NYC DEP regulates stormwater through 15 RCNY Chapter 31, requiring on-site stormwater management for all developments disturbing 20,000+ sq ft. NYC's combined sewer system makes stormwater management critical. The city has invested over $1 billion in green infrastructure.
NYC's stormwater regulations are among the strictest in the nation due to its combined sewer system, where stormwater and sewage share the same pipes. DEP's Stormwater Management Rules (15 RCNY Ch. 31) require all new development and major renovations on sites of 20,000 sq ft or more to manage stormwater on-site, retaining the first inch of rainfall. Approved methods include green roofs, bioswales, rain gardens, permeable pavement, and detention/retention systems. The DEP reviews and approves site connection proposals through the Site Connection Application process. NYC's MS4 (Municipal Separate Storm Sewer System) areas in parts of the Bronx, Queens, Brooklyn, and Staten Island have separate stormwater requirements under the federal Clean Water Act NPDES program. The city's Green Infrastructure Plan aims to manage 10% of impervious surfaces through green infrastructure by 2030. DEP conducts enforcement inspections and can require post-construction maintenance agreements.
Failure to implement required stormwater management: DEP violation with fines of $1,000–$10,000 per day. Stop-work orders from DOB. Illicit discharges to the storm sewer system: DEP penalties up to $25,000 per violation under Admin Code §24-523.
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