A new practise has been put in place by the City of Launceston council after it was caught disposing of water from its mini sweeper into a stream that flows into the North Esk.
A member of the public raised the concern with the council after witnessing the mini sweeper disposing of its waste at the Henry Street Bridge near Kmart.
City of Launceston council general manager Michael Stretton said the matter had been investigated, with the belief the operators were "acting in good faith" in disposing what they "understood to be non-contaminated stormwater".
"We've reviewed the practice with them, determined this kind of disposal is not appropriate, and have initiated new practices," he said.
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The council did not answer questions relating to the new practices.
"The council investigated the complaint when it was raised with us," Mr Stretton said.
"This was stormwater collected off nearby streets and gutters by the mini sweeper, and its disposal in this manner was an isolated incident."
The council said it had existing dedicated disposal points, which it would continue to utilise in the future.
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