The sale of the publicly-owned Water Corp's construction and engineering unit is a dud deal for taxpayers that comes when its business is projected to rise, the WA opposition says.

The government is selling the division to engineers RCR Tomlinson for $10.4 million but has admitted it will only make an after-tax profit of about $2 million after paying redundancies and consultants’ fees. RCR Tomlinson highlighted $130 million in guaranteed work over three years when it announced the deal last…