In this Dec. 28, 2021, file photo, a sign on a Portland shop window advises customers masks are required for entry. Credit: Troy R. Bennett / BDN

Bath city councilors voted Wednesday night to require masks to be worn indoors.

That makes the coastal city the fourth municipality in Maine to require people to wear masks indoors in an effort to contain the spreading coronavirus.

The ordinance, which passed unanimously, takes effect Monday, and will remain in place for at least 60 days or until virus transmission falls to a “moderate” level, as defined by the Maine Center for Disease Control and Prevention, according to ABC affiliate WMTW.

Under the ordinance, churches and houses of worship, schools and offices where workers can be easily isolated are exempt from the mandate, the newspaper reported.

Fines were struck from the ordinance, leaving businesses that violate it subject to “enforcement activities.”

Similar ordinances have been adopted in Portland, Brunswick and Freeport since the start of the year. South Portland city councilors will vote next week whether to mandate mask wearing indoors.

As the number of municipalities requiring masks to be worn indoors grows, others have balked at new mandates, including Belfast and Bangor.