"It's because of my work commitments," he said. "I've a fulltime job and council meetings are during the day time, so I have a conflict of time."
Mr Keltie is not seeking re-election, saying it was time for some new blood.
"Council needs someone a bit younger," he said.
Mr Keltie has served four terms on the district council and admits he'll miss the role.
"Shivers, yes, I'll miss it, although the last three years have been hard," he said.
"We've had the Infracon saga and I wanted to see all the water upgrades completed.
"One of the main reasons I got on to council was to see the upgrade of the Pahiatua Track, like councillors before me. However, that's an ongoing saga too."