In April 2018, Maryland legislation went into effect requiring rental units to have carbon monoxide alarms installed on every level of the unit,
including the basement.
The law applies to dwellings that contain one or more of the following: fuel-burning equipment, an attached garage and wood-burning
fireplaces or pellet stoves.
The CO alarms must be installed in one of the following ways:
•Hardwired into an alternating current power line with secondary battery backup;
•Battery-powered, sealed, tamper-resistant and using a battery with a life of at least 10 years;
•Through a security system, i.e., connected to an on-site control unit that monitors the CO alarm remotely and alerts a responsible party
when the device sounds an alarm; or,
•Combined with a hard-wired smoke alarm, if the combined device complies with Underwriters Laboratories (UL) and American National
Standards Institute (ANSI) standards.
The law also requires owners to provide written information on alarm testing and maintenance to at least one adult occupant of the unit, to
maintain records of notification, and to install alarms for hearing-impaired residents if a hearing-impaired person lives in the unit. More
information can be found at the following hyperlink:
MD Landlord Requirements for CO Monitors in Rental Properties Link