Roto-Rooter, which is a nationwide plumbing company, said it’s the busiest day of the year for them, with incoming calls increasing 50% above the average Friday.

The company said their plumbers see many kitchen sink clogs or jammed garbage disposals, main sewer clogs, and toilet clogs, during Turkey Day weekend.

Often, the case is that a house already has partially clogged drains that go unnoticed, until holiday guests arrive and overwhelm the system,” Paul Abrams, who is the spokesman for Roto-Rooter, noted on the company’s website, adding that the four-day Thanksgiving weekend averages a 21% increase over any other Thursday through Sunday period during the year.

“Even more problematic is that virtually every traditional Thanksgiving dish is a drain clogging culprit.”

Turkey grease, as well as pasta and rice, are at the top of the list. Hot drippings may be in liquid form when poured down the drain but the liquid will solidify like candle wax once it cools down inside the pipes,” the website noted. “Rice and pasta swell when introduced to water. Worse, they’ll break down into a starchy gel and clog the pipes. Toss in some poultry skin, dressing, vegetable peels and a bone or two and you’ve got a sewer or drain clog of monumental proportions.”

Plus, many guests likely means more people are using sinks, toilets, showers, and bathtubs. Guests who stay overnight might also need to do laundry.

“This extra strain on the plumbing system is like the proverbial last straw that breaks a camel’s back,” according to the website. “Chances are that the house already had a partially clogged drain or two but the problem was not altogether noticeable yet. However, once a few more guests show up, the drains become overwhelmed.”

“Try to address any plumbing problems before the holiday and before guests arrive,” the company noted. “However, in the case of holiday plumbing emergencies, don’t hesitate to ask a plumber, up front, about extra holiday service fees.”