- ABT, Inc.
- ACF West
- Advanced Drainage Systems
- AKS
- ALS USA Environmental Labs
- Amazon
- Amtrak
- American Peat Technology
- Apex Companies, LLC
- Apex Laboratories, LLC
- Aqualis
- Aquarius Environmental
- AquaShield Inc.
- Ash Grove Cement Company
- B&R Autowrecking
- Basalite Concrete Products
- Bedrock Natural Stone
- Beveridge & Diamond PC
- Blue Environmental
- Calbag Metals Co.
- Carson Energy Company, Inc.
- CatchAll Environmental
- Cedar Grove Composting
- Century West Engineering
- CitadelEHS
- City of Gresham
- City of Portland
- Clean Harbors Environmental Services
- Clean Water Services
- CleanWay Environmental Partners
- Clear Creek Systems
- Concrete Canvas
- Conser Design and Construction
- Contech Engineered Solutions
- COR Disposal & Recycling
- ECS Pacific
- EKI Environment & Water
- ENTEK International LLC
- Enpurion
- EnviroMet
- Environmental Business Solutions
- Environmental Works
- ERSM
- Eurofins Environment Testing Northwest
- Farallon Consulting LLC
- Ferguson Waterworks
- GeoEngineers
- Geosyntec Consultants
- Gullywasher Stormwater Filters
- Haley & Aldrich
- Headwater Technologies
- Hexion Inc.
- Hydro Extrusion Portland, Inc.
- Idaho Department of Environmental Quality
- Jordan Ramis
- Justin B Green Consulting
- Kennedy Jenks
- Kinder Morgan Terminals
- Landau Associates
- LOVETT
- Maul Foster & Alongi
- Metro
- Mountain West EHS
- Multnomah County Transportation Division
- Newterra
- North Clackamas Watersheds Council
- Oregon Department of Environmental Quality
- Oregon Department of Geology and Mineral Industries
- Oregon Department of Transportation
- Oregon State University
- Oregon Steel Mills LLC
- Oregon Tool
- Oregon-Canadian Forest Products
- Osborn Consulting
- Otak
- Pace Analytical
- Pacific Coast Carbon
- Pacific Stormwater
- Parametrix
- Perkins Coie LLP
- Port of Newport
- Port of Portland
- Portland General Electric
- Prinsco
- Portland Bureau of Environmental Services
- Precision Castparts Corporation
- Prinsco
- Rain for Rent
- Recology
- Riparia Environmental
- River City Environmental
- Rodda Paint
- Rogue Disposal & Recycling
- SCS Engineers
- Southport Forest Products
- Stoel Rives LLP
- Stormshield BMPS
- StormTank
- Stormwater BIOCHAR
- Terracon Consultants
- Terraphase Engineering Inc.
- Terwilliger Plaza Retirement Community
- Toyota Logistic Services
- U.S. Army Corps of Engineeers
- Waste Connections
- WaterTectonics
- Western Interlock
- Whitney Equipment Co.
- Wilcox + Flegel
- Wildwood Environmental
- Wilhelm Trucking Company
- WM
- Zip-O-Log Mills