The bacteria causes Legionnaire's disease, a type of severe pneumonia.
Benjamin Chan, right, sits as part of a panel of state health officials in Hampton, N.H., in August after the discovery of several cases of Legionnaire's disease.
At least a dozen people were sickened from the disease; one elderly person died.
The Centers for Disease Control is assisting state health officials in confirming the source of the outbreak. The majority of cases stayed or resided in the Ashworth Avenue area, between Island Path and M Street, but may have had other exposures in the area.
Officials believe the current overall health risk to the community is low.
The illness, caused by the Legionella bacteria, can lead to pneumonia in people who are at higher risk of getting sick.
"Federal, state and local authorities are working cooperatively and diligently to address this situation and help mitigate any additional health risks", Gov. Chris Sununu said Thursday.
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Legionnaires' disease can not be spread from person to person.
"In our opinion, the CDC did not let the water run long enough to get a proper reading", the statement read, pointing out that the bacteria is killed in water over 110 degrees, a level staff were able to reach after running water "3-4 minutes".
Fraser Health doesn't say how many people are affected, but says it is looking into the source of a cluster of cases in Surrey's Guildford neighbourhood.
The disease can not be spread through person-to-person contact, nor by drinking contaminated water.
In Nashua, one of the disease victims was afflicted out of state, officials said.
"When a report comes in, we have a protocol that we follow which includes interviewing with the person that is ill or was sick and ask them a series of questions to determine where the exposure could have happened", Martin said.