Kaipara District Council has filed legal proceedings against former chief executive Jack McKerchar and the Auditor General over the controversial Mangawhai Community Wastewater Scheme that ended up costing ratepayers about $57 million.
In August commissioners running the council voted to pursue Mr McKerchar through the courts for his handling of the "botched" system around the process that was initially estimated to cost $10.8 million.
Kaipara chairman of commissioners John Robertson confirmed papers were filed about a week before Christmas against Mr McKerchar in the Employment Relations' Authority and against Auditor General Lyn Provost in the High Court.
He refused to discuss the cases as they were before the courts.
It's understood the case against Ms Provost may relate to her earlier admission of poor work done by the Audit Office when scrutinising the council books.