"A rubber diaphragm burst and while demand for water was low we turned the bore off and replaced that part.
"We took the opportunity while it was raining to make a new part," he said, adding that it was a small modification and not a significant extra cost to the $800,000 that had been spent to recommission the bore.
The extra work at the bore comes on top of other challenges to the water network in the last few months including leaks and burst water mains.
Mr Yule said the leaks were connected to the chlorine that had been added to the system following last August's campylobacter contamination of Havelock North's water supply, but that the cause of recent burst water pipes was not so clear cut.
Last month, a burst mains pipe ripped open part of Karamu Rd and flooded an arts classroom space as well as Humanity Books and Fine Art Supplies in the Hastings central business district.
This month, two games into the Vantage Hawke's Bay Cup, the first Black Sticks game was suspended seconds before half time due to a burst water main at the Hawke's Bay Regional Sports Park.
Mr Yule said there was still no answer as to what caused the problem at the art supplies shop, but that the sports park flood resulted from the addition of a new plastic pipe that was believed to be damaged.
He said the chlorination of the water supply had nothing to do with the mains pipes bursting, and nor was it a result of water pressure.
With the water having to travel further from the Heretaunga Plains to get to Havelock North as a result of decommissioning Brookvale bores 1 and 2 there had been speculation the water pressure would have increased to help it travel the extra distance.
Mr Yule said the water pressure was no different than it had always been.
"The water pressure in Hastings is higher than you see in other parts of New Zealand and water pressure reducing valves have been installed around the network.
"That [the water pressure] hasn't changed."