Rhode Island's New Rat Poison Law Has a Three-Stage Countdown

Rhode Island's General Assembly passed legislation (S 2795 / H 7222) restricting anticoagulant rodenticides on June 8, 2026, and Governor Daniel McKee signed it into law later that month. Rather than taking effect all at once, the law is structured around a three-stage countdown running from 2027 through 2029 — a phased approach meant to give both consumers and the pest control industry time to transition away from the chemicals being restricted.

The three dates that actually matter

The law's timeline works in stages, each targeting a different group of chemicals or users. Starting March 1, 2027, consumer sales of first-generation anticoagulant rodenticides — warfarin, chlorophacinone, and diphacinone — are prohibited in Rhode Island. Starting January 1, 2028, consumer sales of second-generation anticoagulants — brodifacoum, bromadiolone, difenacoum, and difethialone — are banned as well, codifying into law a restriction that already limited those products largely to licensed pest control professionals. Finally, starting January 1, 2029, the law prohibits use of both generations of anticoagulant rodenticides statewide, including by licensed pest control companies — with limited exemptions carved out for specific situations like protecting a drinking water supply or eradicating an invasive rodent species, along with uses tied to public health, agriculture, and food production.

Why the two generations are treated so differently

The distinction between first- and second-generation anticoagulants is central to why this law exists at all. First-generation anticoagulants typically require a rodent to feed on the bait multiple times before a lethal dose accumulates. Second-generation anticoagulants are considerably more potent and can be lethal after a single feeding. Both types work by preventing blood clotting, but that mechanism creates a specific secondary risk: a poisoned rodent that hasn't died yet can still be caught and eaten by a predator, passing a dose of the anticoagulant up the food chain to whatever animal ate it.

The case made by the bill's sponsors

The legislation was sponsored by Senate Health and Human Services Committee Chairwoman Melissa Murray and Representative Rebecca Kislak. Murray argued the products cause significant harm to raptors and other wildlife, in addition to posing a risk to children and pets who might encounter bait directly. Kislak specifically framed the harm as disproportionately affecting raptors like owls and hawks, and paired the phase-out with a provision establishing a municipal pilot program for integrated pest management alternatives. Advocacy for the bill was led by the Audubon Society of Rhode Island, and testimony supporting it included an account from a licensed wildlife rehabilitator describing a bald eagle that died with a large amount of anticoagulant rodenticide detected in its liver — the kind of secondary poisoning case the law is specifically designed to reduce going forward.

Not Rhode Island's first attempt

An earlier version of this legislation had passed the Rhode Island Senate in 2025 but died in a House committee before becoming law, meaning the 2026 session marked the second legislative attempt at this specific restriction. According to the Audubon Society of Rhode Island, the state becomes the second in the nation to pass this type of anticoagulant rodenticide restriction, following a similar framework already enacted elsewhere — though the exact national count of comparable state laws continues to shift as more states take up similar bills.

• Rhode Island's rodenticide law (S 2795 / H 7222) passed the General Assembly June 8, 2026 and was signed by Gov. Daniel McKee later that month.
• Stage one (March 1, 2027): consumer sales of first-generation anticoagulants (warfarin, chlorophacinone, diphacinone) are banned.
• Stage two (January 1, 2028): consumer sales of second-generation anticoagulants (brodifacoum, bromadiolone, difenacoum, difethialone) are banned.
• Stage three (January 1, 2029): statewide use of both generations is prohibited, including by licensed pest control companies, with limited public-health, agricultural, and invasive-species exemptions.
• First-generation anticoagulants require multiple feedings to kill; second-generation versions can be lethal after a single feeding — both create a secondary-poisoning risk for predators that eat affected rodents.
• An earlier 2025 version of the bill passed the Senate but died in a House committee before this year's successful second attempt.
• The law also establishes a municipal pilot program for integrated pest management alternatives.

Rodenticide regulation is shifting state by state, and the underlying lesson applies everywhere regardless of local law: bait alone, especially anticoagulant bait, treats symptoms rather than the entry points and attractants that actually sustain a rodent population. A free Sevacorp inspection can help identify what's drawing rodents to a property in the first place.

• Sources:
• Rhode Island Current — "Rat poison ban clears both chambers of RI General Assembly" — https://rhodeislandcurrent.com/2026/06/04/rat-poison-ban-clears-both-chambers-of-ri-general-assembly/
• Rhode Island General Assembly — Press release on rodenticide legislation signing — https://www.rilegislature.gov/pressrelease/Lists/PressReleases/DispForm.aspx?ID=376833
• Rhode Island General Assembly — Senate Environment and Agriculture Committee testimony (S2795) — https://www.rilegislature.gov/senators/SenateComDocs/2026%20Environment%20and%20Agriculture/S2795%20Kenda%20Swartz.pdf
• Audubon Society of Rhode Island — "Protecting Raptors by Banning Rat Poisons" — https://asri.org/ban-rat-poison/