- AGR Matthey Pty Ltd
- Alcoa of Australia Ltd
- Astron Environmental
- ATSIC/Ove Arup & Partners
- Australian National Railways
- Barrick Goldmines
- BHP Billiton Iron Ore Pty Ltd
- Calcott & Downey Pty Ltd
- Chevron
- City of Fremantle
- Coogee Chemicals Pty Ltd
- Department of Defence
- Department of Environment
- Department of Housing and Works
- Department of Water
- Geopeko
- Global Olivine WA
- Gwalia Consolidated
- HLA-ENSR Pty Ltd
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- Kellerberrin Shire
- LandCorp
- Monarch Gold Mining
- Myrup Fly-in Estate
- Nufarm Coogee Pty Ltd.
- Nufarm Limited
- Ok Tedi Mines Ltd
- Pilbara Iron
- Plutonic Goldmine
- Resolute Samantha Goldmines
- Shell Australia, Ampol, Caltex, Wesco Fuels
- Tiwest Joint Venture
- Water Corporation
- Wesfarmers CSBP Limited
- Wesfarmers Kleenheat Gas Pty Ltd
- West Australian Municipal Association
- Westralia Airports Corporation
- WMC Resources Pty Ltd
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