Rental CO Compliance Check

Carbon monoxide detector requirements for rental properties vary by state, property type, and even the age of the building. Some states require CO alarms in every rental with a fuel-burning appliance. Others require them in all residential units regardless of fuel source. A few states have no statewide CO detector mandate at all — though federal rules may still apply.

This 2-minute check asks about your state, property type, fuel sources, and current detector setup. Based on your answers, it produces a compliance assessment — whether your rental's CO detector situation is likely compliant, may have gaps, or is unclear and worth investigating further.

The check is designed for both landlords and tenants. If you are a landlord, the results include a checklist of actions to verify compliance. If you are a tenant, the results explain what your landlord is typically responsible for and what steps you can take if detectors are missing or expired.

This is not legal advice. CO detector requirements are set by state and local codes, which can change. The results of this check reflect general patterns in state law as of early 2026, but your specific situation may be governed by a local ordinance, a lease clause, or a housing authority rule that differs from the state baseline. When in doubt, consult your local code enforcement office or a qualified attorney.

In 2 Minutes

• Most U.S. states now require CO detectors in rental properties that have fuel-burning appliances or an attached garage.
• At the federal level, all HUD-assisted housing must have CO detectors as of December 2022 (per NSPIRE standards).
• In most states, the landlord is responsible for installing CO detectors; the tenant is often responsible for battery replacement and not disabling the unit.
• CO alarms must typically be placed within 15 feet of each sleeping area, on every level of the home, and near fuel-burning appliances.
• All-electric homes are exempt from CO detector requirements in many states — but not all.
• Penalties for non-compliance range from written notices to fines of $200–$500 per violation, depending on the state.

What This Check Covers

• Whether your state has a CO detector requirement for rental properties.
• Whether your property type (single-family, apartment, Airbnb/STR, Section 8) triggers additional rules.
• Whether your fuel sources (gas furnace, water heater, stove, fireplace, attached garage) require CO detection.
• Whether the detectors you have are likely placed correctly and are current (not expired).
• Who is typically responsible — landlord or tenant — for installation, testing, and battery replacement.
• Whether federal HUD/NSPIRE rules apply to your property.
• What to do if your rental appears to have a compliance gap.

Start the Check

How to Interpret Your Result

This check produces one of four results:

• Likely Compliant: Your answers suggest your rental's CO detector setup is consistent with your state's general requirements. This result includes a maintenance checklist and a link to your state's specific law page.
• Likely Compliant — Verify Details: The basics appear to be in place, but one or more details (detector age, placement, or property type) may need a closer look. This result includes specific items to verify.
• Potential Gaps Identified: Your answers suggest one or more areas where your rental's CO detector setup may not meet your state's requirements. This result includes a prioritized action list.
• Requirements Unclear — Consult Local Code: Your state does not have a clear statewide CO detector mandate, or your situation involves factors this check cannot evaluate. This result recommends specific next steps.

Sources & References

1. National Conference of State Legislatures (NCSL) — Carbon Monoxide Detector Installation Statutes . Complete table of all state CO detector laws.
2. U.S. Consumer Product Safety Commission (CPSC) — Carbon Monoxide Fact Sheet . UL 2034 standard, annual statistics.
3. U.S. Department of Housing and Urban Development (HUD) — PIH Notice 2022-01: Carbon Monoxide Alarm/Detector Requirements . Federal mandate for all HUD-assisted housing, effective December 27, 2022.
4. National Low Income Housing Coalition (NLIHC) — HUD Will Enforce Carbon Monoxide Alarm/Detector Installation in HUD-Assisted Housing . Summary of federal enforcement.
5. Centers for Disease Control and Prevention (CDC) — Carbon Monoxide Poisoning Prevention . Annual death and ER statistics.
6. U.S. Environmental Protection Agency (EPA) — Carbon Monoxide's Impact on Indoor Air Quality . Detector guidance, health effects.
7. UL Solutions — Carbon Monoxide Alarm Considerations for Code Authorities . UL 2034 standards, state adoption of IFC/IRC.
8. National Fire Protection Association (NFPA) — Carbon Monoxide Safety . NFPA 72 placement standards.
9. California Health and Safety Code § 17926 (SB 183) — California CO Detector Requirements . California's landmark CO detector law for residential properties.
10. Centers for Disease Control and Prevention (CDC) — Carbon Monoxide Poisoning Prevention: A Toolkit . Prevention resources and best practices.