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Grease Compliance from the NYCDEP


Requirements for the Proper Sizing of Grease Interceptors

The New York City Department of Environmental Protection (DEP) would like to remind you that grease interceptors must comply with Title 15, Rules of the City of New York (RCNY), section 19-11 including Tables I and/or II (DEP’s “Best Management Practices (BMPs) for Non-Residential Direct and Indirect Dischargers of Grease to the Public Sewer System”).

DEP’s grease interceptor sizing criteria go beyond NYC Department of Buildings (DOB) requirements, and are not included in the current Plumbing Code. However, failure to install properly sized grease interceptors can result in violations and fines when DEP inspectors check businesses’ grease interceptors.

Before purchasing a grease interceptor, also check that it has certification with Plumbing and Drainage Institute (PDI) or American Society of Mechanical Engineers (ASME) standards along with DEP sizing requirements—see section 19-11(b) of the attached regulations. Such grease interceptors can be found at the following websites: and

DEP has also published a brochure, “Preventing Grease Discharges Into Sewers”, which contains information on grease compliance, installing and maintaining grease interceptors, grease recycling (including waste cooking oil) and locating licensed grease recycling companies, as well as a “Smart Business” brochure which describes other (but not all) DEP environmental compliance requirements.

For any grease-related questions, please contact DEP’s Bureau of Wastewater Treatment, Compliance Engineering Section, at 718-595-4711 or 595-4731.
For other questions, please contact DEP’s Economic Development Unit at 718-595-4436.

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