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Kitchen plumbing: the sink, the disposal, the drain line and the water under it

Kitchen plumbing problems cluster around one drain line: the sink, the garbage disposal and the dishwasher all share it, and grease coats it. The fix depends on whether the problem is the fixture, the disposal or the line.

Tier
Learn
Reviewed by
Dee Alkouri
Updated
2026-09-28
Lic
CSLB #998069

//Quick answer

  • Grease is the kitchen line's enemy; snaking punches through it, jetting removes it.
  • A humming or leaking disposal is a repair or a swap, not a drain problem.
  • Reverse osmosis at the kitchen tap is the drinking-water treatment that fits here.
  • Fixture pricing is not published; drain snaking starts at $99 with camera.

01Definition

What is actually plumbed in a kitchen?

Hot and cold supply to the faucet, a branch to the dishwasher, sometimes a line to the refrigerator, a garbage disposal on the sink drain, a P-trap, and a drain arm into the kitchen line that runs to the main. Optionally a reverse osmosis system under the sink with its own faucet and drain connection.

What goes wrong most often?

A slow or stopped sink, which is grease in the line more often than anything else. A disposal that hums, trips its reset, leaks at the flange or will not turn. A faucet that drips or has lost pressure at the aerator. A dishwasher that will not drain because the disposal's knockout plug was never removed or the drain line loops wrong. And a leak under the sink from a supply line, a trap joint or the disposal body.

02When it applies

When is it a drain call?

When the sink drains slowly or backs up and the disposal itself runs fine. Snaking clears it for a while; if the line is coated in years of grease, hydro jetting at $650 to $850 cleans it for good. The camera shows which. Drain snaking starts at $99 with the camera inspection included on a qualifying drain.

When is it a disposal or fixture call?

A disposal that hums is jammed; a disposal that leaks from the body is done. A faucet drip is usually a cartridge. A dishwasher that will not drain is usually a disposal or air-gap problem. Done-Rite repairs and installs disposals and installs Moen and Kohler faucets, customer-supplied or crew-supplied.

What can you safely try first?

Press the disposal's reset button and clear a jam with the wrench slot underneath, with the power off. Clean the faucet aerator. Check the dishwasher drain loop. Do not pour chemical drain opener down a kitchen line; it sits against the pipe wall and rarely clears grease.

03What goes wrong

What does a kitchen leak do if it is ignored?

It rots the cabinet floor, then the subfloor, quietly. A supply line drip or a weeping trap joint under a sink full of cleaning products is easy to miss for months. Look under the sink once a month; it takes ten seconds.

04Proof

  • A camera goes down the line before anyone quotes a drain or sewer repair, and the camera inspection is included with the $99 drain snaking.
  • Jason Shen, Google, September 16, 2026: "Daniel did an excellent job installing my whole house carbon filtration and water conditioning system. He also flushed out my tankless water heater."
  • No trip charge, a 1-hour response time, and 24/7 emergency service.
  • 1 year minimum warranty on labor. Manufacturer warranty handling varies by manufacturer.

05Action

Get the kitchen sorted

Drain snaking from $99 with camera inspection, hydro jetting $650 to $850. Disposal, faucet and reverse osmosis work is quoted on site; call for pricing. No trip charge.

No trip charge · 1-hour response · 24/7 emergency service · CSLB #998069

//Keep going

//Terms used in this guide

Where this applies

Done-Rite runs these calls across Orange County from its shop in Anaheim, CA, with no trip charge in any city it serves.

Common questions

Grease, usually. A cable punches through it and it closes back up; hydro jetting scours the line clean. The camera shows which one your line needs.

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