When asked why the council had made such a decision, CHB Mayor Peter Butler said: "I can't answer that."
His chief executive John Freeman, who was with the mayor at the time of the interview, said the CHBDC audit committee was looking into whether a register should be started up again.
"We did look at it but it got a bit messy when we looked at it," he said.
"Because a number of the councillors in the past were in positions in their employment as lawyers or accountants where they were trustees on a whole pile of family trusts or company trusts."
Mr Freeman said it was because of that it started to get really messy as to what constituted a conflict of interest and what did not under the Local Authorities (Members' Interests) Act 1968.
He said Local Government New Zealand (LGNZ) has advised that the council does not need a register, but councillors do have to formally declare any CoIs at the start of each meeting.
"From our point of view, small community elected members are involved in a number of organisations, committees and groups," he said.
"So each election it is decided whether to have a CoI register or not.
With the recent changes to the act, our audit committee are looking how we can have a risk registrar and a CoI registrar in a way that is useful," he said.