On July 1, 2025, EPA Region 1 sent a letter to Pharmacia & Upjohn Company, LLC ( P&U ) to terminate a 2011 RCRA Corrective Action Order on Consent that required cleanup of the former 78-acre Pharmacia & Upjohn manufacturing facility in North Haven, Connecticut (the 2011 Order ). EPA also issued a revised TSCA Determination on July 1. The site, which is located on the banks of the Quinnipiac River, was contaminated with polychlorinated biphenyls, volatile organic compounds, and metals after years of use as a manufacturing facility for pharmaceuticals. In 2003, Pfizer merged with Pharmacia and took over the responsibility for cleaning up the site. Before issuance of the 2011 Order, Pfizer and/or its predecessors had studied the site under a previous EPA order and implemented ?interim measures? to stem the flow of contaminated groundwater and prevent contact with PCBs and other contaminants. The formal site cleanup plan, approved in 2010, proposed using a wide variety of corrective measures ? thermal treatment of contaminants, pumping and treating groundwater, excavating contaminated soils, consolidation of some soils on site under low permeability caps, recording restrictive covenants to control future land uses, and renovating habitat, among others. On the eastern side of the property, approximately 57 acres of wetlands and upland meadows have been restored, and a two-mile interpretive trail system now winds along the banks of the Quinnipiac River. This preserve is open to