ECOtas services clients from the public and private sector. The following are some of the past and present clients of ECOtas.
- AAD Nominees Pty Ltd
- Abetz Curtis Lawyers
- Accelerate Resources Limited
- Airlines of Tasmania Pty Ltd
- AKS Forest Services
- Andrew Walter Constructions Pty Ltd
- Artec Pty Ltd
- Aurecon Australia
- Aurora
- Aus Tin Mining
- Australian Bauxite Limited
- BCD Resources
- Beechworth Spraying Pty Ltd
- BHP Billiton (TEMCO)
- Birds Australia
- Boral Construction Materials Group Ltd
- Botanic Resources
- Break O’Day Council
- Brighton Council
- Bright Phase Resources Ltd
- Bullock Consulting
- Bunnings Group
- Catalyst
- Cement Australia
- Circular Head Council
- City of Clarence
- City of Hobart (Hobart City Council)
- City of Launceston
- Cradle Country Adventures
- Cradle Mountain Water
- Daly International
- Damon Jackson Design
- Decibel
- Department of Primary Industries, Parks, Water & Environment (Threatened Species Section)
- Department of Primary Industries, Parks, Water & Environment (Conservation Policy and Planning Branch)
- Department of Primary Industries, Parks, Water & Environment (Parks & Wildlife Service)
- Design Hub
- Direen Homes
- Dorset Council
- Duo Design
- East Coast Surveying Pty Ltd
- Eco-style Architecture
- Entura
- Forest Enterprises Australia
- Forest Practices Authority
- Forestry Tasmania
- Forico Pty Limited
- Fulton Hogan Construction Pty Ltd
- G7 Generation
- George Town Council
- GH D&D
- GHD
- Gifford & Associates
- Glenorchy City Council
- Gradco Pty Ltd
- Gunns Limited
- Gunns Plantations Limited
- H.B.M.I.
- Hobart International Airport
- Hydro Tasmania
- iFARM
- IMP Environmental Solutions
- Integrated Land Management and Planning
- Ireneinc Planning
- JAWS Architects
- Johnstone, McGee & Gandy
- Kassem Holdings Pty Ltd
- Kentish Council
- Kingborough Council
- King Harding Excavation and Seal
- Living Trails Australia
- LXN Architecture
- Maria Island Walk
- Meander Valley Council
- Millin Environmental Services
- Mitchell Plastics
- Norske Skog
- NRM Cradle Coast
- NRM North
- NRM South
- Oakdale Pistol Club (SSAA)
- PB Australia
- PDA Surveyors
- Pentarch Forestry
- Pitt & Sherry
- Playce
- Poco People
- Port Arthur Historic Sites Management Authority
- Prime Design
- PS Solutions
- Quoin Pastoral Company
- RACT
- Sailing Hillside Vineyard
- SEMF Pty Ltd (including the Forest Conservation Fund)
- Shaw Contracting
- Shree Minerals
- Simmons Wolfhagen
- Smartfibre
- Southern Water
- Spring Bay Wildcare
- Statewide Constructions
- State-wide Earthworks Pty Ltd
- Stornoway Quarrying
- Sumitomo Australia Ltd
- Sustainable Forest Management Pty Ltd (SFM)
- TAS Land and Forest
- Tasman Sea Salt
- Tasmania Fire Service
- Tasmanian Irrigation (TI)
- Tasmanian Irrigation Development Board (TIDB)
- Tasmanian Walking Company
- TasNetworks
- TasRail
- Tassal Group Ltd
- TasWater
- Telstra
- Terroir Pty Ltd
- Threatened Plants Tasmania (WildCare)
- Timberlink Australia
- Town and Country Planning Pty Ltd
- Turnpoint Group
- UDI
- Unity Mining Limited
- Universal Communications Group
- University of Tasmania
- VEC
- Venture Minerals
- Visionstream
- Wilson Homes
- Woolcott Surveys
- Xquared Architects Pty Ltd
- Zeehan Zinc
- Various private land owners and managers (Statewide)