Macquarie Hospital in the city’s north, Tresillian family care centre at Wollstonecraft and Manly Adolescent and Young Adult Hospice are awaiting results from precautionary tests.

Samples taken from Mount Annan Christian College at Currans Hill and Trinity Catholic Primary School at Kemps Creek in southwest Sydney have returned negative results.

There are five schools affected, with one taking the decision to close for the week and another shut while students learn at a nearby site.

Two other schools at Oran Park in Sydney’s west are awaiting results of precautionary tests after mulch donated by a developer to the nearby St Mary Mackillop Catholic Parish was found to contain asbestos.

Premier Chris Minns defended the establishment of an expert taskforce to assist the state’s Environment Protection Authority (EPA) with identifying the spread of the contaminated mulch.

He said a multi-agency response was appropriate given the scale of the issue.

“(The EPA) were making progress in identifying the sites, but there were three, perhaps even more, sub-contractors that had the quantum of mulch and then sold it on to third parties,” he told a budget estimates hearing on Wednesday.

“As a result of that, it was a complex contact-tracing endeavour and it wasn’t an easy thing (for one agency) to do.”

The majority of the mulch the EPA was concerned about has now been tracked down and tested, chief executive Tony Chappel said on Tuesday.

“There are a number of other cash-sale type scenarios that we are just working through now, but it’s a handful of private residences that have been impacted,” he said.

A total of 47 sites have been confirmed impacted while 798 tests have come back negative since bonded asbestos was detected in recycled mulch at the Rozelle Parklands in Sydney’s inner west in January.

Sydney’s asbestos-mulch issue has also spread to Canberra with the potentially contaminated product sold for 11 months in the capital.

The ACT’s workplace safety watchdog is conducting further testing after bonded asbestos was confirmed in samples, however WorkSafe ACT commissioner Jacqueline Agius said there was no immediate major health risk.

“We are currently working with involved businesses to identify and inform anyone who may be impacted,” Agius said on Tuesday.