Grease Trap and Interceptor Requirements for New York Food Service

Grease trap and interceptor requirements govern how food service establishments in New York manage fats, oils, and grease (FOG) before wastewater enters the municipal sewer system. These requirements apply to restaurants, institutional kitchens, food processing facilities, and any commercial kitchen producing grease-laden discharge. Noncompliance carries enforcement consequences including stop-work orders, civil penalties, and mandatory sewer surcharges administered by local sewer authorities and the New York City Department of Environmental Protection (NYC DEP) or its upstate equivalents.

Definition and scope

A grease trap (also called a grease interceptor) is a plumbing device engineered to intercept and retain fats, oils, and grease before they reach the sanitary sewer system. FOG that enters the sewer solidifies at lower temperatures, contributing to sewer blockages known as fatbergs — a documented failure mode in combined sewer systems including New York City's aging infrastructure.

In New York, grease trap requirements fall under two overlapping regulatory frameworks:

New York City: The NYC Plumbing Code (based on the International Plumbing Code with local amendments) and NYC DEP rules under Title 15 of the Rules of the City of New York (15 RCNY)
New York State (outside NYC): The New York State Uniform Fire Prevention and Building Code and applicable county or municipal sewer use ordinances

The NYC Administrative Code Chapter 19-A establishes specific registration and maintenance requirements for grease interceptors at food service establishments. Establishments with a seating capacity of 20 or more, or those producing commercial quantities of FOG, are generally subject to mandatory interceptor installation under NYC DEP regulations.

Scope is defined primarily by fixture count, meal volume, and discharge characteristics — not by business classification alone. Catering operations, ghost kitchens, and institutional cafeterias serving hospitals or schools fall within this regulatory scope in addition to traditional sit-down restaurants. For the broader regulatory landscape governing plumbing in food service environments, see Regulatory Context for New York Plumbing.

How it works

Grease interceptors operate on the principle of differential density: fats and oils are less dense than water and rise to the surface of a retention chamber, while solids settle to the bottom. The clarified effluent exits through a baffle and enters the sewer.

Two primary device types define the classification boundary:

Feature	Passive (Hydromechanical) Grease Interceptor	Gravity Grease Interceptor
Location	Indoors, under sink or in floor	Outdoors or in vault, typically below grade
Capacity	8–100 gallons	500–2,000+ gallons
Applicable code standard	ASME A112.14.3 or PDI G101	ASME A112.14.4
Typical application	Small café, food truck commissary	Full-service restaurant, institutional kitchen
Pumping frequency	Weekly to monthly	Every 30–90 days

The American Society of Mechanical Engineers (ASME) and the Plumbing and Drainage Institute (PDI) publish the referenced standards, which are incorporated into both the NYC Plumbing Code and New York State code frameworks.

Sizing calculations depend on drainage flow rate, expressed in gallons per minute (GPM). A standard formula accounts for the number and type of fixtures (3-compartment sinks, dishwashers, floor drains) and the drain pipe diameter. Undersized interceptors — a documented failure mode in NYC DEP enforcement actions — allow FOG breakthrough.

Common scenarios

New restaurant buildout: A new food service permit application to the NYC Department of Buildings triggers a plumbing plan review. The design must include an interceptor sized per calculated GPM load and identified by ASME standard number. Inspection is required before wall close-in and again at final sign-off. See New Construction Plumbing New York for process framing on new installations.

Renovation of an existing kitchen: A change-of-use or kitchen expansion in an existing building may trigger retroactive interceptor installation under NYC Administrative Code §24-526. The NYC DEP Food Service Establishment (FSE) program requires registration of the interceptor and documentation of pumping contracts. Plumbing for New York Renovations and Gut Rehabs covers permit sequencing for these projects.

Upstate municipal requirements: Outside the five boroughs, a food service establishment discharging to a publicly owned treatment works (POTW) must comply with the local sewer use ordinance. Industrial pretreatment standards under EPA 40 CFR Part 403 establish the federal baseline; local authorities having jurisdiction (AHJ) set tighter limits. Saratoga County, Monroe County, and the City of Buffalo each publish separate FOG control ordinances.

Grease trap failure and sewer backup: Blocked building drains attributable to FOG accumulation are classified as a Category 2 violation in NYC DEP enforcement. Penalties under 15 RCNY §19-18 are structured as per-day assessments. The New York Plumbing Violations and Penalties reference page covers the enforcement hierarchy.

Decision boundaries

Determining whether a specific installation requires a passive hydromechanical interceptor or a large-capacity gravity interceptor hinges on 4 key factors:

Total fixture unit count: Facilities with combined drainage load exceeding the threshold specified in NYC Plumbing Code Table 1003.3.4 require gravity interceptors
Available floor space and utility access: Indoor passive units require maintenance access clearances per ASME A112.14.3
Local sewer authority requirements: Some upstate POTWs require gravity interceptors regardless of fixture count when discharge exceeds 50 GPM
Grease waste volume per service: High-volume operations (fryers handling more than 50 pounds of grease per day) trigger larger sizing multipliers under PDI G101 calculations

Permitted plans must identify the device model, capacity, ASME/PDI certification number, and installation depth. NYC DEP's FSE program maintains a registry of approved interceptor models; installations using non-listed equipment are subject to rejection during plan review.

The distinction between a grease trap and a grease interceptor is not merely terminological — under NYC Plumbing Code §1003.3, the two classifications carry different sizing methodologies and inspection frequencies. Passive units require inspection every 30 days in high-volume establishments; gravity units are typically pumped on a 90-day cycle unless the DEP-issued maintenance schedule specifies otherwise.

The New York Plumbing Authority index provides a structured reference map of the professional and regulatory landscape for all plumbing categories in New York, including food service applications. For permitting process detail applicable to grease interceptor installations specifically, New York Plumbing Inspection Process covers the inspection sequencing and documentation requirements enforced by the NYC Department of Buildings and its upstate equivalents.

Scope and coverage limitations

This page addresses grease trap and interceptor requirements applicable to New York State, with emphasis on New York City (five boroughs) and reference to upstate municipal frameworks. It does not apply to New Jersey, Connecticut, or other states, even where facilities operate near state borders. Federal pretreatment standards under EPA 40 CFR Part 403 apply nationally and are not modified or interpreted here. Residential plumbing — including single-family homes, two-family dwellings, and residential apartments without commercial kitchen fixtures — does not fall within the scope of commercial FOG regulations described on this page. Healthcare facilities subject to separate NYSDOH facility regulations, and food processing plants regulated under USDA jurisdiction, may face additional or different requirements not covered here.