Hexachlorobenzene MCL Heptachlor MCL https://www.tceq.texas.gov/downloads/drinking-water/notices/chemical/hexachlorobenzene.docx/view https://www.tceq.texas.gov/@@site-logo/TCEQ-logo-header.png Hexachlorobenzene MCL Heptachlor MCL hexachlorobenzene.docx — 27.8 KB