Sporlan Valve Plant #1 Superfund Site, Washington, Franklin County, Missouri - Fact Sheet, May 2021

The property where the former Sporlan Valve Plant #1 facility operated is an unoccupied, 4-acre parcel at 611 E. 7th Street near downtown Washington, Missouri. The site includes a groundwater contamination plume that has migrated beyond the boundaries of that property. Based on groundwater monitoring results, the contaminant plume is known to extend to the east toward MacArthur Street and to the south toward 8th Street. The site was first developed as a refrigeration valve manufacturing plant in 1939. Continuous additions were constructed until 1968 when the final addition was added, bringing the total area of the plant to 80,000 square feet. Operations at the refrigeration valve manufacturing plant included plating, degreasing, machining, brazing, assembly, and testing.

Vapor Intrusion (VI) sampling by the Missouri Department of Natural Resources (MoDNR) in 2015 identified concentrations of trichloroethylene (TCE) that exceeded indoor air and sub-slab screening levels. Following MoDNR’s receipt of VI sampling results, the site was referred by MoDNR to the U.S. Environmental Protection Agency (EPA) on Aug. 20, 2015, for a removal action. EPA began a removal action to address VI issues. The site was added to the National Priorities List (NPL) in 2019. A Remedial Investigation is underway at the site.

Learn more about the Superfund Process. For additional information and documents related to this site, including the Administrative Record, visit EPA’s Site Profile Page.

Previous site actions have been taken to address immediate threats to human health and the environment, including sampling of indoor air at properties close to the site and installing mitigation systems, where needed. The goal for this ongoing work is to characterize the existing contamination to inform the long-term remediation of the site.