Experts have warned of looming health risks from the decommissioned Port Augusta power station.

Heavy storm activity has broken the crust off dust-suppressant chemicals sprayed onto ash at the site of the former power station in South Australia.

This has allowed a thick haze of ash to break free and blanket the rural city of Port Augusta.

The Environment Protection Authority (EPA) says there are not enough toxins in the dust to cause health concerns, but warned that separate to the toxicity, breathing in fine dust is harmful.

SA Manufacturing Minister Kyam Maher has announced the Government will pay for any residents to see a doctor if they needed, and will call on Flinders Power, the company responsible for managing the site, to pay it back.

Former chief chemist at Adelaide Brighton Cement, Ian Dyson, which once used fly-ash says risk to residents is being downplayed.

He wants more tests carried out.

“It doesn't take very long to do the analysis, only a matter of days, and I think the fears of the Port Augusta residents are well founded,” Dyson said.

The EPA has ordered Flinders Power to conduct more frequent tests on the dust, including monitoring toxicity.

“We have investigations under way into what is in the ash dam, historical analysis of the chemicals that might be deeper in the ash dam,” EPA chief executive officer Tony Ciccaelli said.

SA Minister Kyam Maher said he had spoken with Flinders Power.

“They know they need to take into account extreme weather events and make sure that dust is suppressed,” he said.

“They have said they will make sure over the next couple of weeks they have it resealed.”