The EPA announced that Meramec Caverns is approved to open tours in the upper level of the caverns as of June 10, 2016.
Find the EPA Region 7 announcement that includes a list of controls that have been implemented in the caverns HERE.
The show cave closed on March 10, 2016, because of unsafe levels of TCE fumes. TCE is an unsafe solvent used in manufacturing of metals, like vehicle parts. The contamination most likely originates from Sullivan, Mo, four miles away from a landfill and the former TRW/Ramsey facility, according to the EPA.
Learn more about the contamination from an earlier Environmental Echo podcast report that can be found below.
Environmental Echo 