Colorado Code § 38-45-104

Carbon monoxide alarms in rental properties
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(1) Except as provided in
subsection (5) of this section, any single-family dwelling or dwelling unit in a multi-family
dwelling used for rental purposes and that includes fuel-fired appliances or an attached garage
where, on or after July 1, 2009, interior alterations, repairs, fuel-fired appliance replacements, or
additions, any of which requires a building permit, occurs or where one or more rooms lawfully
used for sleeping purposes are added shall be subject to the requirements specified in sections
38-45-102 and 38-45-103.
(2) Except as provided in subsection (5) of this section, each existing single-family
dwelling or existing dwelling unit in a multi-family dwelling that is used for rental purposes that
has a change in tenant occupancy on or after July 1, 2009, shall be subject to the requirements
specified in sections 38-45-102 and 38-45-103.
(3) (a) Notwithstanding any other provision of law, the owner of any rental property
specified in subsections (1) and (2) of this section shall:
(I) Prior to the commencement of a new tenant occupancy, replace any carbon monoxide
alarm that was stolen, removed, found missing, or found not operational after the previous
occupancy;
(II) Ensure that any batteries necessary to make the carbon monoxide alarm operational
are provided to the tenant at the time the tenant takes residence in the dwelling unit;
(III) Replace any carbon monoxide alarm if notified by a tenant as specified in paragraph
(c) of subsection (4) of this section that any carbon monoxide alarm was stolen, removed, found
missing, or found not operational during the tenant's occupancy; and
(IV) Fix any deficiency in a carbon monoxide alarm if notified by a tenant as specified
in paragraph (d) of subsection (4) of this section.
(b) Except as provided in paragraph (a) of this subsection (3), the owner of a single-
family dwelling or dwelling unit in a multi-family dwelling that is used for rental purposes is not
responsible for the maintenance, repair, or replacement of a carbon monoxide alarm or the care
and replacement of batteries for such an alarm.
(4) Notwithstanding any other provision of law, the tenant of any rental property
specified in subsections (1) and (2) of this section shall:
(a) Keep, test, and maintain all carbon monoxide alarms in good repair;
(b) Notify, in writing, the owner of the single-family dwelling or dwelling unit of a
multi-family dwelling, or the owner's authorized agent, if the batteries of any carbon monoxide
alarm need to be replaced;
(c) Notify, in writing, the owner of the single-family dwelling or dwelling unit of a
multi-family dwelling, or the owner's authorized agent, if any carbon monoxide alarm is stolen,
removed, found missing, or found not operational during the tenant's occupancy of the single-
family dwelling or dwelling unit in the multi-family dwelling; and
(d) Notify, in writing, the owner of the single-family dwelling or dwelling unit of a
multi-family dwelling, or the owner's authorized agent, of any deficiency in any carbon
monoxide alarm that the tenant cannot correct.
(5) Notwithstanding the requirements of section 38-45-103 (1) and (2), so long as there
is a centralized alarm system or other mechanism for a responsible person to hear the alarm at all
times in a multi-family dwelling used for rental purposes, such multi-family dwelling may have
an operational carbon monoxide alarm installed within twenty-five feet of any fuel-fired heater
or appliance, fireplace, or garage or in a location as specified in any building code adopted by
the state or any local government entity.
(6) No person shall remove batteries from, or in any way render inoperable, a carbon
monoxide alarm, except as part of a process to inspect, maintain, repair, or replace the alarm or
replace the batteries in the alarm.

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