Creates new GS 143B-279.30 (Limitation on regulation of environmental matters by units of local government), prohibiting a local government from enacting, adopting, implementing, or enforcing an environmental or natural resources regulation with a more restrictive standard or limitation than those imposed by state or federal law, unless authorized by the General Assembly. Provides an exception for regulations necessary to comply with state and federal law, or conditions of permits and approvals from federal and state agencies. Also makes an exception for local government regulations adopted as a condition of the National Flood Insurance Program.

Requires each local government to review its ordinances and regulations and amend as necessary to ensure compliance with the new statute, and makes any non-compliant provisions in effect after December 1, 2025, null and void.