Carbon monoxide is colorless, odorless, and produces symptoms that doctors often mistake for the flu. By the time most people realize what has happened, they have already been exposed long enough for serious injury. If you or a family member was harmed by CO in California — in a rental unit, hotel, workplace, or home — a carbon monoxide poisoning lawyer at J&Y Law can help you identify who was responsible and what compensation you may be able to recover.
Call or text (877) 735-7035 for a free consultation. You pay nothing unless we recover compensation for you.
What Carbon Monoxide Does to the Body
Carbon monoxide forms when fuels — gas, oil, wood, propane, charcoal — burn without enough oxygen. It binds to hemoglobin in your blood up to 250 times more readily than oxygen does, according to research published via the National Institutes of Health. The result is that your blood carries CO instead of oxygen to your brain, heart, and other organs.
Carbon monoxide toxicity typically produces headache, nausea, dizziness, and confusion. Prolonged or high-level exposure can cause loss of consciousness and cardiac arrhythmia, and at sufficient concentrations will produce irreversible brain damage. Death can occur before the person realizes anything is wrong, particularly during sleep. California recorded the highest total number of accidental CO deaths of any state — 170 — during the 2016–2020 study period tracked by the CDC.
Even after someone appears to recover, delayed neurological problems can develop 1 to 40 days later. Medical literature refers to this as Delayed Neurological Sequelae (DNS) — a condition involving memory loss, personality changes, and cognitive decline that appears after a period of seeming recovery. Published research in PMC/NCBI estimates DNS affects between 1% and 47% of patients after significant CO exposure, depending on the measurement method used. If you or a family member seemed fine after initial treatment but developed cognitive or psychiatric symptoms weeks later, that pattern may be consistent with documented CO injury and can significantly affect the damages analysis.
Common Sources of CO Exposure in California
CO exposure is almost always preventable, and recognizing the source is the first step toward identifying who failed to prevent it:
Faulty or unvented gas appliances. Furnaces, water heaters, gas stoves, and space heaters that malfunction or vent incorrectly are among the most common sources in California residences. A cracked heat exchanger in a forced-air furnace can silently flood living spaces for entire heating seasons.
Attached garages. A car left running in an attached garage — even briefly — can send CO through walls and floor gaps into the living area. California Health and Safety Code § 17926 requires CO detectors in dwelling units with attached garages for this reason.
Portable generators. The Federal Emergency Management Agency and the CDC warn repeatedly against operating generators indoors or near windows and doors. Despite those warnings, generator-related poisoning incidents spike after major storms and wildfires knock out power across California.
Gas-powered tools and equipment. Pressure washers, construction machinery, and forklifts used in enclosed or poorly ventilated spaces create hazardous CO concentrations quickly.
California Law: Who Can Be Held Liable
California gives CO poisoning victims several legal paths to compensation, depending on the source and circumstances of the exposure.
Negligence Under Civil Code § 1714
California Civil Code § 1714 requires every person to use ordinary care in managing their property so as not to harm others. When a property owner or manager allows a CO hazard to exist — through neglect of appliances, failure to install detectors, or inadequate ventilation — that is a failure of the legal duty they owe you. Our Los Angeles premises liability lawyers handle claims against private property owners, commercial landlords, retailers, and government entities.
The Carbon Monoxide Poisoning Prevention Act and Landlord Duties
California enacted the Carbon Monoxide Poisoning Prevention Act in 2010 (Health and Safety Code §§ 13260 et seq.). Under Health and Safety Code § 17926, every owner of a dwelling intended for human occupancy must install a CO alarm approved by the State Fire Marshal if the unit has a fossil fuel burning heater or appliance, fireplace, or an attached garage. Rental units require detectors on every floor of the unit.
California landlords must also maintain habitable rental housing, including safe heating systems, under Civil Code § 1941. A landlord who skips detector installation, delays repairs to a malfunctioning furnace, or ignores tenant complaints may face liability under both the statute and premises liability law. When a landlord violates a safety statute and that violation causes injury, California courts may find negligence per se — meaning the statutory violation itself establishes the breach of duty without requiring additional proof of carelessness.
Product Liability
When the CO source is a defective appliance, detector, or vehicle component, the manufacturer or distributor may bear responsibility under California product liability law. A furnace that cracks at the heat exchanger after routine use, or a CO alarm that fails to sound at dangerous concentrations, may support a products claim alongside a premises claim.
Wrongful Death
When CO exposure kills a family member, California law allows eligible survivors — spouses, domestic partners, and children — to pursue a wrongful death claim under Code of Civil Procedure § 377.60. Our wrongful death attorneys pursue compensation for funeral costs, lost financial support, and loss of companionship. In cases involving egregious landlord or manufacturer negligence, punitive damages may also be available under Civil Code § 3294.
Who May Be Named as a Defendant
Multiple parties can bear responsibility in the same case. Defendants in a California CO poisoning claim commonly include:
Residential landlords and property management companies. A landlord who knew a furnace was malfunctioning, received complaints, and delayed repairs is the most common defendant. When a property management firm handles maintenance decisions, the entity responsible for those decisions — not just the property owner of record — may also be liable.
Appliance manufacturers and HVAC contractors. A furnace or stove with a design or manufacturing defect can support a product liability claim against the maker. A technician who improperly installs or services a heating system, or signs off on a unit that is not venting safely, may bear direct liability.
Hotels, vacation rentals, and short-term rental operators. Hotels, vacation rentals, and short-term rental operators may be liable when unsafe property conditions expose guests to carbon monoxide. The exact legal theory depends on who controlled the property, who maintained the appliance, and what safety rules applied to that particular type of occupancy.
Employers. When a worker is exposed to CO because of unsafe equipment or inadequate ventilation on a job site, both workers’ compensation and third-party negligence claims may be available.
The Medical Evidence That Drives a CO Poisoning Claim
Insurance adjusters and defense attorneys routinely challenge these claims by arguing symptoms were caused by something else — especially when there is a gap between exposure and diagnosis. The records that counter that argument include:
Carboxyhemoglobin blood test. A blood gas test showing elevated COHb levels, drawn close in time to the exposure, is the most direct medical evidence. Normal COHb in non-smokers is generally below 3%, and readings above 20% indicate moderate to severe poisoning. If you were treated in an emergency room after suspected CO exposure, this test may already exist in your records.
Delayed neurological testing. Because DNS can develop weeks after the initial event, neuropsychological testing conducted in the weeks following exposure may document cognitive and psychiatric changes that would not appear on standard imaging — and is often decisive in cases where the initial COHb level had already normalized.
Fire department and first-responder reports. California fire departments measure CO concentrations at the scene and record the readings in incident reports. Those readings — taken before the source was altered — establish the concentration the occupants were exposed to and often identify the appliance where CO was detected.
Appliance and maintenance records. Furnace service records showing skipped maintenance, prior complaints, or known defects are powerful evidence of a landlord’s or contractor’s prior knowledge.
Code enforcement records. Code violations related to appliances, ventilation, or missing CO detectors document a property owner’s failure to comply with California law.
If you did not keep these records yourself, do not assume they are gone. Our team requests them from fire departments, hospitals, and municipal code enforcement offices — before critical evidence is lost.
What to Do After Carbon Monoxide Exposure
Get out and call 911. Leave the building immediately. Do not re-enter until emergency responders have measured CO levels and declared the space safe.
Ask for a carboxyhemoglobin test at the ER. COHb clears from the blood within hours of treatment. Tell the treating physician you suspect CO exposure so they order the right test — a delay of even a few hours can reduce the measured level enough to affect your claim.
Prevent the source from being altered before it is inspected. Appliance replacements or repairs that happen before an independent inspection destroy evidence. Document everything you can with photographs and video.
See a neurologist if symptoms persist or return. Even if you felt better after initial treatment, symptoms that develop or worsen in the weeks that follow should be evaluated. DNS requires a documented medical record to support a damages claim.
Contact J&Y Law before speaking with an insurance company. Property owners’ liability insurers often make quick contact after poisoning events. Accepting any payment or signing any document before consulting an attorney may limit your ability to recover full compensation.
What Compensation You May Be Able to Recover
Serious CO poisoning damages the organs that have the least tolerance for oxygen deprivation — primarily the brain and heart — and the effects often require years of medical management. Compensation in a California CO poisoning case may include:
Medical expenses. Emergency treatment, hyperbaric oxygen therapy, hospitalization, neurological care, and future medical costs related to the poisoning.
Lost wages and earning capacity. Time missed from work during recovery, as well as long-term wage loss when CO-related neurological damage reduces a person’s ability to work at the same capacity as before.
Pain and suffering. Physical pain during the acute phase of poisoning and the ongoing distress associated with cognitive or neurological impairment, including anxiety, depression, and PTSD that follow significant exposure.
Cognitive and neurological impairment. Memory loss, attention deficits, executive dysfunction, and personality changes are recognized non-economic injuries.
Wrongful death damages. When a family member does not survive, eligible survivors may recover funeral expenses, the financial support the decedent would have provided, and the value of the companionship they have lost.
California’s Statute of Limitations for CO Poisoning Claims
Under California Code of Civil Procedure § 335.1, the statute of limitations for most personal injury claims — including CO poisoning — is two years from the date of injury or discovery of the injury. The discovery rule applies: if you did not connect your symptoms to CO exposure until later, the clock may run from the date you reasonably could have known about the connection.
Two years passes quickly when you are focused on recovery, and delay has practical costs. Faulty appliances get replaced before experts can inspect them. The firefighters who measured CO levels on the night of the incident retire or transfer. Speak with an attorney promptly — even if you are still in the middle of treatment.
Why J&Y Law
CO poisoning cases are not standard slip-and-fall claims. They require fast evidence preservation before appliances are repaired or replaced, inspection of the CO source by qualified engineers or industrial hygienists, analysis of medical timing to establish what the initial COHb level was versus what may have been measured after hours of oxygen treatment, and expert support to document DNS if neurological symptoms develop after the initial event.
J&Y Law has represented injured Californians since 2009, recovering tens of millions of dollars for clients in personal injury, premises liability, product liability, and toxic exposure cases. Our founders, Jason Javaheri and Yosi Yahoudai, were named among the LA Times Visionary Consumer Attorneys for 2025. We handle CO poisoning claims on a contingency fee basis — no attorneys’ fees unless we recover compensation for you, and we advance case costs.
Call or text (877) 735-7035 or complete a free case evaluation form online to tell us what happened.
Frequently Asked Questions
Do I need to have had a working CO detector to file a claim? No. The absence of a detector that a landlord was required to install under California Health and Safety Code § 17926 can itself be evidence of negligence — it often strengthens the case against the landlord rather than weakening yours.
What if the CO source was a neighbor’s unit or a shared boiler system in a multi-family building? Multi-family building cases frequently implicate shared mechanical systems — central boilers, shared HVAC, or connected parking structures. The property owner or management company responsible for those systems owes a duty to all occupants, not just the tenant nearest the source.
What if I was poisoned at a hotel, Airbnb, or vacation rental? Hotels, vacation rentals, and short-term rental operators may be liable when unsafe property conditions expose guests to carbon monoxide. The applicable legal theory — premises liability, product liability, or both — depends on who controlled the property, who maintained the appliance, and what safety requirements applied to that type of occupancy. Platform liability in Airbnb cases depends on the specific facts of how the listing was managed.
What if my employer’s equipment caused the exposure? If CO exposure happened at work, workers’ compensation provides medical and wage replacement benefits regardless of fault. If a third party — a contractor, an equipment manufacturer, or a property owner who is not your employer — contributed to the exposure, a separate personal injury claim may also be available.
Can I file a claim if my family member died from CO poisoning? Yes. Eligible surviving family members — spouses, domestic partners, children, and in some cases parents — may bring a wrongful death claim under California Code of Civil Procedure § 377.60. The two-year statute of limitations runs from the date of death. Our wrongful death attorneys handle these cases throughout California.
