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Montana Statewide Rule

Montana Auxiliary Container Preemption Law

Some RestrictionsApplies statewide across Montana (2026)

Key Facts

Codified at
MCA 7-1-121
Enacted
2021 (HB 407)
Covers
Bags, cups, bottles, boxes, cans
Preempts
Local bans and fees
Conflicting ordinances
Unenforceable
Last verified: September 5, 2026Source: Montana Legislature

Summary

Montana enacted MCA 7-1-121 in 2021 (HB 407), preempting local governments from regulating, banning, or imposing fees on plastic bags and other auxiliary containers.

(1) The purpose of this section is to preempt any local ordinance, resolution, initiative, or referendum regulating the use, disposition, sale, prohibitions, fees, charges, or taxes on certain containers. (2) Except as provided in subsection (3), a local unit of government may not adopt or enforce any local ordinance, resolution, initiative, or referendum that: (a) regulates the use, disposition, or sale of auxiliary containers; (b) prohibits or restricts auxiliary containers; or (c) imposes a fee, charge, or tax on auxiliary containers.

Source: Montana LegislatureView official code

Full Breakdown

MCA 7-1-121 prohibits counties, cities, towns, and consolidated local governments from adopting ordinances that regulate the use, sale, or disposition of auxiliary containers, including plastic bags, paper bags, boxes, cups, bottles, cans, and similar packaging of any material. Enacted by HB 407 in the 2021 session for statewide uniformity, the law preempts local bag bans and container fees and protects retailers from a patchwork of local rules. Any conflicting local ordinance is void.

Violations & Penalties

Local ordinances that regulate or tax auxiliary containers are void under MCA 7-1-121; aggrieved parties may seek declaratory or injunctive relief.

Frequently Asked Questions

Can a Montana city ban plastic bags?
No. MCA 7-1-121 preempts local plastic-bag bans and fees on auxiliary containers.
Does the law cover paper bags too?
Yes. The statute defines auxiliary containers broadly, including paper bags, cups, bottles, boxes, and cans.

Sources

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