A Florida federal judge has denied certification of a class in litigation worth a claimed $1 billion by Palm Beach County residents who said their property values plummeted thanks to pollution from a nearby Pratt & Whitney plant.

The homeowners alleged industrial contamination affected values in a residential community outside of Palm Beach called “the Acreage.” The putative class action named United Technologies Corp. and its subsidiary, Pratt & Whitney Group, owner of a rocket and aerospace testing and manufacturing plant situated north of the community.