A change to this document has been announced. According to the government, the effect of this change is notably to (1) adopt groundwater quality standards for 44 substances with established interim maximum allowable concentrations and 33 substances without established interim maximum allowable concentrations, (2) add Chemical Abstracts Service Registry Numbers (CASRNs) for the groundwater standards, and (3) organize the groundwater quality standards in a table. The first effective date of the document that makes the change is April 1, 2022. More information about the change, including any additional effective dates, is available here and here.

Published : 4 May, 2022