1. (1) For calendar year reporting period 2008 and thereafter, those substances identified as chemicals of special concern in 40 CFR Part 372.28 shall be designated as higher hazard substances.

2/27/26 (Effective 12/19/25) - corrected 301 CMR - 246.13

1. (2) For calendar year reporting period 2008 and thereafter, the following substances shall be designated as higher hazard substances:

   CAS # Chemical Name 79-01-6 Trichloroethylene 7440-43-9 Cadmium Cadmium Compounds

2. (3) For calendar year reporting period 2009 and thereafter, the following substance shall be designated as a higher hazard substance:

   CAS # Chemical Name 127-18-4 Perchlorethylene

3. (4) For calendar year reporting period 2012 and thereafter, the following substances shall be designated as higher hazard substances:

   CAS # Chemical Name 50-00-0 Formaldehyde

   Hexavalent Chromium Compounds

4. (5) For calendar year reporting period 2014 and thereafter, the following substance shall be designated as a higher hazard substance:

   CAS # Chemical Name 75-09-2 Methylene chloride

5. (6) For calendar year reporting period 2016 and thereafter, the following substances shall be designated as higher hazard substances:

   CAS # Chemical Name 106-94-5 1-Bromopropane 68-12-2 Dimethylformamide 7664-39-3 Hydrogen fluoride

   Cyanide compounds

6. (7) For calendar year reporting period 2017 and thereafter, the following substances shall be designated as higher hazard substances:

   CAS # Chemical Name 584-84-9 2,4 - Toluene diisocyanate 91-08-7 2,6 - Toluene diisocyanate 26471-62-5 Toluene diisocyanate - mixed isomers