PITTSBURGH — The Butler School District is being sued in U.S. District Court by its insurance providers, which are aiming to avoid paying for legal costs and any judgments associated with a lawsuit filed over lead exposure.

Dr. Dale Lumley, the school’s former superintendent, is also named as a defendant in the suit.

The suit is seeking a declaration from the defendants that the two insurance providers have no obligation under their policies to pay defense costs or pay judgments in connection with Tait vs. Butler Area School District.

Lawyers from Dallas W. Hartman P.C. and Meyers, Evans, Lupetin and Unatin filed that suit in federal court in February on behalf of district resident Jennifer Tait, whose daughter attends Summit Township Elementary School, and “all other similarly situated individuals.”

The suit, which the attorneys hope will become a class-action claim, seeks to compel the district to provide more extensive medical treatment and testing and other damages for any people who were exposed to lead-tainted water at the Summit school.