"The water used on the farm is sourced from our own bore," said the company, which was unsure if its water came from the same Te Mata Aquifer as sourced by the council.
"Water samples from this bore have been independently tested and have returned a zero E. coli count - meaning that the water we use is safe for consumption and for use in a horticultural environment."
It said while initial tests did not look for campylobacter, the plant's bore was resampled on Tuesday, and is being tested for both E. coli and campylobacter, the company said.
But it wasn't a defensive stance from Mr Whitaker, who said the company has opened "every square metre" of the site to those looking for the source of the bugs that infiltrated the supply from the council bores and is "co-operating in every way," in its own concern for the community of which the mushroom farm has been a part for almost 50 years.
It has been reported to use chicken manure in its operation, but Hastings Mayor Lawrence Yule has warned against any conjecture, which Mr Whitaker says is "irresponsible", while the authorities are dealing with the public health emergency that erupted with a wave of absences from schools in Havelock North late last week.
"I'd be very careful that there is no finger-pointing going-on," Mr Yule said, at one of the daily media conferences.
Mr Whitaker said: "I don't think it's time for conjecture. It is important that facts come before fiction, and it will be what it is."
Hawke's Bay Regional Council group manager of resource management Iain Maxwell said the council's environmental science team had been undertaking extensive testing of the Te Mata Aquifer to understand its water quality and to help the district council and Hawke's Bay District Health Board in determining the source of the contamination. Staff had been active since Monday this week testing a range of bores across the aquifer to understand whether "this issue" is localised or wider spread.
"We want to understand the condition of our aquifer and to start to build a picture of the source of the contamination so we can fix the issue," Mr Maxwell said.