The Citywide Blog

Every December, the calls start coming in. A diner in Queens with a floor drain that won’t clear during the Saturday breakfast rush. A Midtown office building with a backed-up slop sink on the loading dock. A catering hall in Nassau County that smells like rancid grease two days before a 300-guest holiday party. The common thread is cold weather, and the common fix is drain cleaning that should have happened in October.

At Citywide Sewer-Drain & Plumbing, we’ve been clearing commercial drains across Manhattan, Brooklyn, Queens, Nassau County, and Suffolk County for decades, and winter is far and away our busiest season for emergency commercial calls. Here’s why cold weather is so hard on commercial plumbing, and what you can do now to keep your business open and your inspector happy.

Cold Pipes Turn Grease Into Concrete

Grease is the enemy of every commercial drain, but in warm months it at least stays soft enough to move. When a line of hot dishwater carries fats, oils, and grease down the drain in July, most of it reaches the grease trap or the sewer before it cools. In January, the story changes.

Commercial drain lines in New York buildings often run through unheated basements, crawlspaces, exterior walls, and under slabs that sit on frozen ground. When grease-laden water hits a pipe wall that is 40 degrees, the grease congeals almost immediately. It coats the inside of the pipe in layers, each one narrowing the line a little more. By mid-winter, a four-inch kitchen line can be carrying water through an opening the size of a quarter. Then a busy shift pushes one more load of food scraps through, and the whole thing seals shut.

That’s why a clog in February is usually much harder to clear than the same clog in August. The grease is colder, denser, and bonded to months of accumulated buildup. A job that would have taken a quick snaking in the fall can require hydro-jetting by winter.

Your Grease Trap Fills Faster Than You Think

Grease traps and interceptors depend on time and temperature to work. Wastewater enters, slows down, and the grease separates and floats to the top while the water passes through. In cold weather, grease solidifies in the trap more quickly and in larger chunks, which means the trap reaches capacity sooner than your normal schedule accounts for.

Add holiday volume on top of that. Restaurants, hotels, caterers, and institutional kitchens across the city run harder from Thanksgiving through New Year’s than at any other time. More covers means more fryer oil, more roasting pans, more dish loads, and more grease heading into a trap that is already struggling with the cold. A trap that was fine on a 90-day schedule in the summer may need attention every 30 to 45 days in winter, and NYC and Long Island inspectors don’t adjust their expectations for the season.

Winter Is Inspection Season in New York

Businesses in the five boroughs are subject to New York City DEP grease interceptor rules, which require proper sizing, regular cleaning, and maintenance records on file. Nassau and Suffolk County have their own health department and sewer district requirements for food-service establishments. An overflowing or neglected trap can mean a violation, a fine, and in serious cases a forced closure until the problem is corrected.

Those inspections don’t pause for the holidays. A backup that sends gray water across a kitchen floor during a December health inspection is the kind of thing that ends up in a public report. Keeping your drains and trap clean through the winter is as much about protecting your reputation as it is about protecting your pipes.

Frozen Lines, Slow Drains, and Floor Drain Backups

Grease isn’t the only winter problem. Commercial properties in the New York area deal with several cold-weather drain issues that homeowners rarely see:

• Floor drains in loading docks, garages, and walk-in coolers can freeze when water sits in a trap that’s exposed to cold air, and a frozen floor drain backs up every fixture tied to it
• Exterior grease interceptors on Long Island can develop a frozen cap of grease that blocks the inlet and sends wastewater back into the building
• Rooftop and exterior drain lines on Manhattan and Brooklyn buildings can ice up and overflow into mechanical rooms and basements
• Road salt and sand tracked into buildings washes into floor drains and settles in the lines, combining with grease to form a dense sludge
• Older cast iron drain lines in pre-war buildings contract in the cold and are more prone to cracking, especially where corrosion has already thinned the pipe

Each of these starts as a slow drain and ends as a flooded floor if nobody addresses it.

The Cost of Waiting

A commercial drain emergency in winter costs more than the same service scheduled in advance, and not only because of the plumbing bill. A blocked kitchen drain can shut down a line during the busiest shift of the year. A sewage backup can close a dining room for a day or more while it’s cleaned and sanitized. A frozen floor drain in a parking garage can flood the mechanical room below it and take out a boiler in the middle of a cold snap.

Compare that to a scheduled drain cleaning and grease trap service in the fall, which takes a couple of hours, happens before or after business hours, and costs a fraction of an emergency call-out plus lost revenue.

What a Pre-Winter Commercial Drain Service Should Include

If you manage a restaurant, commercial kitchen, office building, apartment building, hotel, school, or healthcare facility anywhere in the New York metro area, a thorough winter prep covers more than running a snake down the kitchen sink.

Hydro-jetting of main drain lines. High-pressure water scours grease, scale, and debris off the full inside wall of the pipe rather than just punching a hole through the middle of a clog. This is the only way to actually restore a line to its original diameter before winter.

Grease trap or interceptor pumping and cleaning. A full pump-out, scraping of the walls and baffles, and inspection of the inlet and outlet. For businesses in the five boroughs, we document the service for your DEP records.

Floor drain inspection and cleaning. Clearing sediment and grease from every floor drain, making sure traps hold water, and checking the drains in cold-exposed areas that are most likely to freeze.

Camera inspection. A sewer camera shows exactly what condition the line is in, where the buildup is heaviest, and whether there’s any cracking, root intrusion, or bellied pipe that will cause trouble in the cold.

A winter maintenance schedule. Based on what we find, we recommend a cleaning interval that matches your volume and your exposure to cold, so you’re not guessing.

Commercial Drain Cleaning Across the Five Boroughs and Long Island

Citywide Sewer-Drain & Plumbing serves restaurants, property managers, building owners, and facilities teams throughout Manhattan, Brooklyn, Queens, Nassau County, and Suffolk County. We provide hydro-jetting, grease trap and interceptor cleaning, floor drain and main line clearing, camera inspections, and 24-hour emergency response, with no extra charge for nights, weekends, or holidays.

Don’t wait for the first hard freeze to find out which drain in your building is going to fail. Call Citywide Sewer-Drain & Plumbing at 1-888-458-3380 to schedule your pre-winter commercial drain cleaning, or reach us any time of day or night when something backs up.