A kitchen drain clogged after Thanksgiving is almost always grease, starch and food scraps that went down the sink during cleanup. The fat was warm and liquid on Thursday night. By Friday it has cooled, stuck to the inside of the pipe and started catching everything behind it. It’s common enough that Roto-Rooter reported a 50% jump in calls the day after Thanksgiving.
The call usually comes Friday morning. The dishes are done, the guests have gone home or gone to bed, and the kitchen sink is holding two inches of gray water that won’t move. Sometimes the other side of the double sink is coming up too. And the disposal hums but doesn’t help.
Nothing broke overnight. The clog was built one pan at a time.
Why the Clog Shows Up a Day Later
The clog shows up a day later because grease changes from a liquid to a solid as it cools. Hot turkey drippings pour easily. Run hot water after them and they travel a few feet further, to where the pipe is cooler, and set there as a sticky coating.
That coating is the start. Rice, stuffing, mashed potatoes and pasta keep absorbing water after they go down the drain, so they swell and pack into the greasy section. Coffee grounds and eggshell bits join them. Meanwhile the sink, the disposal and the dishwasher run for hours, sending more of everything down the same line.
So by the time the last roasting pan is washed, the pipe is a lot narrower than it was at noon. It holds out overnight. But the first big rinse on Friday has nowhere to go.
If your kitchen sink clogs every holiday, or every few months in between, the pipe wall is coated. A plunger or a snake opens a path through that coating. Cleaning the kitchen line wall to wall is what keeps it open.
What to Do With the Grease Instead
Keep the grease out of the sink entirely, and put it in the trash once it cools. That’s the household guidance from LA County’s CleanLA program, which runs the county’s fats, oils and grease effort because grease builds up in sewer lines and causes overflows. It’s a citywide problem too. LA Sanitation says more than half of sewer backups in Los Angeles are caused by tree roots and grease.
- Pan drippings and fat: let them cool, pour them into a can or jar with a lid, seal it and throw it away.
- Greasy pans and plates: wipe them with a paper towel before they go in the sink or the dishwasher.
- Food scraps: scrape plates into the trash or green bin, and put a mesh strainer in the drain while you cook.
- Gravy and sauces: same as the fat. Container, lid, trash.
Hot water and dish soap don’t solve it. They move the grease a little further down the line, where it cools and sets anyway.
What the Disposal Can and Can’t Take
A disposal handles everyday food waste in small amounts, but it isn’t a trash can, and Thanksgiving is when people treat it like one. InSinkErator’s own guidance is to never put fats, oils or grease in a disposal or down the sink, because they collect inside the pipes.
The holiday scraps that cause the most trouble are the stringy, fibrous and starchy ones. Poultry skin, celery, and potato and fruit peels don’t grind fine enough to wash away. They wrap around the grinder or settle in the trap. Those belong in the trash or the green bin.
Run cold water, not hot, when you use the disposal, and keep it running for a few seconds after the grinding stops. Disposal makers recommend a strong cold flow to carry scraps all the way through the pipe.
Feed it a little at a time with the water already running. Packing it full and then switching it on is how disposals jam.
Kitchen Drain Clogged After Thanksgiving? Plunge First
Try a plunger first. Whether it works depends on where the clog sits, and most kitchen clogs are within a few feet of the sink, where a plunger reaches them. On a double sink, plug the other drain with a stopper or a wet rag first, otherwise the pressure just pushes water up the other side. Use a flat cup plunger, keep a few inches of water over the drain, and give it a dozen firm pumps.
If the disposal hums but won’t turn, switch it off. Most units have a red reset button on the bottom. Never put your hand inside a disposal.
Skip the chemical drain cleaner. Many contain sodium hydroxide, which causes severe burns to skin and eyes, and in a sink that isn’t draining it just sits in the pipe. It also makes the job dangerous for whoever opens that pipe next.
Call a plumber if a few rounds of plunging don’t move it, if water rises in a tub or shower when the sink drains, or if more than one drain is slow. Those point past the sink to the main line, the same pattern we covered in our article on sewer backups after the first big rain.
Apartments and Older Valley Homes
In an apartment building, your clog may not be your grease at all. Buildings in Van Nuys and North Hollywood often run one kitchen drain stack down a whole column of units. Every kitchen above you drains through the same pipe. On a holiday weekend that pipe carries every unit’s Thanksgiving cleanup, and the clog backs up into the lowest sink on the line.
If that’s your building, tell the owner or property manager. A stack clog is usually cleared from the building’s clean-out, not from one unit’s sink.
The single-family tracts in the same neighborhoods have a different problem. Many North Hollywood homes and Van Nuys houses from the 1940s and 50s still have their original cast-iron drains. Scale builds up inside cast iron over the decades and narrows the pipe, so those kitchens were already clogging every few months. Thanksgiving just gets there faster.
If the Sink Still Won’t Drain
A kitchen clog on a holiday weekend is annoying, but it’s rarely an emergency until water starts coming up somewhere it shouldn’t. If plunging hasn’t worked, leave it, stop running water into that sink, and hold off on the dishwasher.
Hard Hat Rooter and Plumbing is on call 24 hours a day, Thanksgiving weekend included, from our shop in Burbank. You get a flat-rate price before any work starts, with no holiday rate added on. Call (855) 331-7788, and check our current coupons before you book.
