Hawke's Bay Regional Council has today advised Hastings District Council of the commencement of a formal investigation into the condition of the Havelock North water supply bores as a source of contamination.

A statement today said investigations since the event began into the source of contamination have increasingly indicated that the source of the contamination may relate to the security of the water supply bores.

A regional council spokesperson said "yesterday we began preparation of a letter to Hastings District Council advising them of this but, last night, we received additional information which confirmed to us that we could not delay formal investigations any longer.

"This additional evidence was known to Hastings District Council six days ago but they failed to bring it to our attention."

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This information and HBRC's associated actions will also be shared with Hawke's Bay District Health Board to enable the DHB to decide what actions to take under the Health Act.