With the mayor of Cranbrook retiring, the 56 year old Stetski stood for election to replace him in the
2008 local government election. With 46% of the vote, he lost to Cranbrook councillor Scott Manjak. Stetski became a board member with the local United Way and the vice-president of the Citizens for a Livable Cranbrook Society during its opposition to urban expansion on the land across the Cranbrook Community Forest. In 2011, with Manjak opting not to seek re-election, Stetski again ran for mayor. This time, he won the election with 45% of the vote. As mayor, he was also appointed to the board of the
Regional District of East Kootenay and the Columbia River Treaty Government's Committee. He stood for re-election in 2014 but lost, along with all other Cranbrook incumbents, with 38% of the vote. The 62 year old Stetski quickly rebounded by being acclaimed, in March 2015, the NDP nominee for the Kootenay—Columbia riding in the upcoming October 2015 federal election. Though incumbent the Member of Parliament,
David Wilks of the
Conservative Party, was seeking re-election, polling found the riding too close to call with both Wilks and Stetski polling at 37% among decided voters. Stetski did go on to win the election with 37% of the vote but his NDP was reduced to third party status to a Liberal Party majority. During the
42nd Canadian Parliament Stetski was the NDP critic for National Parks issues and sponsored two private member bills. On June 1, 2016, he introduced Bill C-281, titled the National Local Food Day Act, which sought to make the Friday before Thanksgiving Day is to be known as "National Local Food Day". The bill was passed by the House of Commons on November 8, 2018, but was blocked by the Conservative Party in the Senate. His second private member bill, Bill C-385, sought to re-insert numerous lakes and rivers such as
Trout Lake,
Duncan Lake,
Windermere Lake,
Columbia Lake,
Kicking Horse River,
Elk River, and
Salmo River back into the Navigable Waters Protection Act. However, Bill C-385 did not advance past first reading as the government bill C-69 was amending the same act to re-define what water bodies and watercourses are deemed to be reviewable as navigable waters. Stetski was seeking re-election as the
Kootenay—Columbia member of parliament in the
October 2019 federal election. He was defeated by retired law enforcement administrator Rob Morrison of the Conservative Party, and was contested by retired forester Rick Stewart for the People's Party, advocate Trev Miller for the Animal Protection Party and Nelson residents Abra Brynne for the Green Party and Terry Tiessen for the Libertarian Party. Stetski's last day in office was October 21, 2019. In 2022 Stetski was elected as a Cranbrook, BC City Councillor for a four-year term. ==Electoral record==