St Helens Council officers are promising to ensure supermarkets introduce the charge for carrier bags about to be rolled out.
Trading Standards says it will be monitoring large retailers closely to ensure the 5p charge for single-use plastic bags is implemented.
Anyone who employs more than 250 people full time will have to charge for carrier bags from Monday October 5.
After deducting a certain amount for reasonable costs, retailers must also donate all proceeds to good causes.
St Helens Council cabinet member for green, smart and sustainable borough Coun Seve Gomez-Aspron said: “In 2013 over seven billion carrier bags were given out by the seven major supermarkets in England, which equates to 133 bags for every person.
“Many of those ended up littering the streets or entering water courses and causing harm to wildlife.”
Similar laws introduced in Wales in 2011 have led to a 70 per cent reduction in plastic bag waste and raised over £22m for charities and good causes.