The wearing of face coverings in retail settings becomes mandatory from today.
Anyone who refuses to wear one will face fines of up to 2,500 euro and time in prison.
The rule will not apply to children under 13 or anyone who can't wear one due to physical or mental incapacity.
Retail staff will be required to wear one unless there's a partition or space of two metres between them and customers.
Chair of Waterford Business Group Michael Garland says people in Waterford are already used to wearing face-masks in shops and those not wearing masks feel out of place.
He says shops in the city will not be putting extra security at their doors to enforce the rule as most people are compliant.