Hot grease goes down a kitchen sink as a liquid. A few feet into the drain it cools, turns soft and sticky, and coats the pipe wall. Food particles, coffee grounds and rice catch in that coating, more grease sticks to them, and over time the opening shrinks until the sink drains slowly or stops. Dish soap and hot water move the grease a little further down the line but rarely carry it all the way out.
In many Cypress homes the kitchen branch runs under the slab to join the main drain, sometimes over a fairly long horizontal run. Long, flat runs and older cast-iron pipe with rough interiors give grease more places to settle.
Signs the clog is in the kitchen line
What you can try safely
Stop if any step makes things worse or water starts appearing somewhere else.
- Stop adding water.Turn off the dishwasher and do not keep running the tap hoping it will push through.
- Check the basket strainer and disposal.Clear food from the strainer. If you have a disposal, cut power at the switch before checking it, and never put a hand inside.
- Plunge with the other side sealed.On a double sink, seal the second drain with a wet cloth or stopper so the plunger's pressure goes toward the clog instead of out the other basin.
- Clean the trap if you are comfortable.With a bucket underneath, the P-trap can be loosened and emptied. Many kitchen clogs, though, are further down the line than the trap.
- Leave the chemicals on the shelf.Drain openers poured into standing water rarely reach a grease plug in the line, and they make the sink hazardous for whoever clears it next.
Cabling vs. jetting a kitchen line
Both are common for kitchen grease. Which fits depends on how much buildup there is and the condition of the pipe.
Drain machine cable
- Punches a path through the grease plug and restores flow
- Works from the sink, a wall cleanout or the trap arm
- Leaves much of the grease coating on the pipe walls
- A reasonable first step for an occasional clog
Hydro jetting
- Scours grease from the full circumference of the pipe
- Better suited to lines that clog again within months
- Needs a pipe sound enough to handle the pressure
- Often preceded by a camera check on older cast iron
Keeping a kitchen line clear
Questions for the plumber
- Where are you planning to access the line: the sink, a cleanout or the roof vent?
- Is this a one-time clog or does the line look like it needs a full cleaning?
- Would you recommend jetting, and would you check the pipe with a camera first?
- Is the dishwasher drain connection part of the problem?
Common questions
Does boiling water clear a grease clog?
It may soften grease near the sink briefly, but the grease usually resettles further down the line. It is also a scald risk, especially in a sink full of standing water.
Why does my kitchen sink clog every few months?
A cable opens a path but leaves grease on the pipe walls. If clogs keep returning, ask about jetting the line after a camera check.
Can the kitchen clog be in the main line?
Yes. If bathrooms also drain slowly or gurgle, the blockage may be downstream in the main drain.
General information for Cypress, not a quote or professional advice. In an emergency, call 911.