Heptachlor Epoxide MCL Heptachlor Epoxide MCL https://www.tceq.texas.gov/downloads/drinking-water/notices/chemical/heptachlor-epoxide.docx/view https://www.tceq.texas.gov/@@site-logo/TCEQ-logo-header.png Heptachlor Epoxide MCL Heptachlor Epoxide MCL heptachlor-epoxide.docx — 27.7 KB