An audience has gathered at Hastings District Court, where the initial hearing for the Havelock North water contamination inquiry has begun.
Last month the Government announced an independent inquiry into August's widespread gastro outbreak, when E.coli in the Hastings suburb's water supply caused about 5200 people to become ill. Two elderly women who had underlying medical conditions died while sick with campylobactor.
The inquiry, expected to report back by the end of next March, will explore the outbreak's cause, the responses to it, and how to prevent such instances in future.
The hearing - expected to last all day - will take appearances from interested parties on preliminary and procedural matters, including the designation of parties as "core participants" under s17 of the Inquiries Act 2013.
A number of parties - from Crown Law on behalf of the Ministry of Health, Ministry for the Environment, and Department of Internal Affairs to local residents - will be appearing.