A kitchen sink that drains slowly is more than an annoyance. It is a pipe filling up with something. The question is where.
Kitchens differ from bathrooms because of grease, food starch and the dishwasher. This guide helps you separate a local problem from a bigger one.
If the sink fills with sewage or the basement drain rises, call the 24/7 line.
Grease: The Quiet Cause
Warm grease flows. Cool grease sticks. Over months it coats the pipe wall and narrows the line until water barely moves. The sink never fully clogs, which is why it feels mysterious.
Hot water helps a little, but it pushes grease farther down, where it cools again. A cable with a cutting head scrapes the wall. For stubborn lines, hydro jetting cleans the whole pipe.
Four Places To Look
| Location | Clue | Fix |
|---|---|---|
| Strainer and trap | Slow only at this sink | Clean the trap and strainer |
| Disposal outlet | Slow with the disposal installed | Clear the disposal and the baffle |
| Branch line to the main | Slow after the trap is clean | Cable the branch |
| Main line | Other drains slow, floor drain gurgles | Cable and camera the main |
A dishwasher that leaves water in the bottom points to the same branch. See garbage disposal repair if the disposal is involved.
Want a plumber on the way? The line is open all day and all night.
☎ Call (732) 466-1098A Bellied Pipe Looks Like A Slow Drain
A belly is a low spot in a horizontal pipe that holds standing water. Waste settles there. A cable can clear it, but the problem returns. A camera confirms the belly and shows how bad it is.
Repair options range from monitoring to replacing a short section. Our sewer inspection page explains the camera visit.
Where To Ask About The Street Side
If your whole block is slow, ask the North Brunswick water and sewer office, on the second floor of the municipal building at 710 Hermann Road, whether the township main has an issue. The office is open from 8:30 to 4.
If only your house is affected, the cause sits on your side of the connection. In 2020 the township counted 15,789 housing units, and plenty of them have kitchen lines older than most appliances in them.
The Dishwasher Connection
A dishwasher drains through the sink trap or the disposal. If the branch line is partly blocked, the dishwasher leaves water at the bottom and the sink slows down. A high loop in the hose or an air gap prevents dirty sink water from running back.
If the dishwasher problem started the same week as the slow sink, treat them as one problem. Clear the branch and both usually recover.
What A Camera Visit Adds
A camera in the branch line tells you whether the pipe is coated, bellied or cracked. It also shows where the pipe joins the main line, which is where many kitchen clogs start.
A short camera visit costs less than repeated cabling, and it tells you whether the problem is maintenance or repair. See our sewer inspection page for how it works.
What To Tell The Plumber When You Call
Describe how long the sink has been slow, whether it happens every time or only after dishes, and whether the dishwasher or disposal is involved. Mention any gurgling from other drains and any smell.
Those details let the dispatcher guess whether the plumber needs a small hand tool or a machine. A good description can save a second trip.
Why Chemical Cleaners Often Disappoint
Many people reach for a bottle first. Liquid openers work on hair and soap, not on grease coating a pipe wall farther down. They can also pool above a partial clog and sit against your fittings for hours.
If a first dose does not help, a second dose will not either. A cable or a camera visit finds the real cause, and it avoids a bottle of corrosive liquid sitting in a pipe. Ask the plumber what you can safely pour in the meantime, and the answer is usually nothing at all.
Trap and vent rules in the National Standard Plumbing Code Illustrated, 2021 edition, explain why a kitchen drain needs air behind the water to run freely.
Habits That Help
Wipe greasy pans with a paper towel before washing, and use a strainer in the drain. Flush with hot water for a minute after washing dishes, and keep fat out of the sink. These steps lengthen the time between cleanings.
We serve North Brunswick, East Brunswick and Edison.
Local questions answered
A cable opens a channel but may leave residue. Jetting cleans the wall, and a camera may show a belly.
It helps briefly, but the grease can solidify again further down.
It shares the branch line, so a partial blockage affects both.
Call the township water and sewer office. If only your house is affected, call a plumber.
We advise against it. It rarely clears grease and is hazardous for the next person who works on the pipe.
Ready to talk to a plumber? The line is open all day and all night.
☎ Call (732) 466-1098