NFPA 58 — the master code
NFPA 58 (Liquefied Petroleum Gas Code) is the master US safety standard. Published by the National Fire Protection Association and adopted by reference in nearly every US state, it governs:
- Tank design, construction, and labeling requirements
- Setback distances from buildings, property lines, openings, ignition sources
- Fill procedures (the 80% rule, driver qualifications)
- Vehicle and cargo handling
- Odorization (mandatory ethyl mercaptan)
- Leak-test requirements after service interruption
NFPA 54 — the appliance side
NFPA 54 (National Fuel Gas Code) covers the appliance side: gas piping inside buildings, appliance installation, venting, combustion air. Updated every 3 years. Governs everything from pipe sizing for furnaces to flue venting requirements.
Federal layers
- US DOT 49 CFR — cylinder construction, recertification (12-year initial, 5–7 year intervals after), transport rules
- OSHA 29 CFR 1910.110 — workplace LP gas handling, including for propane retail and industrial users
- EPA — classifies propane as a clean alternative fuel under the Clean Air Act
State enforcement
Most US states adopt NFPA 58 by reference through one of three mechanisms:
- State fire marshal — primary authority in most states, enforces NFPA 58 directly
- State LP gas board — dedicated boards exist in Alabama, Arkansas, Louisiana, Mississippi, Oklahoma, South Carolina, and a few other states
- Local building department — handles permitting and inspection within the broader code framework
CETP — technician certification
The Certified Employee Training Program (CETP) is the US propane industry's de facto credential for delivery drivers and service technicians. Administered by the Propane Education & Research Council (PERC) through state propane associations. Modules cover delivery operations, basic principles, dispenser operations, leak detection, regulator service, and cylinder filling. Verify CETP certification when hiring an installer.
Consumer protection variation
Beyond safety code, about 10–15 US states have additional propane consumer-protection statutes: anti-fill laws, mandatory disclosure, capped pickup fees, tank-purchase rights. See your state page for local rules. Propane is otherwise unregulated at the federal level (unlike natural gas utilities) and at the state level in most states.
FAQ
Who can I contact about a safety concern?
Start with your dealer's emergency line. For systemic concerns or violations: state fire marshal's office. For consumer protection issues (mis-charging, contract violations): state attorney general consumer protection division.
Is NFPA 58 law?
Not directly — NFPA publishes standards. But state laws and local codes adopt NFPA 58 by reference, making it legally enforceable. The effect is the same as if it were law: violations carry permit, insurance and liability consequences.