Portland enforces NFPA 58 (the 2020 Maine LP Gas Code) through its adoption of NFPA 1 in Chapter 10 of the City Code. Residential propane cylinders must comply with NFPA 58 size limits (no more than two 100-lb DOT cylinders connected on the exterior of a one- or two-family home), with mandated separation distances from openings and ignition sources.
Portland Code of Ordinances Chapter 10 adopts the Maine Fire Code (NFPA 1) by reference, which in turn incorporates NFPA 58, the Liquefied Petroleum Gas Code. The State of Maine has adopted the 2020 edition of NFPA 58 as the Maine LP Gas Code (administered by the Office of the State Fire Marshal under 25 M.R.S. §2452 and §2469). For residential occupancies, NFPA 58 Chapter 6 limits exterior LP-gas storage at a one- or two-family dwelling to 200 lb (two 100-lb DOT cylinders) per Table 6.4.4.1; ASME tanks larger than 125 gal water capacity must be set back at least 10 ft from buildings, lot lines, and any source of ignition (NFPA 58 §6.4.4). Cylinders must be installed upright on a non-combustible base, protected from vehicle impact, and located at least 5 ft horizontally from any building opening (door, window, vent) below the cylinder relief valve. Indoor storage of LP cylinders for use (other than 1-lb camp cylinders) is prohibited at residential occupancies. Commercial users with bulk plants or fleet refueling must register with the Office of the State Fire Marshal and submit plans for review under 25 M.R.S. §2469. Marking and filling of cylinders is also subject to 10 M.R.S. §1658-A. Portland does not impose additional municipal restrictions beyond NFPA 58 / state law.
Violations of NFPA 58 — enforced through Chapter 10 by the Portland Fire Prevention Bureau and by the Office of the State Fire Marshal — are subject to municipal civil citations and to state enforcement under 25 M.R.S. §2455 (civil violation, up to $1,000 per offense; injunctive relief). Filling another's cylinder without authorization violates 10 M.R.S. §1658-A (civil penalties). Causing a propane leak or fire through non-compliance may carry liability under 17-A M.R.S. §803 (reckless burning, Class D).
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