Idahoans left to deal with rat problem in the Treasure Valley for another year

What began as a handful of calls from Treasure Valley residents has grown into a rat problem that is exposing gaps in Idaho law and leaving homeowners to handle infestations largely on their own for at least another year.

Rats have been reported in the Treasure Valley since 2022, when Eagle residents started spotting Norway rats and roof rats in yards, under decks and near canals. Residents have also shared videos showing the rodents in their neighborhoods.

As the reports mounted, it became clear that no agency in Idaho is legally responsible for dealing with rats. The issue traces back to an 1868 legal doctrine known as Dillon’s Rule, which limits Idaho cities and counties to powers specifically granted by the state. Because rats are not mentioned in state law, local governments have no authority to act and no funding to do so.

During this legislative session, state lawmakers tried to change that. Senate Bill 1271 would have directed the Idaho Department of Agriculture to map infestations and coordinate a response across the Treasure Valley. The bill passed the Senate but later died in the House, with opponents arguing it was a local problem, not a state one.

The Idaho Department of Health and Welfare says rats can spread diseases such as Plague and Salmonella through droppings, urine and bites.

With the Legislature out of session until next year, Sen. Nichols and Rep. John Gannon are pushing for action without waiting for a change in state law. This week, they sent a letter to local officials across the Treasure Valley urging cities, counties, irrigation districts and parks agencies to each designate a point person to help coordinate a response now.

The letter describes the situation as a public health, safety and property concern and warns that a coordinated effort now would be far less costly than a crisis later.

In the meantime, residents are being urged to seal vents, secure trash and call an exterminator if they see signs of rats. Nichols has said she fears that when lawmakers return next January, the problem will be harder and more expensive to solve.