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CO alarms are required in all newly constructed one- and two-family dwellings and town homes not more than three stories.

Effective date: July 1998

CO alarms are required in existing apartments, hotels and other group occupancies, as well as in rented one- and two-family dwellings.

Effective date: September 2012

CO alarms are required in all new multi-dwelling units, hotels and other group occupancies.

Effective date: January 2013

CO alarms are required in all public and private schools within the state, as well as daycare centers (House Bill 4138). Alarms must be hardwired with battery backup

Effective date: January 2019

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