More than 27 years after Ohio regulators ordered a cleanup at Chillicothe’s former WearEver manufacturing plant, new groundwater testing shows industrial chemicals remain beneath the property and have migrated beyond its boundaries. The results, described in October 2026 environmental filings and reports prepared for Howmet Aerospace dated October 10, 2026, indicate some concentrations far exceed federal drinking-water standards.
The chemicals include trichloroethylene, vinyl chloride, and other chlorinated solvents. They were found in groundwater beneath the former plant, and the filings describe contamination that has moved beyond the property’s boundaries, so the problem cannot be treated as contained to the original site alone.
The WearEver site has faced cleanup orders and oversight for decades, and the latest testing is a reminder that an order to clean up a site and a completed cleanup are not the same thing. Groundwater contamination from chlorinated solvents can persist underground for many years, and documenting where it is and where it is moving is necessary before anyone can say it is shrinking or under control.
Plans to expand the groundwater monitoring network remain delayed because agreements allowing access to neighboring properties have not been finalized. Without that access, additional monitoring points cannot simply be installed where they may be needed, limiting how completely the extent and direction of contamination beyond the property can be tracked.
A second uncertainty involves the neighboring former Chillicothe paper mill, which is undergoing major ownership and operational changes. Those changes have created uncertainty about an industrial groundwater pumping system that helped control the direction of the contamination for years. If that system changes, managing the contamination’s movement becomes more complicated.
For Chillicothe residents, the new tests confirm a broader picture: contamination addressed by regulators more than 27 years ago is still present, still measured in some cases at levels described as far above federal drinking-water standards, and has spread beyond the former plant’s boundaries. That is why continued monitoring and oversight matter to the community around the site.
What happens next is procedural but important: finalize the access agreements for neighboring properties, expand the groundwater monitoring network once access exists, clarify the future of the neighboring pumping system, and continue oversight under the existing regulatory framework. Until those steps are completed and later testing shows a different result, the October filings leave the same conclusion: contamination at the former WearEver property persists.