Except as provided in Section 13.16.060 of this chapter, it is unlawful for any person to make or cause to be made any nonstormwater discharge. Notwithstanding the exemptions provided by subsections A and B of Section 13.16.060 of this chapter, if the Regional Water Quality Control Board or the enforcement official determines that any otherwise exempt discharge causes or significantly contributes to violations of any plan standard, or conveys significant quantities of pollutants to any receiving waters, or is a nuisance or poses a risk to public health or safety, it is unlawful for any person to make or cause to be made such discharge to the stormwater conveyance system. (Ord. 2004-042 § 1; Ord. 98-007 § 1; prior code § 87.01.105)