Mr Piper said Origin CEO Frank Calabria should not "escape criticism".
"Origin had forecast to me some months earlier that they may need to look at relocating the tennis courts and swimming pool, but there was no indication that the so called 'nuclear option' was on the table," he said.
"Indeed, there was no further contact with my office ... no contact with Lake Macquarie City Council ... no contact with Roads and Maritime services ... no discussion with the Eraring power station community consultative committee ... and no reference to anyone about the devastation that would be done to the lake itself if such a loss of ash occurred.
"The recreation centre was identified as a risk during the acquisition process," she said.
"Treasury approached the department of sport with an offer to buy [Myuna Bay centre], however the Office of Sport did not agree.
"The reality is, when Origin purchased this site, they always wanted the sport and recreation camp.
"They in fact, at the time of purchase, got Treasury to approach the Office of Sport to buy it."
Ms Voltz said there was a "huge range of skepticism" given the Office of Sport "had independently taken a decision" to close the centre "without any referral to the actual government agency that is empowered to ask questions, and by law to receive answers ... and decide on the safety of this dam."
Greg Piper has been an independent voice for the people of Lake Macquarie for more than 20 years, as a Member of Parliament, Mayor and councillor. He was elected to Lake Macquarie council in 1991, served as Mayor from 2004 until 2012 and has been the State MP for Lake Macquarie since 2007.