His resignation took effect immediately, he said yesterday. Mr Millis (56) was in his first term as one of the five elected members of the board, representing the Earnscleugh-Manuherikia ward.
When contacted by the Otago Daily Times, Mr Millis agreed he was "disillusioned'' about local government and was unlikely to stand again.
He served a term as district councillor in the early 2000s. He emailed his decision yesterday afternoon to district mayor Tony Lepper, board chairwoman Clair Higginson, community board members and council staff and listed nine points of concern, each relating to a different topic.
Asked for his comment on Mr Millis' resignation and allegations, Mr Lepper said: "Politics is all about being able to achieve things through majority decisions and that's the way boards of companies work too. Mr Millis hasn't been able to achieve what he wanted to and he's disillusioned and disheartened.''
He said the concerns Mr Millis listed were "baseless, unfounded and unimaginable''.
Ms Higginson said she had responded to the emailed resignation by saying everyone interpreted situations "through their own lenses''.
"I would say the board members and I have become quite frustrated with Stu's negative and judgemental way of working. The local government process is dependent on the community, the council staff and elected members all working productively together,'' Ms Higginson said.
In his email, Mr Millis said Mr Lepper and Ms Higginson "discouraged development'' in the Vincent area.
He said they had a "predetermined outcome'' in mind for the area which did not follow the district plan.
When interviewed, he said the community board was "stacked'' and the majority were "of the same ilk'' as Ms Higginson, with green leanings.
"They're all yes-men ... and I've had enough.''
Several issues had brought things to a head and Mr Millis said the board was making decisions without having the right information from council staff.
He was not blaming the staff and said Mr Lepper and Ms Higginson were "the problem''.
As it was close to the local government election, on October 8, he thought there would not be a byelection and so ratepayers would not incur any costs by his resignation.
