He said the government inquiry into Havelock North had been highly critical of the regional council.
"The inquiry found the council failed to act properly as guardians of the Heretaunga Plains water aquifer, issuing water consents with inadequate conditions and failing to appropriately monitor them.
"Their knowledge and awareness of contamination risks was found to fall well below expected standards."
Guerin grew up in Hawke's Bay and returned in 2015, after a career in local government and business, including leading the Rotorua District Council as chief executive.
He said he believes he could make a genuine difference if elected to Hawke's Bay Regional Council.
"The three current Hastings Ward regional councillors have all held office for the last six years.
"Residents should think carefully about whether they have been well served by these people."