Environment Protection Agency spokeswoman Narelle Sargent said inspectors visited 25 food businesses in Belconnen, Hawker, O’Connor, Manuka, Kingston, Civic, Braddon and Dickson as part of the recent Operation Scrap audit, which looked at cleaning practices, kitchen maintenance, cleaning facilities and pollution.

“Unfortunately, officers found evidence of kitchen waste in the stormwater sumps at the rear of three businesses,” Mrs Sargent said.

“These businesses were provided with information about keeping the environment around their premises clean and were verbally warned to stop putting waste down the stormwater system.

"We expect to see improvements next time we visit, or further regulatory activity will be taken.”

On-the-spot-fines of up to $200 for individuals or $1000 for businesses can apply for acts of stormwater pollution.

“What people and businesses need to remember is that stormwater feeds directly into our creeks, lakes and rivers without treatment,” Mrs Sargent said.

"Therefore, what you put in it ends up in our water systems."

Mrs Sargent said waterways were polluted when contaminants like waste matter, detergents and chemicals were put into the stormwater system, resulting in dead fish, algae overgrowth, unsafe swimming conditions, and smelly, unsightly waterways.

Health Protection Services executive director Conrad Barr said inspectors also found minor maintenance issues at three businesses during Operation Scrap, including full cooking oil waste bins and an area of floor that needed resealing.

“The items identified in the inspection reports will be followed up with the businesses concerned as part of normal business,” Mr Barr said.

The next food audit will take place later in 2018.

Stormwater pollution can be reported to the Environment Protection Authority on 13 22 81.

Businesses wanting more information about food safety standards can call Health Protection Services on 6205 1700 or visit the ACT Health website.