Who enforces each one, what edition applies, and what changes next. 8 of 8 state-level topic areas checked against primary sources. Federal OSHA state.
| Area | In force | Authority | Next |
|---|---|---|---|
| Fire | No single statewide model fire code; DOJ oversees/approves locally-adopted codes (MCA Title 50 ch.61)MCA 50-61-102 (2025 MCA, last amended 2007) puts DOJ in charge of enforcing the public-building fire-safety chapter and lets DOJ approve a city or fire agency's local inspection program after approving its fire code and enforcement plan. No fire-code edition is named in the statute; confirm the locally adopted code with the AHJ. SourceChecked on the source | Montana DOJ, Fire Prevention & Investigation Section (Div. of Criminal Investigation) statewide; DOJ-approved local fire agencies locally | In forceIn force; MCA 50-61-102 re-read Oct 19, 2026 in the 2025 MCA (last amended 2007); no adopted-but-pending edition found |
| Building | 2024 IBC / IRC / Int'l Existing Building Code + 2023 NEC + 2024 Uniform Plumbing Code (ARM 24.301)DLI page lists, effective Sept 26, 2026 under ARM 24.301: 2024 IBC, IRC, IEBC, IECC, Mechanical and Fuel Gas codes, 2024 Uniform Plumbing Code, 2023 NEC, 2024 Swimming Pool and Spa Code and Wildland Urban Interface Code, with state amendments. Confirm local enforcement with the AHJ. SourceChecked on the source | Montana DLI Building Codes Bureau (Business Standards Div.) statewide; certified city/county/town programs enforce locally | Rulemaking pending2024 editions in force since Sep 26, 2026; DLI current-codes page re-read Oct 20, 2026 lists no proposed rule or pending adoption |
| Elevators | ASME A17.1-2019 (elevators) and A17.3-2017 (existing elevators), via ARM 24.301DLI page lists ASME A17.1 (2019), A17.3 (2017; the page says the rule's reference to a 2018 edition is an error) and A18.1 (2017), effective June 11, 2022. Passenger and freight elevators, escalators and moving walks in public places get an annual safety inspection; deficiencies must be corrected and a fee paid before the operating certificate issues. SourceChecked on the source | Montana DLI Building and Commercial Measurements Bureau | In forceIn force (A17.1-2019, A17.3-2017 eff. Jun 11, 2022; DLI current-codes page re-read Oct 18, 2026) |
| Boilers | ASME Boiler and Pressure Vessel Code, 2021 edition, and ASME CSD-1, 2018 edition, via ARM 24.301.710 (effective Nov 6, 2021)DLI lists ASME BPVC (2021) and CSD-1 (2018) effective Nov 6, 2021. MCA 50-74-209 (last amended 2019): yearly inspection for manually fired boilers and units of 400,000 Btu/hr or more; every two years for smaller automatic boilers, yearly in schools, day cares, hospitals, rest homes and assembly over 100. DLI may approve longer intervals. SourceChecked on the source | Montana DLI Building and Commercial Measurements Bureau | In forceIn force (ASME BPVC 2021 and CSD-1 2018 eff. Nov 6, 2021; DLI current-codes page re-read Oct 18, 2026) |
| Pools | Operation: ARM 37.115.106 adopting Circular FCS 3-2022, 2021 Int'l Swimming Pool & Spa Code and ANSI/APSP/ICC 7-2020 (effective Feb 25, 2023); construction: 2024 ISPSC under ARM 24.301 (effective Sep 26, 2026)DPHHS pool page: ARM 37.115.106 was amended to adopt Circular FCS 3-2022, the 2021 ISPSC and ANSI/APSP/ICC 7-2020, effective Feb 25, 2023; DPHHS reviews plans for public pools, spas and water features. DLI's building code package lists the 2024 ISPSC effective Sep 26, 2026. See CONFLICT note on editions. SourceChecked on the source | DPHHS and local health officers (licensing/sanitation); DLI (construction code), statewide | Rulemaking pendingNo pending DPHHS pool rule listed on the page re-read Oct 18, 2026 (ARM 37.115.106 / Circular FCS 3-2022 eff. Feb 25, 2023); DLI lists the 2024 ISPSC for construction effective Sep 26, 2026 |
| Lodging | Hotel/motel license required statewide (MCA Title 50 ch.51)MCA 50-51-201 (last amended 2011): operators of hotels, motels and similar establishments need a DPHHS license procured annually, validated by the county health officer or sanitarian; one license per establishment. Guest ranches and outfitting and guide facilities meeting 50-51-102 definitions are exempt. Fire safety for hotels falls under MCA 50-61. SourceChecked on the source | DPHHS (licensing) statewide; local health officers inspect/validate | In force |
| Workplace | Federal OSHA jurisdiction; no Montana State PlanOSHA's state-plan page lists Montana as not an OSHA-approved State Plan; federal OSHA covers it. Confirm coverage of public employers with the Montana Dept. of Labor and Industry. SourceChecked on the source | Federal OSHA, U.S. Dept. of Labor | In forceIn force; osha.gov approved State Plans page re-read Oct 21, 2026 does not list Montana |
| Environmental | Montana DEQ layer on top of federal EPA rules: UST notification within 30 days (ARM 17.56 subch. 9), asbestos project permit and demolition notice 10 working days ahead, and sewer-overflow reporting (24-hour oral, 5-day written); federal SPCC, Tier II and HFC rules also applyDEQ: UST owners notify within 30 days of a tank entering use or changing status (form rev. July 2025); aboveground tanks with underground piping are covered. Asbestos project permit (over 10 sq ft or 3 linear ft) and demolition notice 10 working days ahead. Sewer overflows: oral in 24 hours, written in 5 days. Generator air exemption not read. SourceChecked on the source | Montana Dept. of Environmental Quality (Air, Tanks/Waste, Water Protection, Asbestos Control); U.S. EPA; local utilities | In forceDEQ tank permitting page re-read Oct 19, 2026 (UST work permit 30 days ahead; 30-day change notices; no future rule change announced). Federal: HFC leak-repair rule in force since Jan 1, 2026; automatic leak detection for existing 1,500 lb+ commercial refrigeration by Jan 1, 2027 (eCFR 84.108 re-read Oct 21, 2026); next Tier II filing March 1, 2027 |
No single statewide model fire code; DOJ oversees/approves locally-adopted codes (MCA Title 50 ch.61). MCA 50-61-102 (2025 MCA, last amended 2007) puts DOJ in charge of enforcing the public-building fire-safety chapter and lets DOJ approve a city or fire agency's local inspection program after approving its fire code and enforcement plan. No fire-code edition is named in the statute; confirm the locally adopted code with the AHJ. Enforced by: Montana DOJ, Fire Prevention & Investigation Section (Div. of Criminal Investigation) statewide; DOJ-approved local fire agencies locally.
2024 IBC / IRC / Int'l Existing Building Code + 2023 NEC + 2024 Uniform Plumbing Code (ARM 24.301). DLI page lists, effective Sept 26, 2026 under ARM 24.301: 2024 IBC, IRC, IEBC, IECC, Mechanical and Fuel Gas codes, 2024 Uniform Plumbing Code, 2023 NEC, 2024 Swimming Pool and Spa Code and Wildland Urban Interface Code, with state amendments. Confirm local enforcement with the AHJ. Enforced by: Montana DLI Building Codes Bureau (Business Standards Div.) statewide; certified city/county/town programs enforce locally.
Elevators: Montana DLI Building and Commercial Measurements Bureau (ASME A17.1-2019 (elevators) and A17.3-2017 (existing elevators), via ARM 24.301). Boilers: Montana DLI Building and Commercial Measurements Bureau (ASME Boiler and Pressure Vessel Code, 2021 edition, and ASME CSD-1, 2018 edition, via ARM 24.301.710 (effective Nov 6, 2021)).
Montana is a federal-OSHA state: the U.S. Department of Labor's OSHA enforces workplace safety rules directly.
Building: Rulemaking pending (2024 editions in force since Sep 26, 2026; DLI current-codes page re-read Oct 20, 2026 lists no proposed rule or pending adoption); Pools: Rulemaking pending (No pending DPHHS pool rule listed on the page re-read Oct 18, 2026 (ARM 37.115.106 / Circular FCS 3-2022 eff. Feb 25, 2023); DLI lists the 2024 ISPSC for constr); Jan 1, 2027: Automatic leak detection on existing 1,500 lb+ HFC commercial refrigeration; Mar 1, 2027: EPCRA Tier II chemical inventory filing.
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