The report, authored by Infrastructure Tasmania, is the first detailed modelling the state government has released on its proposed takeover of TasWater, since it was first announced in March.

“As one example, in the case of the Launceston Sewer Improvement Program, the estimated $270 million expenditure is scheduled to be completed in 2025-26 in TasWater’s original plan, with an average expenditure of $30 million per year,” the report reads.

“In the re-profiled program, this work is completed in 2022-23, resulting in average annual expenditure of $45 million per year. This would result in a higher level of employment in the Launceston area over this period, including from the impact on other industries, including local manufacturing.”

Launceston was identified as the only place in the state with the potential for “significant project overlap” because of the sewer improvement project and stormwater upgrades.

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TasWater chief executive Michael Brewster said the organisation maintained its position there was ‘no need to accelerate the program.’

“Our position all along has been it’s possible to accelerate the program but there is a price to pay for that, the price is significant additional debt and funding that has to come from other sectors,” he said.

“In our view there is no crisis so we see no justification for accelerating it.” Mr Brewster said TasWater was not sent a copy of the report and he personally had only obtained a copy at lunchtime on Wednesday.

He said the organisation would need some time to scrutinise the report but it was pleasing to see the government release the modelling.

City of Launceston general manager Robert Dobrzynski said the council would consider the report ‘in due course” while they await draft legislation on the proposal.

“It will be more appropriate to await full details of the proposal from the state government including the draft legislation and proposed improvement initiatives arising out of Tamar Estuary management taskforce to enable the council to undertake informed consideration,” Mr Dobrzynski  said.

“While we have not yet had an opportunity to examine the report in detail, there can be no doubt that improved water and sewerage outcomes would have positive impacts on the city, and lead to greater investment and employment.

“In particular, capital improvements that stop stormwater and sewage overflows into the river system during high rainfall events would improve the health and amenity of the city's river frontages and promote a more attractive waterfront offering to tourists.”