Just two votes have secured Kirsty MacGregor a place on the Mid Murray Council.
The incredibly narrow margin allowed the garden maintenance business owner to squeeze past former council executive Robin Bourne in an election in the council's Shearer ward, centred on Mannum, when votes were counted last week.
The new councillor, who will start in August, said she looked forward to the challenge.
"Ensuring a strong and vibrant local business economy, as well as responsible tourism, have both long been passions of mine," she said.
"Taking on a leadership role within the council seemed like the logical next step.
"I'm looking forward to working with the council to understand (the) policies and processes of local government, and then, of course, working alongside the existing elected members to help make sound decisions that ensure a strong future for Mid Murray residents."
Almost 1100 people, or 35 per cent of those eligible, voted in the election.
Mr Bourne received the most first-preference votes, with 429, but Ms MacGregor started only seven votes behind before preferences were distributed.
The election was required to fill a vacancy on the council following the death of former Councillor Steve Wilkinson in April.