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HB 4639

Civil procedure: statute of limitations; accrual of cause of action for groundwater contamination cases; revise. Amends 1961 PA 236 (MCL 600.101 & 600.9947) by adding sec. 5830.

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

Michigan bill extends groundwater contamination lawsuit deadlines from pollution discovery to reasonable-discovery standard, enabling delayed claims against responsible parties.

bill electronically reproduced 06/10/2025
#civilprocedure:statuteoflimitations #environmentalprotection:groundwatercontamination
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Bill Summary · HB 4639

Legislative bill overview

HB 4639 amends Michigan's civil procedure laws to modify the statute of limitations for groundwater contamination lawsuits by changing when the legal claim is considered to have "accrued" (begun). Instead of the statute starting when contamination occurs, it would likely begin when the contamination is discovered or should reasonably have been discovered by the affected party.

Why is this important

Groundwater contamination often goes undetected for years or decades, meaning property owners or communities could lose their legal right to sue under current law before they even know damage occurred. This change would give affected parties more time to pursue claims against responsible parties for cleanup costs and health-related damages.

Potential points of contention

  • Liability exposure: Businesses and property owners responsible for contamination could face lawsuits decades after incidents occurred, potentially for closed operations or under previous ownership
  • Insurance implications: Insurers may face unexpected claims on old policies, affecting coverage costs and availability
  • Remediation burden: Extending liability timeframes could create financial uncertainty for property developers and industrial operators, potentially affecting land development and economic activity

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

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