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H 4972

An Act a petition that the town of Chelmsford be authorized to ban second generation anticoagulant rodenticides within said town

194th Legislature (2025-2026) Introduced by Simon Cataldo and 1 co-sponsor

Chelmsford, MA gains authority to ban second-generation anticoagulant rodenticides to reduce predator poisoning and ecological harm from rat control practices.

Accompanied a new draft, see H5217
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Bill Summary · H 4972

Legislative bill overview

H 4972 permits the town of Chelmsford, Massachusetts to independently ban second-generation anticoagulant rodenticides (SGARs) within its municipal boundaries. Second-generation anticoagulants are potent rat and mouse poisons that work by preventing blood clotting. This local authorization bill would allow Chelmsford to establish stricter rodent control standards than state law currently permits.

Why is this important

SGARs persist in the environment and accumulate in predator animals like raptors, foxes, and owls that consume poisoned rodents, causing secondary poisoning and population declines in non-target species. Allowing municipalities to ban these substances addresses growing concerns about ecological harm while respecting local decision-making authority. The bill reflects a broader environmental and public health trend toward restricting highly toxic pesticides.

Potential points of contention

  • Pest control effectiveness: Restricting SGARs may limit effective rodent management options for residents and businesses, potentially allowing rat populations to grow unchecked in urban/suburban areas
  • Economic burden: A ban could increase costs for pest control services that must use less effective alternatives or shift to first-generation anticoagulants with different ecological tradeoffs
  • Regulatory fragmentation: Allowing individual towns to ban pesticides creates a patchwork of rules that may complicate compliance for pest control companies operating across multiple jurisdictions

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

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