A Mackay Regional Council report has revealed more than a million litres of contaminated water had to be removed from a local waterway after a north Queensland industrial fire.

In November last year, the Greenfields blaze at North Mackay destroyed three businesses and millions of dollars worth of stock.

Mackay Regional Council's engineering services report says run-off during firefighting efforts entered a nearby waterway.

The director of engineering services, Stuart Holley, says 50 truckloads of contaminated water had to be pumped out of a nearby dam after one of the drainage systems was deemed an unacceptable environmental risk.

"We arranged for that material to be trucked to another site near Mount Bassett which was an old sewerage treatment site," he said.

Mr Holley says the council worked with the Department of Environment and Heritage Protection to ensure all protocols were met.

"Then we irrigated that onto the land that was already contaminated at that location."