WA | 9 | $26M |
| Nashville, TN | 8 | $303M |
| Portage, MI | 7 | $7M |
| Newport, RI | 6 | $18M |
| Columbus, OH | 5 | $124M |
| Columbus, GA | 5 | $15M |
| Des Moines, WA | 5 | $2M |
| Big Rapids, MI | 5 | $212K |
States with the most stormwater projects
| State | Projects | Budget |
|---|---|---|
| Washington | 55 | $1.2B |
| Michigan | 28 | $23M |
| Colorado | 20 | $65M |
| California | 13 | $181M |
| Oregon | 12 | $26M |
| Louisiana | 11 | $72M |
| Georgia | 10 | $181M |
| Florida | 10 | $25M |
| Tennessee | 8 | $303M |
| Ohio | 8 | $124M |
| Rhode Island | 7 | $19M |
| Illinois | 7 | $6M |
Planned spend by start year
Before 2026
$2.1B
156 items
2026
$239M
35 items
2027
$205M
17 items
2028
$112M
13 items
2029
$11M
9 items
2030
$18M
11 items
2031
$460K
1 items
2032 and later
$155M
3 items
Other project types
Questions about stormwater projects
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 October 12, 2026.
Wastewater terms: Lift station · Inflow and infiltration · Sludge dewatering · WWTP · POTW · MGD · all terms