Four states and dozens of California cities and water districts have joined a qui tam lawsuit, unveiled this week, seeking millions of dollars in damages against a company for allegedly supplying customers with substandard PVC pipe.

The suit, brought against J-M Manufacturing Co. and its former parent company, Formosa Plastics Corp., alleges that J-M sold PVC pipe that had tensile strength below industry standards, and that the company deceived customers by choosing stronger samples for independent certification of its product. The suit also contends that under the company president, Walter Wang, it “implemented a series of ‘cost-cutting’ measures that undermined the quality of J-M’s PVC pipe products,” including filling supervisory positions with less experienced managers.