If you smell gas — emergency response
Propane is odorized with ethyl mercaptan (rotten-egg smell) for leak detection. If you smell gas: LEAVE the building, SHUT OFF the tank service valve if safe, CALL your dealer and fire department from outside. Do not operate switches, phones, or lighters until cleared. See leak detection and what to do if you smell gas.
Carbon monoxide
Carbon monoxide from incomplete propane combustion is the dominant lethal hazard in propane households — more than tank explosions. CO is colorless, odorless, and lethal at sustained exposure. UL-listed CO detectors on every occupied floor are essential. See CO and propane and CO detectors.
Regulations — NFPA 58
NFPA 58 (Liquefied Petroleum Gas Code) is the master US safety standard, adopted by reference in nearly every state. Federal layers from US DOT (cylinder transport) and OSHA (workplace handling) overlay state code. See safety regulations.
Practical safety
Three high-leverage practices: annual professional inspection, working CO detectors on every floor, and household-wide familiarity with the smell of propane plus the LEAVE-SHUT-CALL procedure. See safety tips.