HELENA, Mont. (AP) – The former head of the Chippewa Cree Tribe’s water department is going to trial over allegations that he lied to federal authorities investigating a contaminated drinking water tank.

Jonathan Jay Eagleman has pleaded not guilty to making false statements to a federal agency. He demanded a jury trial, which is scheduled to get underway Monday.

Federal prosecutors say a tribal water department employee found wooden boards, concrete and animal feces had been thrown into the tank on Aug. 30, 2012.

The department did not notify the U.S. Environmental Protection Agency, as is required whenever a drinking water source is compromised. The tank was shut down, but the existing water remained in the system for nearly a month.

Prosecutors say Eagleman lied by telling EPA officials that the break-in was only discovered on Sept. 24.