They are suing the city over what they say is "tainted" water in their homes.
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Action News first reported on the problem five years ago and hundreds of homes in the area were tested for lead.
In 2016, five plaintiffs filed a lawsuit claiming the discolored drinking water also destroyed their galvanized plumbing.
RELATED: Class action lawsuit filed on behalf of group of Northeast Fresno residents dealing with discolored water
Testing by the city revealed lead and other toxins in more than 300 residences.
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Experts say the problems began in 2004 when the city switched over to a Surface Water Treatment Facility.
In the last five years, another lawsuit was filed by a different group of plaintiffs.
On Monday, a judge merged the two suits and granted class-action status.