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Kitchen Plumbing: A Homeowner's Guide

From a dripping faucet to a full sink relocation, here's how kitchen plumbing works and where it tends to go wrong.

The short answer

Kitchen plumbing covers your sink, faucet, supply lines, drain, garbage disposal, and the connections for your dishwasher and fridge water line. Most issues are repairable; bigger projects (a new sink location or a remodel) involve drain, vent, and supply work that should be done to code.

Reviewed by Odari M. Head, Georgia State Master PlumberUpdated June 23, 20266 min read

What's in your kitchen's plumbing?

The kitchen packs a lot of plumbing into one cabinet: hot and cold supply lines, the faucet, the sink drain and P-trap, often a garbage disposal, the dishwasher's supply and drain, and frequently a water line to the refrigerator's ice maker. Each is a potential point of leaks or clogs.

What commonly goes wrong?

The kitchen issues we see most:

  • Dripping or stiff faucets — usually a worn cartridge, not a dead faucet
  • Slow or clogged drains — grease and food are the usual culprits
  • Garbage disposal jams, leaks, or hums
  • Leaks under the sink from supply lines, the P-trap, or the disposal connection
  • Dishwasher or ice-maker line leaks — small drips that cause big cabinet damage over time

Remodeling or moving the sink? What to plan for

Relocating a sink or adding an island means new drain, vent, and supply runs — real plumbing work that typically needs a permit. Getting the drain slope and venting right is what keeps a remodeled kitchen draining well and odor-free for decades; this is the part DIY remodels most often get wrong.

Add shutoffs and quality valves now

A remodel is the ideal time to add accessible shutoff valves and choose serviceable faucet and disposal brands, so future repairs are quick and cheap.

What's the honest cost reality?

A faucet or disposal swap is a quick, modest job; a drain reroute or sink relocation in a remodel is a larger one. Exact pricing depends on access, fixtures, and what's behind the cabinet, so we give a flat-rate price up front after seeing the job — never a fabricated number over the phone.

What's the next step?

Whether it's a stubborn clog, a leak under the sink, or a full remodel rough-in, we'll diagnose it, quote it flat-rate, and do it to code. Request service online or call and we'll usually be out the same business day.

Common questions
  • Grease and food buildup coating the pipe walls is the usual cause. A thorough cleaning (sometimes hydro jetting) clears the whole pipe, not just a hole through the clog. Avoid pouring grease down the drain to prevent repeats.

Terms in this guide

P-trap
The U-shaped bend under sinks, tubs, and showers that holds a small amount of water to block sewer gas from entering your home. A dry or missing P-trap is a common source of drain odor.
Faucet cartridge
The replaceable valve inside a modern faucet that controls flow and temperature. Cartridge design varies by brand, which is a big reason brand choice affects how easy — and how cheap — a faucet is to repair years later.
Hydro jetting
A drain-cleaning method that uses high-pressure water (often 1,500–4,000 PSI) through a specialized nozzle to scour grease, scale, and roots off the full inside wall of a pipe — far more thorough than a cable snake, which only punches a hole through the clog.
See the full plumbing glossary
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