An appeal ruling that a waste company owes $10.5 million in levies and penalties creates uncertainty about the liabilities of developers, according to environment lawyer Julius Skinner.
The federal government and four states have intervened in a High Court dispute between EPA Victoria and ResourceCo over the interstate transport of waste.
A WA parliamentary committee has condemned the performance of the state's environmental regulator and has called for greater public disclosure of detailed hazardous waste data.
A company that had its environmental licence revoked in 2014 due to contamination concerns has gained planning consent to carry out different activities on the same site.