Aeration and blowers projects in US capital improvement plans
204 planned projects · $2.8B · 132 cities in 31 states
Secondary treatment capacity and efficiency: blowers, diffusers, aeration basins, oxidation ditches, sequencing batch reactors and other biological process upgrades. Aeration is typically the largest energy cost at a plant.
Klarifi's extraction of published capital improvement plans finds 204 aeration projects in 132 cities with a combined planning budget of $2.8B, the largest being Sand Island Wastewater Treatment Plant Secondary Treatment in Honolulu, HI at $2.0B. The list below ranks the 25 largest by budget; every city links to its full capital plan page.
The largest aeration projects
| # | Project | City | Budget | Years |
|---|---|---|---|---|
| 1 | Sand Island Wastewater Treatment Plant Secondary Treatment | Honolulu, HI | $2.0B | 2025–2031 |
| 2 | CBWTP Secondary Treatment Expansion Program | Portland, OR | $84M | 2025–2027 |
| 3 | Membrane Bioreactor Plant | Creswell, OR | $65M | 2026–2029 |
| 4 | Secondary Treatment System Upgrades | Windsor, CA | $57M | 2023–2027 |
| 5 | NG - TSWRRF Growth Capacity Improvements | Lincoln, NE | $56M | 2025 |
| 6 | CBWTP Blower System/Building Improvements | Portland, OR | $50M | 2025–2030 |
| 7 | Jackson Pike WWTP Aeration Optimization | Columbus, OH | $48M | 2025–2027 |
| 8 | 23rd Avenue Wastewater Treatment Plant Process Blower Replacement | Phoenix, AZ | $46M | 2024–2029 |
| 9 | Arlington East Reclamation Facility Upgrades - Aeration Basin and Blowers | Jacksonville, FL | $41M | 2024–2028 |
| 10 | SWWTP Aeration Optimization | Columbus, OH | $37M | 2026–2028 |
| 11 | Jackson Pike WWTP Aeration Optimization Phase 2 | Columbus, OH | $31M | 2026–2028 |
| 12 | NE-WWTP Secondary Treatment Improvement Project | Baytown, TX | $17M | 2027–2028 |
| 13 | Buckman Reclamation Facility - Aeration Basin Air Header and Diffuser Replacement | Jacksonville, FL | $17M | 2024–2028 |
| 14 | SEWWTP Upgrade - 6 MGD to 9 MGD (Oxidation Ditch Ring & Final Clarifier Addition) | Carbondale, IL | $15M | 2026 |
| 15 | Primary Treatment and Digestor Blower Improvements CWWTP | Fort Myers, FL | $14M | 2025 |
| 16 | Primary Treatment and Digestor Blower Improvements SWWTP | Fort Myers, FL | $13M | 2026 |
| 17 | MWWTP Treatment Upgrades - SBR Tank Rehab/Full Floor Aeration | Juneau, AK | $10M | 2027–2029 |
| 18 | Honouliuli Wastewater Treatment Plant Secondary Treatment | Honolulu, HI | $10M | 2025 |
| 19 | Public Works Multi-Use Facility | Omaha, NE | $10M | 2025 |
| 20 | SWWTP Aeration Optimization - Part 2 | Columbus, OH | $8M | 2028–2029 |
| 21 | Aeration System Upgrades | Plattsburgh, NY | $8M | 2027 |
| 22 | BDCWWTF R&R Aeration Basins & Headworks | Westminster, CO | $8M | 2028–2029 |
| 23 | Blower Replacement | St Joseph, MO | $7M | 2025–2026 |
| 24 | Improve Wastewater Treatment Plant Aeration System | Fairfield, OH | $7M | 2023–2027 |
| 25 | Neely Oxidation Ditch Rotor Repl | Gilbert, AZ | $7M | 2025 |
All 204 aeration 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 aeration projects
| City | Projects | Budget |
|---|---|---|
| Juneau, AK | 5 | $14M |
| Columbus, OH | 4 | $124M |
| Puyallup, WA | 4 | $1M |
| Cadillac, MI | 4 | $608K |
| Clare, MI | 4 | $205K |
| Antioch, IL | 4 | $190K |
| Wixom, MI | 4 | $140K |
| Kittery, ME | 4 | $103K |
| Saint Petersburg, FL | 3 | $5M |
| Webster, MA | 3 | $5M |
| Hanover, NH | 3 | $5M |
| Salem, OR | 3 | $3M |
States with the most aeration projects
| State | Projects | Budget |
|---|---|---|
| Michigan | 47 | $18M |
| California | 12 | $68M |
| Illinois | 12 | $16M |
| Iowa | 12 | $3M |
| Florida | 11 | $93M |
| Ohio | 10 | $131M |
| Washington | 10 | $15M |
| Oregon | 8 | $202M |
| Colorado | 8 | $10M |
| Alaska | 6 | $14M |
| New York | 6 | $10M |
| Missouri | 6 | $9M |
Planned spend by start year
Before 2026
$2.5B
74 items
2026
$196M
54 items
2027
$52M
25 items
2028
$21M
17 items
2029
$11M
12 items
2030
$4M
10 items
2031
$4M
2 items
2032 and later
$5M
9 items
Unscheduled
$110K
1 items
Other project types
Aeration and blowers 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.