NYC Grease Trap Rules: What Restaurants Need to Know

A pizzeria owner in Hoboken called us last fall after his second DEP visit in six months. The trap was clean. The trap was sized correctly. He was getting written up because his cleaning manifests weren't on site, and he couldn't tell the inspector when his last service was.

That's the pattern we see most often. Operators who actually maintain their grease trap still get cited because they don't know exactly what the inspector wants to see. The good news is the rules are tighter than most people think but simpler too. Once you understand the three or four things that matter, compliance gets a lot easier.

Here's how it actually works.

What FOG Means and Why NYC Cares

FOG stands for fats, oils, and grease. Every commercial kitchen produces it, and when it hits the sewer it cools, hardens, and sticks to pipe walls. Over time, that buildup contributes to the kind of citywide blockages New Yorkers know as "fatbergs."

Under NYC DEP sewer use regulations, any food service establishment that discharges FOG into wastewater is required to install and maintain a properly sized grease trap or grease interceptor. That covers restaurants, cafes, bars, hotels, hospitals, day cares, senior centers, and most food processing operations.

The DEP doesn't ban FOG. It requires you to capture it before it hits the sewer.

Cleaning Frequency Rules Under NYC DEP

NYC DEP doesn't set a single calendar interval. The rule is performance-based: the trap has to be cleaned often enough that grease and solids never exceed 25 percent of the unit's total liquid depth.

In practice, that lands most kitchens in a 30 to 90 day cleaning cycle. A few patterns we see across NYC and North Jersey:

• High-volume frying or grilling operations often need monthly service, sometimes every two to three weeks

• Mid-volume full-service restaurants typically run 30 to 60 days

• Smaller cafes and prep kitchens can sometimes stretch to quarterly

If you're not sure where you fall, the right move is to monitor for a couple of cycles, find your fill pattern, and lock in a cadence that keeps you under 25 percent.

The 25 Percent Rule Explained

This is the part operators get wrong most often. The 25 percent rule isn't 25 percent of the tank height. It's 25 percent of the total liquid depth the trap was designed to hold.

That includes both the floating grease layer at the top and the settled solids at the bottom. Add them together, and once the combined thickness crosses one quarter of the design liquid depth, the trap is no longer doing its job. FOG starts slipping past the baffles and heading downstream.

Two things follow from that:

1. Skimming only the top layer doesn't bring you back into compliance. The bottom solids count too.

2. A "topped off" trap that looks clean from above can still be over the limit if the sludge layer is heavy.

A proper service should pump everything out, scrape the walls, check the baffles, and get the trap fully empty before refilling.

Records You Need to Keep On Site

This is where most kitchens get caught. The DEP can ask for documentation during any inspection, and "we cleaned it last month" doesn't count as proof.

What you should have on file, accessible from the kitchen:

• A signed cleaning manifest from your hauler for every service

• The hauler's NYC Business Integrity Commission license number, since only BIC-licensed companies can legally transport trade waste in the city

• Yellow grease (used cooking oil) collection records, kept on site for at least one year

• Your trap's installation paperwork and sizing calculations

Keep a binder near the back of the house, or save digital copies you can pull up on a phone. If an inspector asks and you can produce the last six months of manifests in 30 seconds, the conversation goes a lot better.

We saw this go sideways at a Hoboken restaurant that lost $8,000 over a single weekend after skipping a grease trap cleaning. That story is worth a read if you want to see how fast a paperwork or maintenance gap can compound into closure-level problems.

How North Jersey Rules Compare

If you operate on the Jersey side or have locations in both, the rules are similar in spirit but a little different in detail.

New Jersey Administrative Code 7:9A-8.1 sets the foundation. A grease trap serving a restaurant, cafeteria, or institutional kitchen cannot be smaller than 750 gallons. Sizing is calculated using a formula based on dining seats, hours of operation, and a location-based loading factor.

On cleaning frequency, North Jersey municipalities typically apply the same 25 percent threshold, though some towns layer on minimum cleaning intervals (often 90 days regardless of fill level). NJDEP also requires a manifest for every load of grease trap waste leaving your kitchen, with manifest records kept for at least three years. In Passaic Valley Sewerage Commission territory, the retention requirement extends to five years.

If you're operating in Fair Lawn, Paramus, Hackensack, Hoboken, Jersey City, or Fort Lee, check with your local health department for any town-specific cleaning interval or licensing requirement on top of the state rule.

FAQ

Does NYC require a specific cleaning interval, or just the 25 percent rule? The base rule is 25 percent. Some boroughs and program areas layer on minimum intervals, but the performance standard is the controlling rule.

Can I clean my own grease trap? You can monitor it and skim, but legally hauling the waste away requires a BIC-licensed trade waste removal company in NYC and an NJDEP-permitted hauler in New Jersey.

What's the difference between a grease trap and a grease interceptor? A trap is smaller, usually 20 to 100 gallons, often installed under a sink. An interceptor is larger, typically 750 gallons or more, installed underground or in the basement for higher-volume operations.

How long should I keep cleaning records? At least one year for yellow grease records in NYC. NJDEP manifests should be kept for at least three years, five if you're in PVSC territory. Most operators keep everything for five years across the board to be safe.

If you run a kitchen in North Jersey or the NYC area and you're not sure your cleaning interval or paperwork would hold up to a DEP visit, give us a call at (862) 200-0055. We'll come out, take a look at the trap, walk through your records, and tell you straight whether you're set up well or whether something's worth fixing. No pressure either way.

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