But PSA national secretary Brenda Pilott said staff were angry they were paying for other people's mistakes.
"The consequences are being felt by the average staff member who had nothing to do with those things."
Ms Pilott said she had met Mr Harris before Christmas to raise members' concerns about the culture at the council and low staff morale after public scrutiny of the council and the intervention of the former Local Government Minister and had been reassured he was addressing the matter.
Last year 165 staff left compared with 151 departures the year before, according to information the Herald obtained under the Official Information Act.
A staff member who spoke on the condition of anonymity said staff felt betrayed. "Staff are really, really gutted and disillusioned ... particularly [at the decision] being made without consultation with staff."
The PSA said staff were further exasperated by learning Mr Harris' performance bonus was protected because it was built into his $360,000 pay package.
Mr Harris declined to speak last night but a council spokeswoman reiterated a message sent to staff expressing regret at the action.