The commission may identify, by narrative description, illustration, maps, or other means, and shall protect as an underground source of drinking water, all aquifers and parts of aquifers which meet the definition of underground sources of drinking water under 20 AAC 25.990, except to the extent there is an applicable freshwater aquifer exemption under 20 AAC 25.440, or an expansion to the areal extent of an existing Class II enhanced oil recovery or enhanced gas recovery aquifer exemption for the exclusive purpose of Class VI injection for carbon storage under 20 AAC 25.442. Other than an approved aquifer exemption expansion that meets the criteria under 20 AAC 25.442(d), new aquifer exemptions will not be issued for a Class VI well; a Class VI well has the meaning in 20 AAC 25.1900. Even if an aquifer has not been specifically identified by the commission, it is an "underground source of drinking water" if it meets the definition of "underground source of drinking water" in 20 AAC 25.990.