The owner or operator of a premises used for any commercial or industrial purposes shall provide, at the owner or operator's own expense, reasonable protection from an accidental discharge of prohibited materials or other wastes from entering into the stormwater drainage system or natural water body through the use of structural and nonstructural BMPs. Further, any person responsible for a property or premises that is, or may be, the source of an illicit discharge may be required to implement, at their expense, additional structural and nonstructural BMPs to prevent the further discharge of pollutants to the stormwater drainage system or natural water body. Compliance with all terms and conditions of a valid NPDES permit authorizing the discharge of stormwater associated with industrial activity, to the extent practicable, shall be deemed compliance with the provisions of this section.