NYC Unified Stormwater Rule

15 RCNY Chapters 19.1 and 31 — Unified Stormwater Rule

DEP's Unified Stormwater Rule, adopted in 2022, amended Title 15 RCNY Chapter 19.1 (stormwater construction permitting) and Chapter 31 (house/site sewer connection proposals) to extend stormwater performance and construction-permit requirements—previously limited to the MS4 storm sewer system—to development discharging to the combined sewer system as well. It applies to development that disturbs 20,000 sq ft or more of soil or creates 5,000 sq ft or more of new impervious surface, requiring covered projects to submit a Stormwater Pollution Prevention Plan (SWPPP) and obtain a stormwater construction permit before beginning work. The Chapter 31 amendments do not apply to sites with a sewer availability certification issued before February 15, 2022.