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HB 4640

Environmental protection: cleanups; cleanup standards; require. Amends secs. 20101, 20107a, 20112a, 20114, 20114b, 20114c, 20114d, 20114e, 20119, 20126, 20126a, 20137 & 20139 of 1994 PA 451 (MCL 324.20101 et seq.); adds secs. 20113a & 20139a & repeals secs. 20114a & 20114g of 1994 PA 451 (MCL 324.20114a & 324.20114g). TIE BAR WITH: HB 4638'25, HB 4636'25

2025-2026 Regular Session Introduced by Noah Arbit and 23 co-sponsors

HB 4640 restructures Michigan's contaminated site cleanup standards and liability procedures, potentially affecting remediation timelines, costs, and environmental protection adequacy.

bill electronically reproduced 06/10/2025
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Bill Summary · HB 4640

Legislative bill overview

HB 4640 amends Michigan's Environmental Contamination Liability Act (1994 PA 451) to modify cleanup standards and requirements for contaminated sites. The bill restructures provisions governing environmental remediation procedures, liability frameworks, and cleanup benchmarks across multiple sections of existing law.

Why is this important

Contaminated site cleanup standards directly affect property values, public health exposure, and the pace at which brownfields can be redeveloped. Changes to these standards influence costs for responsible parties, timeline expectations for municipalities, and what constitutes an acceptable end-state for remediation—affecting both environmental protection and economic development.

Potential points of contention

  • Cleanup standard rigor: Whether amended standards maintain adequate environmental protection or reduce requirements in ways that affect long-term public health and groundwater safety
  • Cost allocation: How revisions affect liability distribution between current property owners, historical polluters, and public entities, potentially shifting financial burdens
  • Implementation timeline: Changes to cleanup procedures and approval processes may accelerate or delay site remediation, affecting community concerns about lingering contamination
  • Tied legislation: This bill's tie-bar relationship with HB 4638 and HB 4636 means its actual impact depends on coordinated passage of companion bills with potentially overlapping or conflicting provisions

Compiled from official sources — confirm details with the bill’s official record.

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