Does Arizona Require CO Detectors? Sober Living and Local Rules

Last verified: August 24, 2026

Anyone searching Arizona carbon monoxide detector laws will meet two statute numbers that do not say what the guides citing them claim. ARS 36-601 and ARS 36-1451 both circulate as Arizona's residential carbon monoxide requirement. ARS 36-601 is the public nuisances chapter of the public health title and says nothing about detectors. ARS 36-1451 returns nothing at all, because Title 36's 1400s are the public housing authority article. Neither supports the claim, and a reader who arrived holding one of those numbers can stop looking for it. Arizona is the only state on this site where two separate circulating citations both fail, and the reason they circulate is worth knowing: both are real sections of Title 36, so a search returns a page and the page is about something else.

What Arizona has instead is narrower and quicker to state. The statewide duties attach to licensed settings rather than to housing in general: sober living homes under ARS 36-2062 with A.A.C. R9-12-206, and transitional housing under ARS 36-4202. There is no broad statewide mandate for ordinary homes or rentals. ARS Title 33 Chapter 10, the Residential Landlord and Tenant Act, imposes no carbon monoxide duty either; its habitability section at 33-1324 requires the landlord to comply with applicable building codes materially affecting health and safety and names no alarm of any kind.

So for ordinary housing the requirement is municipal, and the section number moves with the edition. Phoenix, Tucson, Scottsdale, Mesa and Tempe each adopt the International Residential Code for new residential construction on their own schedule. Through the 2021 edition the alarm rule sits at Section R315; the 2024 edition renumbered it to Section R311 and reassigned R315 to sleeping lofts. Mesa and Tempe were read directly on 2026-08-11 and both print the rule at R311.6 under headings naming the 2024 edition. Confirm the adopted edition with the building department before relying on any section number, because neighbouring cities differ, and expect a different answer for a hotel, which takes the statewide fire code instead.

Key Takeaways

CO detector requirements for Arizona
Applies to homes?	No
Applies to rentals?	No
Applies to hotels/STRs?	Yes
Applies to schools?	Yes, under a condition
Applies to workplaces?	Yes, under a condition

Schools and workplaces

Schools: it depends, and the test is one you can apply to the building itself. Arizona incorporates the whole fire code and binds anyone doing business in the state to it, so a school is inside the scheme new or old, and since 13 April 2026 the edition it is inside has stopped working from an occupancy list. Ariz. Admin. Code R4-36-201 provides that any person residing, doing business or physically present in Arizona shall comply with the International Fire Code incorporated as the State Fire Code and modified only by Article 3, and Article 3 confines itself to definitions, appendices, permits, inspections and fireworks without reaching Chapter 9. The Arizona Fire Code 2024 has been in force since 13 April 2026, replacing the 2018 edition that ran from 7 January 2022. Section 915.1.1 of that edition requires detection wherever any of four conditions exists, a building containing a CO source, a building containing or supplied by a CO-producing forced-air furnace, a building with an attached private garage, or a building in which a CO-producing vehicle is used, and Section 915.1 excepts only Group S, F and U occupancies that are not normally occupied. So a classroom is no longer reached by being a classroom; the building is reached by what is in it. What a school owes where it is reached is heavier than an alarm. Section 915.2.3 provides that "a carbon monoxide system that uses carbon monoxide detectors shall be installed in Group E occupancies", with alarm signals "automatically transmitted to an on-site location that is staffed by school personnel", subject to an exception on that transmission. That is a supervised system rather than a shop-bought device. A school already standing is reached too, which was not true under the edition Arizona left. Section 1103.9 now reads that "carbon monoxide detection shall be installed in existing buildings where any of the conditions identified in Section 915.1.1 exist", in the Section 915.2 locations and to Section 915.4, with solely battery-operated alarms permitted where the code in force at construction required no detectors. The 2018 text it replaced reached "existing dwelling units and sleeping units" and named no occupancy group, so it carried nothing to a classroom at all. Arizona climate moves which trigger fires: a gas water heater, a commercial kitchen or a shop with fuel-burning equipment will do it more often here than a furnace serving classrooms. An all-electric school with no attached garage still meets none of the four conditions.

Workplaces: it depends, and the test is one you can apply to the building itself. A repair shop that runs vehicles indoors is named in the code by that description, which is the clearest measure of how far this answer has moved. Ariz. Admin. Code R4-36-201 incorporates the International Fire Code as the State Fire Code and binds any person residing, doing business or physically present in the state to it, and the Arizona Fire Code 2024 has been in force since 13 April 2026. Section 915.1.1 requires carbon monoxide detection wherever a building contains a CO source, contains or is supplied by a CO-producing forced-air furnace, has an attached private garage, or has a CO-producing vehicle used within it. Section 915.1 excepts only Group S, Group F and Group U occupancies that are not normally occupied. So the old answer, that Section 915.1.1 named Group I-1, I-2, I-4 and R and Group E classrooms and no Group B, F, M or S, describes an edition Arizona has left. A workplace is now in or out on what it burns and what it parks, not on its occupancy group. A repair shop running vehicles indoors is inside the fourth condition by name. An office with a gas-fired furnace is inside the second. A warehouse nobody normally occupies is inside the Group S exception and stays out. Section 1103.9 carries the same four conditions to a building already standing. Arizona still writes no carbon monoxide statute of its own, so the fire code is the whole of the answer and there is no second instrument to consult.

When Are CO Alarms Required?

Buildings with fuel-burning appliances
Licensed sober living homes: CO detectors required when there is a gas line in the home (A.A.C. R9-12-206(A)(3)).
Licensed transitional housing facilities: policies must address installation of functioning CO detectors and compliance with local fire codes (ARS 36-4202).
Local building codes: Phoenix, Tucson, Scottsdale, Mesa and Tempe all adopt the International Residential Code for new residential construction, but the section number depends on the edition. Through the 2021 edition carbon monoxide alarms sit at Section R315; the 2024 edition renumbered them to Section R311 and gave R315 to sleeping lofts. Mesa and Tempe were read directly on 2026-08-11 and both print the alarm rule at R311.6 under headings naming the 2024 edition. Cite the section together with the edition the city has adopted, and check that adoption date, because it varies between neighbouring cities.

Where to Install CO Alarms

Sober living home: a bedroom used by a resident (R9-12-206(A)(3)(a)).
Sober living home: a hallway (R9-12-206(A)(3)(b)).
Sober living home: the kitchen (R9-12-206(A)(3)(c)).

For detailed placement guidance beyond legal requirements, see where to place carbon monoxide detectors.

Device Requirements

Either battery operated or, if hard-wired into the electrical system of the sober living home, have a back-up battery (R9-12-206(A)(4)(a)).
In working order (R9-12-206(A)(4)(b)).

Landlord and Tenant Responsibilities

Landlord: Arizona writes no carbon monoxide duty for a landlord. A.R.S. 33-1324 requires compliance with applicable building codes materially affecting health and safety, repairs sufficient to keep the premises fit and habitable, and maintenance in good and safe working order of all electrical, heating and ventilating facilities and appliances. The section names no device, so a carbon monoxide alarm arrives as a health and safety condition rather than as a listed obligation. Provision: A.R.S. 33-1324.

Sober living home: the manager is responsible for CO detectors per R9-12-206.
ARS Title 33, Chapter 10, the Residential Landlord and Tenant Act, imposes no carbon monoxide obligation. Its habitability section, 33-1324, is the landlord's general duty to maintain. It requires compliance with applicable building codes materially affecting health and safety, plus repairs, safe common areas, working electrical, plumbing, heating and cooling, waste removal and running hot water. It names neither carbon monoxide nor smoke alarms, so in Arizona the alarm duty a tenant can point to arrives through the building code that 33-1324 refers out to, and that code is adopted by the city.

Enforcement

Enforced by: Arizona Department of Health Services (licensure for sober living/transitional housing) and local fire/building code authorities.

Enforcement typically occurs:

During licensure and compliance checks for sober living homes and transitional housing facilities.
Local building departments enforce IRC R315 during new construction inspections where locally adopted.

What a Tenant Can Do in Arizona

When a carbon monoxide alarm stops working in a rented home in Arizona, these are the five routes a tenant can take and where each one comes from.

"Via general law" means the Arizona carbon monoxide statute itself is silent and the remedy comes from the state's landlord-tenant law instead. The remedy is available even though the alarm rule does not contain it.

Tenant remedies for a defective carbon monoxide alarm in Arizona, with the citation or the body of law searched for each.
Rent withholding	Via general lawA.R.S. 33-1365. Framed as a counterclaim rather than a right to stop paying. In an action for possession based on nonpayment, or for rent while the tenant is still in possession, the tenant may counterclaim for any amount recoverable under the agreement or the chapter, the court determines what each side owes, and the court may order the tenant to pay the undisputed accrued rent and all rent accruing afterwards into court.
Repair and deduct	Via general lawA.R.S. 33-1363. Capped at the greater of $300 or half a month's rent, which is a floor rather than a ceiling for cheap work and makes it one of the few caps in the fifty-one that helps a low-rent tenant more than a high-rent one. The tenant gives written notice and waits ten days, or less where an emergency makes a shorter wait reasonable. Unavailable where the condition came from a deliberate or negligent act of the tenant, the tenant's family, or someone on the premises with the tenant's consent.
Right to end the lease	Via general lawA.R.S. 33-1361. The same written notice that starts the cure clock also fixes the termination date, so the tenant states the breach and the date in one document. A landlord who adequately remedies the breach before that date stops the termination, which means the notice is a deadline and not a decision.
Notice the tenant must give	Via general lawA.R.S. 33-1361. No waiting period attaches to the notice itself, but the notice has to specify the acts and omissions constituting the breach. How it is written decides which of the two clocks in the next column applies, since the shorter one turns on the breach affecting health and safety.
Landlord cure period	Via general law, 5 daysA.R.S. 33-1361. Five days where the noncompliance materially affects health and safety, which is where a dead carbon monoxide alarm in a unit with fuel-burning appliances belongs, and ten days for other material breaches. A third clock sits in 33-1363: repair-and-deduct opens ten days after notice regardless of severity, so a tenant whose termination right matures in five days still waits ten to fix the thing themselves.

Applies to every row above:The Arizona Residential Landlord and Tenant Act is a URLTA adoption and the numbering maps cleanly onto the model: 33-1324 is the landlord's duty to maintain, 33-1361 the noncompliance section, 33-1363 the repair-and-deduct section. That last mapping is worth holding next to Alabama, which adopted the identical architecture and left the equivalent slot reserved: Alabama's 35-9A-403 is the same numbering position and reads "Reserved", while Arizona filled it. Two states took the same model act and made opposite choices about whether a tenant may spend money on a repair and take it off the rent. Arizona has no CO-specific rental statute, so every column below comes from the act, and the cure period splits by severity rather than running on one clock.

Remedies last checked 2026-08-03. Compare Arizona with the other states.

What Arizona Requires in Lodging

The Arizona carbon monoxide requirement reaches hotels and short-term rentals.

Hotels already standing: covered too. The Arizona requirement reaches an existing hotel and not only one being built.

Operator duty: Arizona has no statewide carbon monoxide statute, so a hotel operator's duty arrives through the fire code instead. Ariz. Admin. Code R4-36-201 says that "any person residing, doing business, or who is physically present within the state of Arizona shall comply with the provisions of the International Fire Code (2024 Edition)", incorporated as the State Fire Code and modified only by Article 3. Running a hotel is doing business, and Article 3 confines itself to definitions, appendices, permits, inspections and fireworks, leaving Chapter 9 of the code as published. That chapter carries Section 915, which requires carbon monoxide detection in Group R occupancies where a sleeping unit holds a fuel-burning appliance, is served by a fuel-burning forced-air furnace, sits in a building containing fuel-burning appliances, or adjoins an attached private garage. Because the whole code is incorporated rather than its new-construction chapters alone, the existing-building requirement in Chapter 11 comes with it, which is what reaches a hotel that was built years ago. Note the split in Arizona: the state adopts this fire code, while the residential code that governs houses is adopted city by city.

Full Arizona hotel and short-term rental requirements

Penalties for Non-Compliance

No statewide CO-specific penalties. Sober living home violations fall under licensure enforcement. Local code violations subject to local enforcement mechanisms.

Additional Notes

Arizona has no statewide residential CO alarm statute, and the two numbers most often cited as one fail in different ways. ARS 36-1451 does not exist: the 36-14xx range is the public housing authority article, which opens at 36-1401 with definitions and runs on through housing authority powers, bonds and tenant selection. ARS 36-601 does exist, which is why it survives repetition, but it is the public nuisances chapter of the public health title and carries no detector requirement. Checked again on 2026-08-12 against a control, a section that does resolve, so the negative is a real absence rather than a broken lookup.
The statewide fire code applies to commercial occupancies but the IRC is NOT adopted statewide, only the IFC, IBC, IEBC and UMC. The fire code edition is the 2024 International Fire Code, incorporated by Ariz. Admin. Code R4-36-201 by final rulemaking at 32 A.A.R. 558, effective 13 April 2026, in place of the 2018 edition that ran from 7 January 2022.
Major cities adopt the IRC locally and not on the same edition, which changes the section number as well as the substance. Mesa and Tempe were read on 2026-08-11 and both carry the carbon monoxide alarm rule at Section R311.6, in chapters headed as amendments to the 2024 International Residential Code. That is the 2024 numbering: the alarm section moved from R315 to R311 in that edition, and R315 now covers sleeping lofts. A city still on the 2018 or 2021 edition keeps the alarm rule at R315. Confirm the adopted edition with the building department before relying on any section number.

Local Rules That Differ From State Law

We checked the municipal codes listed below and found no Arizona city rule that differs from the statewide requirement. The state rule is the operative one for those jurisdictions. Smaller municipalities were not all searched, so confirm with your local building or fire official before treating this as complete.

What was checked:Read this entry differently from the other states in this dataset, because Arizona inverts the question. Everywhere else a municipal overlay is something added on top of a statewide duty. Arizona has no statewide carbon monoxide statute for ordinary housing, so the city code is not an overlay at all: it is the whole source of the requirement. What was searched for here is therefore whether any Arizona city goes beyond the model code it adopted, and the answer across eight municipalities is that none does. Read on 2026-08-10: Tucson, Mesa, Chandler, Scottsdale, Tempe, Sierra Vista and Page, all control-tested against terms their own indexes return. Their carbon monoxide hits are of three kinds and none is a duty on a dwelling. Scottsdale and Tempe regulate wood stoves and solid fuel burning devices for air quality. Several list carbon monoxide among the industrial gases their fuel gas codes do not cover. Tucson's single hit praises mature vegetation for removing the gas from the air. Mesa and Tempe do amend the residential code section on carbon monoxide alarm power sources, and both amendments restate the model text word for word, including its two exceptions, which is the formality of local adoption rather than a change. Phoenix cannot be answered from its municipal code, and the code says so itself. Chapter 9, Building, has three sections, and the editor's note under them records that the Construction Code of the City of Phoenix is "not set out in this volume" and is held on file with the City Clerk and the Building Safety Director. Chapter 15, Fire Prevention, says the same of the Fire Prevention Code: not printed, saved from repeal, on file with the Clerk. So the two instruments that would carry a Phoenix carbon monoxide rule are not in the published code, and no search of it could ever have found one. Chapter 39, the Neighborhood Preservation Ordinance, which is the city's housing maintenance code and the one place a rental duty could have sat, was read section list by section list and contains no carbon monoxide, smoke, alarm or detector provision. This is the same shape as Las Vegas adopting the Southern Nevada Amendments as a separate document, and it is the second time this sweep has met it. Two access limits, recorded so the next attempt starts further along. Phoenix, Flagstaff and Sedona all publish through Code Publishing Company, whose live sites answer a Cloudflare JavaScript challenge to every route, including their own robots files. Phoenix's robots file is readable and disallows AI agents by name, so its content here comes from Internet Archive captures rather than from the publisher, and those captures are codified through Ordinance G-6919 of November 2021 while the live code runs to G-7516 of May 2026. Flagstaff is only partly archived: its electrical amendments chapter reads clean, and the residential and building amendment chapters, which is where an alarm rule would sit, have no capture at all. Sedona has no usable capture. Treat Flagstaff and Sedona as unread rather than clean. Re-searched on 2026-08-11 after the publisher's search engine turned out not to match plurals, which put every negative on this site resting on a singular phrase in doubt. Both forms of every term were run against all seven readable cities. Nothing changed, and the reason is that Arizona's answer never rested on a pluralisable phrase in the first place: the assertion here is a zero for "carbon monoxide", which has no plural. Chandler, Sierra Vista and Page return nothing on either form. Tucson, Mesa, Scottsdale and Tempe return the same eight provisions as before, and re-reading them confirms the three families described above rather than adding a fourth. The finding stands and is now better evidenced than it was.

Local sweep last reviewed 2026-08-10.

Official Sources & References

Arizona Administrative Code Title 4 Chapter 36, Department of Forestry and Fire Management, as published by the Secretary of State , R4-36-201, Incorporation by Reference of the International Fire Code, with its historical note (fire code, accessed 2026-08-24)
Arizona's own published chapter, and the control for the edition. Read on 2026-08-24 through r.jina.ai because apps.azsos.gov answers HTTP 403 to a direct fetch. The section incorporates the "International Fire Code (2024 Edition)", and its historical note ends "final rulemaking at 32 A.A.R. 558 (March 6, 2026, Issue 10), effective April 13, 2026 (Supp. 26-1)". The chapter footer reads "March 31, 2026 Supp. 26-1". This is what the edition on this page rests on; before it was read the 2024 date came from a code catalogue, and the Cornell copy of the same section still names the 2018 edition, so a reader checking the rule at the obvious URL is given the superseded answer.
Arizona Administrative Code R4-36-201, Incorporation by Reference of the International Fire Code , R4-36-201 (fire code, accessed 2026-08-04)
The instrument that settles lodging in Arizona. Incorporates the International Fire Code as the State Fire Code and binds any person residing, doing business or physically present in the state, modified only by Article 3, whose sections run to definitions, appendices, permits, inspections and fireworks and do not touch Chapter 9 or Section 915. The edition moved on 13 April 2026: the Arizona Fire Code 2024 replaced the Arizona Fire Code 2018, which had run from 7 January 2022. Cornell LII still renders R4-36-201 with the 2018 edition named, so it is the stale copy on this point.
Arizona Revised Statutes § 36-2062 (Sober living homes) , §36-2062 (state code, accessed 2026-02-16)
Sober living home policies must address CO detectors and local fire code compliance.
Arizona Revised Statutes § 36-4202 (Transitional housing facilities) , §36-4202 (state code, accessed 2026-02-16)
Transitional housing policies must address CO detectors and local fire code compliance.
Arizona Administrative Code, Sober Living Homes (Title 9, Chapter 12), R9-12-206 Emergency and Safety Standards , R9-12-206(A)(3)-(4) (agency guidance, accessed 2026-02-16)
Detailed CO detector placement and device requirements for licensed sober living homes.
Arizona Revised Statutes § 36-601, Public nuisances dangerous to public health, and the Title 36 section index , ARS 36-601; ARS Title 36 sections 36-1401 onward (state code, accessed 2026-08-12)
Carries the negative half of this page's central claim, which had no source behind it before. ARS 36-601 resolves and is headed "Public nuisances dangerous to public health", with no detector requirement in it. ARS 36-1451 does not resolve at all, while ARS 36-601 does on the same publisher and the same request pattern, which is the control that makes the absence a finding rather than a failed lookup; the 36-14xx range is the public housing authority article beginning at 36-1401. Both numbers circulate in consumer carbon monoxide guides as Arizona's residential statute and neither supports that.
Arizona Revised Statutes § 33-1324, landlord to maintain fit premises , ARS 33-1324 (state code, accessed 2026-08-12)
Read to settle what the Residential Landlord and Tenant Act does and does not carry. 33-1324 is the habitability section: it obliges the landlord to comply with applicable building codes materially affecting health and safety, to make repairs, to keep common areas safe, to maintain electrical, plumbing, heating and cooling, to arrange waste removal and to supply running hot water. It names neither carbon monoxide nor smoke alarms. The chapter was previously described here as covering smoke detectors at 33-1324, which the section text does not support; corrected on 2026-08-12. The practical consequence is that the act routes a tenant back to the building code, and in Arizona that code is municipal.

Disclaimer: This page explains the law as it stood on August 24, 2026. It is general information, not legal advice, and reading it creates no attorney-client relationship. Requirements vary by city, county and building type, and statutes and codes are amended: confirm the current text with the issuing authority before acting on it. Each requirement here cites the instrument it comes from, so you can check it at source.

Frequently Asked Questions

Is there a statewide Arizona home mandate for CO alarms?

No broad statewide Arizona statute requires carbon monoxide alarms in every private home. The nearest thing to one appears in ARS 36-2062 and A.A.C. R9-12-206, which address licensed sober living operations rather than residential occupancy generally, and the Residential Landlord and Tenant Act adds nothing: it carries no carbon monoxide duty, and its habitability section at 33-1324 refers a tenant out to the applicable building code instead. For standard single-family homes and most rentals the requirement therefore comes from the city. Two statute numbers circulating as Arizona's residential mandate are worth naming so they can be dismissed: ARS 36-1451 does not exist, and ARS 36-601 exists but is the public nuisances chapter.

What does ARS 36-2062 require for sober living homes?

ARS 36-2062 and related rule language in A.A.C. R9-12-206 require licensed sober living homes to provide functioning carbon monoxide detectors in specified locations. The rule set addresses bedroom, hallway, and kitchen coverage and allows battery or hardwired devices with backup depending on configuration. Because these are licensure-linked requirements, noncompliance reaches the licence rather than a fine schedule, which is a sharper consequence than the one facing an ordinary Arizona landlord. The state can act against the operator's authority to run the home at all, where the general housing stock answers only to whichever municipal code edition applies.

How do Arizona apartments and condos get CO requirements?

For many apartments and condos in Arizona, carbon monoxide alarm duties are defined by locally adopted building and fire codes rather than one statewide residential detector statute. Municipal adoption of IRC or IFC language can create enforceable placement and power requirements, especially during new construction or permit-based renovation. Property managers should verify the exact code edition in the city where the building sits, then align lease operations and maintenance procedures with that local framework. This local-first process is the practical compliance standard across most Arizona multifamily portfolios.

With no statewide rule, who decides if my all-electric Arizona house needs an alarm?

Often not, but the answer comes from the city rather than from the fuel. Arizona has no statewide residential mandate to exempt yourself from, so the question is what the locally adopted International Residential Code edition says, and the model text triggers on fuel-fired appliances and attached garages. An all-electric detached house with no attached garage will usually fall outside it. Two things reopen the question in multifamily buildings: an attached garage serving the building, and combustion equipment in a shared or neighbouring space, because the model section reaches dwelling units in buildings containing fuel-fired appliances and not only units containing them. Read the adopted edition rather than the model, since Mesa and Tempe are on the 2024 numbering at R311.6 while cities still on 2018 or 2021 keep it at R315.

Where should detectors be placed in Arizona sober living operations?

A.A.C. R9-12-206 provides direct Arizona placement guidance for licensed sober living homes, including bedroom, hallway, and kitchen coverage. Devices must remain in working order, and power configuration must meet the rule requirements for battery or hardwired units with backup. The condition that starts the duty is worth noting on its own, because it is not the one most codes use. R9-12-206(A)(3) attaches when there is a gas line in the home, rather than turning on a fuel-burning appliance or an attached garage the way the model residential code does. A gas line serving a home with no combustion appliance currently connected still meets the words of the rule, which makes this a broader trigger than the municipal codes covering ordinary Arizona housing.

For Arizona operators, what compliance step differs most from California practice?

Arizona and California use different legal models. California has a broader statewide residential framework in Health and Safety Code Section 17926 and CRC R315, while Arizona primarily uses targeted statewide rules for licensed settings plus local code adoption for many homes and rentals. Multi-state operators should not reuse one checklist across both states. For a statewide-residential comparison point, review California CO detector laws before setting procurement, inspection, and maintenance policies.

Practical CO Detector Guides

Beyond legal requirements, these guides help you choose, install, and maintain CO alarms:

Where to place carbon monoxide detectors, room-by-room placement recommendations
CO detector beeping patterns, what different alarms mean
What to do if your detector goes off, emergency response checklist
CO resources and links, official agencies and safety information