If the commission determines, after adequate scientific investigation and evaluation, that a chemical as defined in Sections 69-23-3 and 75-47-5(a) in the underground water exceeds or is likely to exceed duly adopted state standards and that the source of the chemical is not within the regulatory jurisdiction of the commission, the commission shall notify the Department of Agriculture and Commerce, which shall proceed in accordance with Section 69-23-7 and other existing laws.