The Havelock North water crisis has been struck by new revelations - two other bores are contaminated.
And the bore causing the gastro outbreak has been contaminated before.
The Hawke's Bay Regional Council is threatening legal action against the district council.
The Brookvale Road water bore is the source of Havelock's water contamination.
And now it's the source of war between two Councils, with the Regional Council accusing the Hastings District of withholding information.
"We are concerned that we have not been given the full suite of information that we might've been expected to receive," interim chief executive Liz Lambert says.
The Regional Council went public with its concerns today, saying: "The source of the contamination may relate to the security of the water supply bores".
"This additional evidence was known to Hastings District Council six days ago but they failed to bring it to our attention."
It has announced a formal investigation.
It's now been revealed the Portsmouth Rd and Wilson Rd bores now have unsafe water.
The Regional Council also says the bore has a history of contamination - in 2013 and 2015.
"There have been some previous contamination incidences that have been investigated by Hastings District Council," Ms Lambert says.
Just over 4500 people have been ill with gastroenteritis over the past two weeks as a result of campylobacter in the Havelock North water bore.
Ms Lambert says there's no indication someone intentionally polluted the water supply.
She says the new information confirmed the regional council could not delay formal investigations any longer.
Local MP, National's Craig Foss says when he was "flabbergasted" by the news of the investigation.
The Regional Council is responsible for managing freshwater resources, but it says under the Health Act, the Hastings District Council is the water supplier and responsible for identifying risks.
The Regional Council threatening to take action under the Resource Management Act.
Under the Act, the Regional Council get could get what's called an "enforcement order" against the District Council.
This could see the Regional Council take control of the water supply, or require the District Council to pay money for costs incurred by the contamination.
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