Householders would be the big winners under a proposed shake-up of water bills that could save a typical residential customer more than $100 a year.
The Economic Regulation Authority will today release its final report into WA water tariffs, recommending sweeping changes to the way charges are calculated and passed on to household consumers.
ERA chairman Lyndon Rowe was tight-lipped about the report yesterday but it is understood the document will mostly be in line with the draft version released in September.
Under the draft, average water bills would fall 10.5 per cent, or $128 a year, because of an overhaul of wastewater charges.
The fees are currently based on the value of a property rather than the cost of servicing it.
The ERA wants a "single and equal fixed charge payable by all customers".
Its draft said the change would more than compensate customers for a modest 3.6 per cent, or $20, increase in water usage charges.
There are doubts about whether the Government will embrace the ERA report given a recommendation in the draft to slash Water Corporation's profitability would cost the State $1 billion.