Odor and corrosion control projects in US capital improvement plans
58 planned projects · $249M · 42 cities in 20 states
Covers, scrubbers, biofilters and chemical dosing that stop hydrogen sulfide and odor at headworks, sludge handling and collection systems, plus the corrosion damage it causes.
Klarifi's extraction of published capital improvement plans finds 58 odor control projects in 42 cities with a combined planning budget of $249M, the largest being Greenwood WWTP Process Upgrade (DAF & Odor Control) in Corpus Christi, TX at $58M. The list below ranks the 25 largest by budget; every city links to its full capital plan page.
The largest odor control projects
| # | Project | City | Budget | Years |
|---|---|---|---|---|
| 1 | Greenwood WWTP Process Upgrade (DAF & Odor Control) | Corpus Christi, TX | $58M | 2025–2026 |
| 2 | Compost Odor Control Improvements - Phase 3 | Columbus, OH | $26M | 2026–2028 |
| 3 | Compost Facility Odor Reduction Improvements - Part 2 | Columbus, OH | $23M | 2025 |
| 4 | SLRWRF Major Improvements | Oceanside, CA | $22M | 2024–2029 |
| 5 | Odor Control Citywide | Phoenix, AZ | $20M | 2024–2029 |
| 6 | 2026 - 2030 Odor Control Program | Topeka, KS | $14M | 2025–2031 |
| 7 | SWWTP Biofilter Cold Weather Reliability Improvements | Columbus, OH | $11M | 2025 |
| 8 | Salt River Outfall/Southern Avenue Interceptor Odor Control Implementation | Phoenix, AZ | $11M | 2024–2028 |
| 9 | Treatment Plant Odor Control Management | Lexington, KY | $8M | 2027–2031 |
| 10 | Odor Control Improvements - City Wide (N/A) | Oklahoma City, OK | $5M | 2026 |
| 11 | WWTP Plants 3 & 4 Odor Control Rehab | Wichita, KS | $3M | 2030 |
| 12 | Agritopia Odor Control Site | Gilbert, AZ | $3M | 2027 |
| 13 | SASC Odor Control Site | Gilbert, AZ | $3M | 2026 |
| 14 | BioFilter - Lindsay and Queen Creek | Gilbert, AZ | $3M | 2030–2034 |
| 15 | Odor and Corrosion Control | Raleigh, NC | $3M | 2024–2029 |
| 16 | Odor Control Upgrade SWWTP | Fort Myers, FL | $3M | 2025 |
| 17 | WRE - MPS-401 Relocation | Cape Coral, FL | $2M | 2025–2026 |
| 18 | Odor Control Station Replacements | Mesa, AZ | $2M | 2023–2027 |
| 19 | 39th Avenue Interceptor Odor Control | Phoenix, AZ | $2M | 2024–2027 |
| 20 | Westside Odor Control Improvements | Vancouver, WA | $2M | 2025–2027 |
| 21 | WRE - MPS-103 Relocation | Cape Coral, FL | $2M | 2025 |
| 22 | Large Line Rehabilitation from Hydrogen Sulfide Damage | Spokane, WA | $2M | 2026–2030 |
| 23 | Val Vista and Ocotillo Odor Control | Gilbert, AZ | $2M | 2030–2034 |
| 24 | BioFilter - Greenfield and Germann | Gilbert, AZ | $2M | 2030–2034 |
| 25 | Lindsay and Pecos Odor Control | Gilbert, AZ | $2M | 2030–2034 |
All 58 odor control 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 odor control projects
| City | Projects | Budget |
|---|---|---|
| Gilbert, AZ | 8 | $16M |
| Columbus, OH | 3 | $61M |
| Phoenix, AZ | 3 | $33M |
| Cape Coral, FL | 2 | $4M |
| Spokane, WA | 2 | $2M |
| Canton, GA | 2 | $630K |
| Longview, WA | 2 | $400K |
| Texarkana, TX | 2 | $64K |
| Corpus Christi, TX | 1 | $58M |
| Oceanside, CA | 1 | $22M |
| Topeka, KS | 1 | $14M |
| Lexington, KY | 1 | $8M |
States with the most odor control projects
| State | Projects | Budget |
|---|---|---|
| Arizona | 13 | $51M |
| Washington | 6 | $5M |
| California | 5 | $25M |
| Florida | 5 | $9M |
| Ohio | 4 | $61M |
| Texas | 3 | $58M |
| Georgia | 3 | $692K |
| Kansas | 2 | $17M |
| North Carolina | 2 | $3M |
| Virginia | 2 | $1M |
| Missouri | 2 | $1M |
| Louisiana | 2 | $900K |
Planned spend by start year
Before 2026
$184M
29 items
2026
$42M
16 items
2027
$12M
7 items
2028
$1M
1 items
2030
$11M
5 items
Other project types
Odor and corrosion control project 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.