Superfund Site Profile

The third five-year review will be kicking off in the summer of 2017. Five-year reviews provide an opportunity to evaluate the implementation and performance of a remedy to determine whether it remains protective of human health and the environment.

After more than 50 years in operation, Timberweld Manufacturing, former owners of a portion of the site, ceased operations in 2015. The remaining assets including property where treated soils have been left in place were auctioned off in early 2017. EPA is working with the new property owners to facilitate redevelopment of this property while ensuring the remedy remains protective of human health and the environment.


The 4.5-acre Mouat Industries site is located in Columbus, Montana. From 1957 to 1962, Mouat Industries processed chromite ore mined from the Stillwater Mining Complex in south-central Montana. The process generated wastes containing sodium chromate and sodium dichromate. Waste piles leached contamination into the soil and groundwater. Further contamination resulted from sodium dichromate spills during normal facility operations. Cleanup of soils and groundwater was completed between 1990 and 2008. Following cleanup at the site, operation and maintenance activities are ongoing.