Officials have warned The Range in Bridgend it could be closed for selling non-essential items.
Council workers gave an improvement notice to the homeware and garden retailer at Waterton Retail Park for selling non-essential items in store rather than via click and collect.
The Welsh Government website states businesses may operate a click and collect service for non-essential items regardless of whether their premises must be closed.
According to Bridgend County Borough Council officers from the Shared Regulatory Service (SRS) caught the store breaching Welsh Government guidelines on March 7 and gave staff 48 hours to comply.
Businesses are usually given 48 hours to comply with the terms of an improvement notice. Failure to comply can result in closure, a fixed penalty notice, or being taken to court.
A convenience store and mobile caterer were also given improvement notices for failing to comply with coronavirus regulations between March 6 and March 7.
Officials saw a member of staff at Meg's Chill and Grill in Cowbridge Road, Waterton, serving a customer with neither of them wearing a face mask, according to a council spokesman.
Officers served a notice to Londis in Tondu on March 6 because the shop did not provide hand sanitiser at the store entrance/exit. They also ordered the store to change the layout of the premises to enable social distancing.
A spokesman for the council said: "Under the current Covid-19 safety restrictions it is important that customers and staff in this type of setting wear face coverings and adhere to the two-metre social distancing requirement.”
The SRS, a partnership between South Wales Police and Bridgend, Cardiff and the Vale of Glamorgan councils, carries out checks on licensed premises to ensure they comply with government guidelines.
It has issued 85 improvement notices to businesses in Bridgend county borough and temporarily closed six for breaching Welsh Government coronavirus rules.
