While Hastings Mayor Lawrence Yule had no comment on the letter, he did agree with Mr Dalton on one point. "The NZCID proposal gives too much power to the mayor," he said.
The Napier mayor was direct in his assessment of the overall report. It was "seriously flawed".
"NZCID's recommended approach is clearly in their best interests," his letter reads.
"They want big infrastructure projects to finance."
Mr Yule said the report was "a significant think-piece".
NZCID chief executive Stephen Selwood disagreed that his body's proposal for local government reorganisation gave the mayor too much power.
"The purpose of local democracy is for the communities to very clearly voice their expectations and set literally the expectations of the community in terms of service and quality," he said. "The only difference is the proposal that the mayor would appoint the CEs of any CCOs." It was quite a detailed point in a very macro context that clearly was open for debate.
"It is not unusual for the mayor to set up an appointments committee which would comprise of other councillors, and that committee makes a decision on the appointment of CEs or CCO appointments," he countered.
Mr Yule pointed out that the mayor currently has the ability to appoint the deputy mayor and committee chairs - a provision introduced in 2012. "It is a rarely used power as most, including myself, prefer this to be a council position," he said. "I disagree that the mayor should appoint the CEO and CCO members."
Furthermore, Mr Yule said the Indicative Council Management Structure (see graphic) was a straight business model and had limited regard for democracy.
Mr Dalton claimed that the NZCID wanted councils run through council controlled organisations. Despite their name, those organisations were simply not controlled by councils. "They are run very much like private companies, with an independent board and staff.
"Where does this leave councillors? Where does this leave democracy? Where does this leave the community? " he asked.
Local Government Minister Paula Bennett said she would legislate where necessary to enable greater use of CCOs to promote better integration of services, lift regional economies and provide more jobs.
A move Mr Yule supported, as CCOs are "a very good way of bringing independent technical expertise to the governance of major infrastructure".
Mr Dalton told the mayors and chairs that the Government needed to know the path they were going down was the wrong one. "We must tell them we value democracy and our sense of community. We must tell them their proposed erosion of those two values is unacceptable. If we fail to act, we will be remembered as those who sold democracy out to the highest bidder."