Unless the Department of Environmental Quality has determined that the quantity or quality of the ground water in the surficial aquifer is not adequate to supply the proposed beneficial use, it shall be unlawful in a ground water management area for any person to construct a well for nonagricultural irrigation purposes except in the surficial aquifer. The provisions of this section shall not apply to wells constructed prior to the effective date of regulations adopted pursuant to subsection H of § 62.1-266.