N.Y.C. Admin. Code § 24-520.1: § 24-520.1 Non-stormwater discharges prohibited.

a. For purposes of this section, the following terms have the following meanings:

Allowable runoff. The term "allowable runoff" means runoff authorized by the rules of the department of environmental protection to enter storm sewers, provided that such rules shall be consistent with the proper maintenance and purpose of such storm sewers and with the state pollutant discharge elimination system (SPDES) permit for municipal separate storm sewer systems of New York city, SPDES No. NY-0287890 or its successor.

Storm sewer. The term "storm sewer" means a sewer, the primary purpose of which is to carry stormwater.

b. No person shall discharge or cause to be discharged, directly or indirectly, into any storm sewer any substance other than stormwater or allowable runoff. Rules governing allowable runoff may require practices and procedures related to such discharges in furtherance of this section. Such rules may also require approval by the department of such discharges.

c. For purposes of this section, indirect discharges include but are not limited to discharges to any street, gutter, or other conveyance that could reasonably lead to a storm sewer.

(L.L. 2017/097, 5/30/2017, eff. 6/29/2017)