Idaho Lawmakers Advance 'Rodents of Unusual Size Act' to Address Growing Rat Problem

The bill directs the state Department of Agriculture to coordinate with local stakeholders to develop a plan to combat the issue.

Published on Mar. 5, 2026

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The Idaho Senate has passed a bill known as the "Rodents of Unusual Size Act" by a vote of 28-3, sending it to the House. The bill aims to address a growing rat problem in the Treasure Valley region by declaring Norway Rats a public health and safety nuisance and directing the state Department of Agriculture to identify the scope of the issue and work with local stakeholders to develop a plan.

Why it matters

The rat infestation has become a growing concern in the Treasure Valley, impacting housing, irrigation systems, and agricultural infrastructure. The bill seeks to provide a coordinated state-level response to the problem after local businesses have struggled to address it on their own.

The details

The amended version of the bill narrows the state's authority, removes summary abatement language, strengthens legislative oversight, and protects cities and counties from mandatory participation or spending. The bill's sponsor, Rep. Tammy Nichols, explained that the approach is meant to prevent the spread of Norway Rats, as seen in places like Calgary, Alberta, rather than immediately moving to enforcement.

  • The Treasure Valley has been facing a growing rat problem for some time.
  • The "Rodents of Unusual Size Act" was passed by the Idaho Senate on March 5, 2026.
  • The bill now moves to the Idaho House for consideration.

The players

Rep. Tammy Nichols

The sponsor of the "Rodents of Unusual Size Act" and a Republican representing District 10 in the Idaho House of Representatives.

Sen. Todd Lakey

A Republican senator representing District 23 in the Idaho Senate, who voiced his support for the bill.

Sen. Josh Kohl

A Republican senator representing District 25 in the Idaho Senate, who expressed concerns that the bill would be an act of state government overreach.

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What they’re saying

“The amended version narrows authority, removes summary abatement language, strengthens legislative oversight, and clearly protects cities and counties from mandatory participation or spending.”

— Rep. Tammy Nichols, Bill Sponsor (kivitv.com)

“So instead of storming the castle straight to enforcement, the bill requires the Department of Agriculture to first determine the scope of the issue, coordinate with the cities and counties and other stakeholders, and develop a plan.”

— Rep. Tammy Nichols, Bill Sponsor (kivitv.com)

What’s next

The "Rodents of Unusual Size Act" will now be considered by the Idaho House of Representatives, where it will need to pass before being signed into law by the governor.

The takeaway

The growing rat problem in the Treasure Valley has prompted state lawmakers to take action, with the "Rodents of Unusual Size Act" aiming to provide a coordinated, state-level response that involves local stakeholders. The bill's passage in the Senate suggests recognition of the issue, but concerns remain about the potential for government overreach.