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