What are the EPA Standards for MEK?

The EPA regulates MEK under the Clean Air Act (CAA) and the Resource Conservation and Recovery Act (RCRA). MEK is listed as a Hazardous Air Pollutant under the CAA and is regulated for industrial emissions. While there's no specific federal drinking water standard for MEK, it is monitored under the Unregulated Contaminant Monitoring Rule. Facilities must report MEK releases annually if thresholds are exceeded, and it's classified as hazardous waste under RCRA when discarded.