The discovery of toxic chemical compounds in Hartford schools has prompted the closure of one school building, and now the city is pursuing litigation to recoup the cost of remediation.

The city has retained Dallas, Texas-based Baron & Budd, a law firm that has represented public entities nationwide whose water supplies, properties, or natural resources are affected by chemical contaminants. The firm on Oct. 23 filed a lawsuit in U.S. District Court on behalf of the city of Hartford and the board of education over alleged polychlorinated biphenyls, or PCB, contamination.