"We don't have a full council meeting until later in the month," he said.
"It is not something for me to decide on my own. And,if I were to sign a letter, I would want to do so with council support."
Whanganui mayor Hamish McDouall is also vice-president of the Local Government New Zealand (LGNZ) national council, and said his communications with the Government would be through LGNZ.
"Although I support and agree with many of the concerns expressed in Mayor Gordon's letter, it's not something I would be signing," he said.
"I think the letter has a haranguing element to it, and I believe we can address things in a more constructive way through LGNZ."
Ruapehu mayor Don Cameron, who is also an elected member of the LGNZ national council, said he would also address his council's concerns through that forum.
"As a rural council, we support the reforms," he said.
"By July 2024, our water infrastructure will be seriously in need of upgrades. It's simply unaffordable for our ratepayers."
Cameron said that did not mean he didn't have concerns and questions for the Government.
"LGNZ has worked very hard on behalf of councils. I know some have said we should have pushed harder but we really tried to persuade the Government to listen harder to councils' concerns."