"I found myself sitting at home every once in a while working through training programmes, season plans and that sort of thing, so I thought okay it is about time to go back and see what's available."
During his time away from swimming, he has kept close tabs on the swimmers he first worked with who have reached international levels, like Tem Strickland, Hamish Miller and Daniel Barron.
"Just seeing all those kids progress through the years is absolutely incredible."
The Omanu opportunity was too good to ignore.
"A swim programme that can be nurtured and grown from the very grassroots through to something I think can be potentially another powerhouse in Tauranga," he said.
"There is an incredible amount of lane space at the pool based at Mount College. There are six lanes in a 33m pool and we have full use of the pool.
"The programme is open for everyone in the community. The surf club gets priority for their athletes and I will ensure that they are fit enough to do the work."
Omanu Swim Club directors Scott Bartlett and Trish Mau are thrilled to have a coach of Swanepoel's standing on board.
"The Omanu Swim Club was developed in 2014 and we needed a head coach to develop some stability in our programme and a long-term programme," Bartlett said.
"Stefan was the most suitably qualified person we had by a long way. We found that Stefan would allow us to build a really good programme to provide Tauranga with another outlet where kids can compete and then come to the beach and become trained lifeguards."
Mau says the enthusiasm coming from the swimming community about Swanepoel's appointment has been great.
"We have had people who previously swam with Stefan going 'yahoo, Stefan's back and we want in'," she said.
"So that is really exciting to see that building already.
"The club has been serving its purpose of giving the Omanu surf kids a place to train and also another outlet for the community to get fit for summer and get water safe.
"Now with Stefan along there is huge room for potential growth."
Information: info@omanuswimclub.co.nz