Membrane and filtration projects in US capital improvement plans
320 planned projects · $3.8B · 175 cities in 29 states
In short
How many filtration projects are in US city capital plans?
Klarifi’s extraction of published capital improvement plans finds 320 filtration projects in 175 cities across 29 states, with a combined budget of $3.8B. The largest is Bull Run Filtration in Portland, OR, at $1.0B.
Sand, cloth and membrane filters at water and wastewater plants, membrane bioreactors, and activated carbon or ion exchange for contaminants. The list below ranks the 10 largest by budget; every city links to its full capital plan page. What is tertiary treatment? →
The largest filtration projects
| # | Project | City | Budget | Years |
|---|---|---|---|---|
| 1 | Bull Run Filtration | Portland, OR | $1.0B | 2025–2029 |
| 2 | Bull Run Filtration | Portland, OR | $634M | 2024–2027 |
| 3 | JWPP - Filter Underdrain Replacement | Chicago, IL | $306M | 2028–2035 |
| 4 | Buffalo Creek Reverse Osmosis Water Treatment Plant | Myakka City, FL | $174M | 2025–2031 |
| 5 | DRWP GAC Improvements | Columbus, OH | $154M | 2025–2028 |
| 6 | Membrane Softening Plant | Delray Beach, FL | $113M | 2024–2027 |
| 7 | SWPP - Filter Underdrain Replacement | Chicago, IL | $111M | 2026–2028 |
| 8 | Emerging Contaminants | Pompano Beach, FL | $73M | 2025–2029 |
| 9 | NRO RO WTP Wellfield Expansion Phase II | Cape Coral, FL | $54M | 2025–2028 |
| 10 | Ashburton Water Filtration Plant - Filter Replacement | Baltimore, MD | $50M | 2028 |
All 320 filtration 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 filtration projects
| City | Projects | Budget |
|---|---|---|
| Baltimore, MD | 17 | $363M |
| Myakka City, FL | 9 | $203M |
| Saint Petersburg, FL | 8 | $41M |
| Chelsea, MI | 8 | $564K |
| Portland, OR | 5 | $1.7B |
| Cape Coral, FL | 5 | $132M |
| Raleigh, NC | 5 | $75M |
| Owosso, MI | 5 | $3M |
| Aberdeen, SD | 5 | $2M |
| Chicago, IL | 4 | $431M |
| Columbus, OH | 4 | $160M |
| Orlando, FL | 4 | $30M |
States with the most filtration projects
| State | Projects | Budget |
|---|---|---|
| Michigan | 67 | $98M |
| Florida | 43 | $633M |
| Maryland | 25 | $377M |
| California | 20 | $45M |
| Oregon | 16 | $1.7B |
| Minnesota | 15 | $32M |
| Washington | 13 | $41M |
| Ohio | 11 | $171M |
| North Carolina | 10 | $79M |
| Illinois | 9 | $446M |
| Colorado | 9 | $15M |
| Iowa | 9 | $3M |
Planned spend by start year
Before 2026
$2.8B
163 items
2026
$278M
60 items
2027
$77M
33 items
2028
$467M
27 items
2029
$85M
21 items
2030
$107M
10 items
2031
$5M
3 items
2032 and later
$615K
3 items
Other project types
Questions about filtration 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 · Significant industrial user · Biosolids · all terms