How to Unclog a Garbage Disposal (3 Methods)

A clogged garbage disposal is one of the most common kitchen plumbing problems. The disposal hums but won't grind, water backs up into the sink, or everything just stops. Before calling a plumber, try these fixes — most clogs can be cleared in under 15 minutes with tools you already have.

Safety First

Never put your hand inside a garbage disposal. Even when off, the blades are sharp. Always turn off the disposal and unplug it (or flip the circuit breaker) before attempting any fix. Use tongs, pliers, or an Allen wrench — never your fingers.

Step 1: Reset the Disposal

Most garbage disposals have a built-in overload protector that trips when the motor is overworked. This is the first thing to try:

1. Turn off the disposal switch.
2. Find the red reset button on the bottom of the disposal unit (underneath the sink).
3. Press it firmly. You should feel it click.
4. Run cold water and turn the disposal back on.

If the reset button pops out again immediately, the disposal is still jammed. Move to Step 2.

Step 2: Manually Rotate the Blades

Something is physically stuck between the impeller blades and the grinding ring. You can free it from underneath:

1. Make sure the disposal is off and unplugged.
2. Find the hex socket on the bottom center of the disposal unit. Most disposals use a 1/4-inch Allen wrench (many units come with one; check under the sink).
3. Insert the Allen wrench and work it back and forth. You're manually turning the motor shaft to free whatever is jammed.
4. Once the wrench turns freely in both directions, the jam is cleared.
5. Use tongs or pliers to reach in and remove the dislodged object (often a bone, fruit pit, or piece of silverware).
6. Press the reset button, run cold water, and test the disposal.

No Allen Wrench?

Use a wooden broom handle or thick wooden spoon. Insert it into the disposal from the top, press it against one of the impeller blades, and try to rotate the grinding plate. Work it back and forth until it moves freely. Never use a metal utensil from above.

Step 3: Clear a Drain Clog

If the disposal runs fine but water won't drain, the clog is in the drain pipe rather than the disposal itself.

1. Turn off the disposal.
2. Use a sink plunger (flat-bottomed, not a toilet plunger). Fill the sink with 3–4 inches of water, place the plunger over the drain opening, and plunge vigorously 15–20 times.
3. If plunging doesn't work, disconnect the P-trap (the curved pipe under the sink) with a bucket underneath to catch water. Clear any debris from the trap.
4. If the clog is further down, use a drain snake (auger) to reach and break it up.

What Causes Garbage Disposal Clogs?

Understanding what causes clogs helps prevent them:

• Grease and oil: The number one cause. Grease coats pipes and hardens, trapping other debris. Never pour grease down the disposal.
• Fibrous foods: Celery, corn husks, artichokes, and asparagus have strings that wrap around the impellers.
• Starchy foods: Pasta, rice, and potato peels expand with water and form a thick paste that clogs pipes.
• Bones and fruit pits: Small chicken bones are fine, but large bones and hard pits can jam the impellers.
• Non-food items: Twist ties, rubber bands, broken glass, and small utensils are common culprits.
• Not running enough water: Always run cold water for 15–20 seconds after grinding to flush debris through the pipes.

How to Prevent Garbage Disposal Clogs

• Always run cold water before, during, and for 20 seconds after using the disposal. Cold water solidifies grease so it gets chopped up instead of coating pipes.
• Feed food slowly. Don't shove everything in at once. Small batches grind more effectively.
• Avoid problem foods: Keep grease, fibrous vegetables, starch, and eggshells out of the disposal.
• Clean monthly with ice and salt to keep the blades sharp and free of buildup. See our garbage disposal cleaning guide for 5 detailed methods.
• Run the disposal regularly even if you don't have food to grind. This prevents rust and keeps parts moving.

When to Call a Plumber

Try the DIY methods first, but call a professional if:

• The Allen wrench method doesn't free the jam
• The disposal hums but the blades won't turn at all
• Water backs up into the other side of a double sink
• You've cleared the P-trap but water still won't drain
• The disposal is leaking from the bottom (internal seal failure)
• The motor has completely stopped and the reset button doesn't help

A plumber can clear stubborn clogs with professional-grade augers and diagnose motor or seal failures. In Los Angeles, expect to pay $150–$350 for a service call, or $250–$500 if the disposal needs replacement. Browse verified plumbers near you.

Frequently Asked Questions

Can I use Drano in a garbage disposal?

It's not recommended. Chemical drain cleaners can damage garbage disposal components and corrode pipes over time. They're also ineffective against mechanical jams. Use the Allen wrench method for jams and a plunger or snake for drain clogs.

Why does my garbage disposal just hum?

A humming sound means the motor is getting power but the blades can't turn — something is jammed. Turn it off immediately to avoid burning out the motor, then use the Allen wrench method (Step 2 above) to free the jam.

How long do garbage disposals last?

Most garbage disposals last 8–15 years depending on usage and maintenance. If yours is over 10 years old and clogs frequently, replacement is usually more cost-effective than repeated repairs.

Can I unclog a garbage disposal with boiling water?

Boiling water can help dissolve grease clogs in the drain pipe, but it won't fix a mechanical jam in the disposal itself. Pour boiling water slowly after clearing a grease clog to flush remaining residue. Don't pour boiling water if you have PVC drain pipes — use very hot (not boiling) water instead.