Retailers in Western Australia could be hit with fines of up to $5,000 if they supply lightweight plastic bags to customers in 2019.
Single-use plastic bags were banned in WA in July but fines have not been enforced.
Under the new legislation, shops providing customers with the banned bags will face potential prosecution from January 1, 2019.
Plastic bag suppliers and manufacturers who provide misleading information when selling bags to retailers also risk being prosecuted and fined.
The state-wide ban includes all lightweight bags made of plastic, including bags that are biodegradable, degradable or compostable - with handles and a thickness of 35 microns or less, and applies to all retailers.
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Environment Minister Stephen Dawson said the ban has been well supported by the community.
"I commend those who have backed the Government's initiative and got on board - using alternatives to plastic bags,” he said.
"From January 1, 2019 it will be an offence for retailers to supply lightweight plastic bags - this includes small retail shops, takeaway food outlets and markets.
"Taking lightweight plastic bags out of the litter stream is a significant step towards protecting our environment."
The state government will be relying on shoppers to dob in retailers who break the rules.
Complaints can be lodged with the National Retail Association at www.bagbanwa.com.au.
They are also reminding consumers to continue taking their own reusable bags to the shops with them.
