Carbon Monoxide Alarms


Carbon Monoxide and
Carbon Monoxide Alarms



All residential structures in the state of Wisconsin are required to have working Carbon Monoxide (CO) Alarms

As of February 1, 2011 every residential structure in Wisconsin (new and existing) is required to be compliant with Administrative Codes SPS 321 and 328 of Wisconsin State Law.  This law requires single family, duplexes and multifamily units (apartments/condos) to install and maintain working Carbon Monoxide Alarms.

Click HERE for a guide on placement of Detectors

What are Wisconsin Carbon Monoxide Alarm Requirements?

Multifamily Residential Structures:

Apartments or Condos where 3 or more units share a roofline are considered “commercial” properties and receive regular fire inspections.  Those structures are also required to have operational CO alarms. Our fire inspectors work closely with the owners of these properties to ensure compliance. 

If you are an apartment owner or manager and you are unsure if your building is compliant, please contact one of our fire inspectors and they will gladly assist you.

Mark Mlekush, Fire Inspector:  mmlekush@cityofsunprairie.com  or (608) 837 5066

Single and 2 Family Homes:

·         IF the structure has any of the following, a Carbon Monoxide Alarm is required on each level of the structure. 

o   Any fuel burning appliance (stoves, ovens, clothes dryers)

o   Any fuel burning heater, furnace, boiler, water heater or fireplace (Gas,wood or Pellet)

o   An attached garage or parking area

·         Placement of the CO Alarms: A minimum of (1) per level of the home

o   Alarms shall be near sleeping areas where possible

·         New Construction must have CO Alarms that are hard-wired and have a battery back-up

·         Installed Alarms must bear the listing of an independent testing lab (i.e. UL, ETL, FM)

·         IF the structure does not have ANY fuel fired appliances, then a CO Alarm is not required

·         CO Alarm are not required in the following areas:

o   Unfinished Attic

o   Garage

o   Attached or detached storage areas

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If you have further questions on Carbon Monoxide, Carbon Monoxide Alarms or the state requirements please contact one of our fire inspectors:

Mark Mlekush, Fire Marshal:  mmlekush@cityofsunprairie.com  or (608) 837 5066