The Complete Homeowner's Guide to Garbage Disposals: Cleaning, Fixing, Replacing, and Everything to Know

Your garbage disposal is one of those appliances you never think about — until it hums, jams, leaks, or quits entirely, usually with a sink full of dishes. This guide is meant to be the one place you can come back to for any disposal question: how it works, what you can and can't put in it, how to clean it, how to fix the common problems yourself, when it's time to replace it, and what all of that costs here in Florida. Bookmark it, and jump to whatever you need.

In this guide

• How does a garbage disposal actually work?
• How long does a garbage disposal last?
• What can you put down a garbage disposal?
• What should you never put in a garbage disposal?
• Can you put egg shells in a garbage disposal?
• Can you put coffee grounds in a garbage disposal?
• How do you clean a garbage disposal?
• Why is my garbage disposal not working?
• Where is the reset button on a garbage disposal?
• How do you reset a garbage disposal?
• How do you unclog a garbage disposal?
• How do you unjam a garbage disposal?
• Why is my garbage disposal leaking?
• When is it time to replace a garbage disposal?
• How much does a new garbage disposal cost?
• How much does it cost to install a garbage disposal in Florida?
• Can you install a garbage disposal yourself?
• Can you have a garbage disposal with a septic tank?
• When to call People's Choice Plumbing

How does a garbage disposal actually work?

A garbage disposal is a motor-driven grinding unit mounted under your kitchen sink that shreds food scraps into tiny particles so they can wash safely down the drain with water. There's a common myth that it works like a set of spinning blades — it doesn't.

Inside the disposal is a grinding chamber with a spinning metal plate at the bottom (the flywheel) fitted with two blunt swiveling lugs called impellers. When you run water and flip the switch, the motor spins the plate fast, and centrifugal force flings the food scraps outward against a stationary grind ring on the chamber wall. The impellers and ring pulverize the food into a slurry small enough to flow through your plumbing. Nothing is sharp — it's force and abrasion, not cutting. That's why running plenty of cold water is essential: it carries the ground particles all the way through the drain line instead of letting them settle and clog.

How long does a garbage disposal last?

A garbage disposal typically lasts 8 to 12 years, though heavy use or hard water can shorten that. Here in Palm Beach and Martin County, our hard water works against the low end of that range — mineral scale and corrosion wear on the internal components over time, the same way they age water heaters and fixtures.

You can stretch a disposal's life by running cold water every time you use it, grinding food in small batches rather than stuffing it full, keeping the "never" list below out of it, and cleaning it monthly. When a unit starts needing frequent resets, leaks from the bottom, or simply stops grinding effectively, it's usually reached the end of its service life rather than needing a repair.

What can you put down a garbage disposal?

A garbage disposal handles most soft, biodegradable food scraps well. Safe items include:

• Soft fruit and vegetable scraps
• Cooked leftovers (in small amounts)
• Small scraps of meat
• Citrus rinds (in small pieces — they also help freshen the unit)
• Ice cubes (which actually help knock buildup loose)

The golden rules: run cold water before, during, and for a good 15–20 seconds after grinding; feed food in small batches; and never treat the disposal as a trash can. It's designed for incidental scraps left on plates, not for disposing of large quantities of food.

What should you never put in a garbage disposal?

Plenty of common kitchen waste damages a disposal or clogs the drain. Never put these down it:

• Grease, oil, and fat — they solidify in the pipes downstream and cause stubborn clogs.
• Fibrous vegetables — celery, corn husks, artichokes, onion skins; the stringy fibers wrap around the impellers.
• Starchy foods — potato peels, pasta, and rice expand with water and turn to paste that gums up the works.
• Coffee grounds — they accumulate and combine with grease into a sludge (more below).
• Egg shells — the thin membrane can wrap the impellers and the grit doesn't help "sharpen" anything (more below).
• Bones and fruit pits — too hard; they'll jam or damage the unit.
• Non-food items — produce stickers, twist ties, paper, and the like.

When in doubt, throw it in the trash or compost. The disposal is for scraps, not bulk food waste.

Can you put egg shells in a garbage disposal?

No — despite the popular myth, egg shells are not good for your disposal. The idea that shells "sharpen the blades" is doubly wrong: disposals don't have blades, and the thin membrane on the inside of the shell can come loose and wrap around the impellers or lodge in the drain. The gritty shell fragments also settle in the pipes and contribute to buildup. Toss egg shells in the trash or compost instead.

Can you put coffee grounds in a garbage disposal?

No. Coffee grounds seem harmless because they're small, but they behave like fine sediment — they accumulate in the drain line and combine with grease to form a dense, stubborn sludge that's a common cause of clogs. A little now and then won't destroy anything, but as a habit, keep grounds out of the disposal. Compost them or throw them away.

How do you clean a garbage disposal?

Cleaning a disposal removes the food film and odor-causing buildup that collect over time. You should do it about once a month. Three methods that work well:

Baking soda and vinegar (best for odor and light buildup):

• Pour about 1/2 cup of baking soda into the disposal.
• Add 1 cup of white vinegar and let it fizz for 5–10 minutes.
• Flush with hot water while running the disposal for a few seconds.

Ice and rock salt (best for knocking loose the gunk on the grind components):

• Drop a couple of cups of ice cubes into the disposal.
• Add about 1/2 cup of rock salt (or coarse salt).
• Run the disposal with cold water until the ice is gone — the ice scours the chamber.

Citrus peel (best for a fresh smell):

• Run cold water and the disposal.
• Feed in a few small pieces of lemon, lime, or orange peel.
• The oils leave the unit smelling clean.

For routine freshness, the citrus trick after cooking is easy; for a real cleaning, do the baking-soda or ice-and-salt method monthly.

Why is my garbage disposal not working?

When a disposal stops working, it's almost always one of two problems, and both are usually fixable in minutes:

• It hums but doesn't spin — the unit has power but the grinding plate is jammed by something stuck between the impeller and the ring. Turn it off right away (running a jammed motor overheats it) and see how to unjam it below.
• It won't turn on at all — no hum, nothing — the motor has tripped its internal overload protection and needs a reset, or a breaker has tripped. See the reset steps below.

A third, rarer case: if it's completely dead and the reset button and breaker are both fine, the motor may have failed, which usually means replacement. But try the reset and unjam steps first — they solve the large majority of "dead" disposals.

Where is the reset button on a garbage disposal?

The reset button is on the bottom of the unit, usually in the center, and it's typically a small red button about the size of a pencil eraser (some models use a black button, and a few put it on the side). You'll need to reach under the sink and feel around the underside of the disposal to find it.

In a lot of Palm Beach-area homes with tight under-sink cabinets, the disposal is wedged in behind the P-trap and supply lines, so a flashlight and a few seconds of feeling around the bottom center is the fastest way to locate it. If the button is already pushed in (retracted flush) but the disposal is dead, that's your sign the overload tripped.

How do you reset a garbage disposal?

Resetting a disposal takes about a minute:

• Turn the disposal switch off so it can't start unexpectedly.
• For safety, unplug the unit or switch off its breaker before reaching underneath.
• Reach under the sink and find the red reset button on the bottom center of the unit.
• Press it gently until it clicks and stays in. If it was tripped, it will hold; if it pops back out, let the motor cool for 10–15 minutes and try again.
• Restore power, run cold water, and flip the switch to test.

If it resets and runs, you're done. If it immediately trips again, or just hums, the unit is jammed rather than simply overloaded — move to unjamming.

How do you unclog a garbage disposal?

A clogged disposal either drains slowly or holds standing water in the sink. Here's how to handle both:

If the sink has standing water:

• Never reach into the disposal with your hand.
• Turn off power to the unit at the switch (and ideally the breaker).
• Bail out most of the standing water with a cup.
• Use a sink plunger over the drain — a few firm plunges often dislodge the clog.
• If plunging doesn't work, the clog is likely in the P-trap under the sink. Place a bucket underneath, unscrew the trap, and clear it out, then reassemble.

If it's draining slowly (no standing water):

• Turn off power to the unit.
• Check the disposal chamber with a flashlight for anything lodged in it and remove it with tongs or pliers.
• Run cold water and short bursts of the disposal to clear the line.

One important rule: skip the chemical drain cleaners. They're rough on the disposal's components and pipes and often don't work on a food clog. If the clog keeps coming back, the problem may be downstream in the drain line, not the disposal itself — see when to call a plumber.

How do you unjam a garbage disposal?

If your disposal hums but won't spin, something is jamming the grinding plate. Safety first: always cut the power before doing anything inside the unit — never put your hand into a disposal.

• Turn off the disposal and switch off its breaker or unplug it.
• Look for the small hex (Allen wrench) socket in the center of the bottom of the unit. Most disposals include a 1/4-inch Allen wrench for exactly this; if yours is missing, any 1/4-inch hex key works.
• Insert the wrench into the socket and work it back and forth to manually rotate the plate and free the obstruction.
• Alternatively (or in addition), from the top, use a wooden spoon handle or a broom handle to gently push against the impellers and rock the plate free — never your hand, and never a metal utensil.
• Once it turns freely, remove whatever was stuck (with tongs, from the top), restore power, press the reset button, run cold water, and test.

If it still won't spin after freeing the jam and resetting, the motor may be failing.

Why is my garbage disposal leaking?

A leaking disposal is leaking from one of three places, and where it leaks tells you how serious it is:

• The top (sink flange): the mounting seal where the disposal meets the sink has loosened or the plumber's putty has failed. Often re-sealable — usually the least serious.
• The side (dishwasher inlet or drain connection): a loose hose clamp or a failed gasket at the dishwasher hose or drain pipe connection. Usually a fixable connection or gasket.
• The bottom of the unit: this is the one to worry about. A leak from the bottom almost always means the internal seals have failed and water is getting into the motor housing — that's not repairable, and the disposal needs to be replaced.

If you spot a leak, turn off the unit and dry the area so you can see exactly where the water is coming from before deciding whether it's a quick fix or a replacement.

When is it time to replace a garbage disposal?

Replace the disposal — rather than repair it — when you see any of these:

• It's leaking from the bottom (failed internal seals).
• It's 8–12+ years old and giving you recurring trouble.
• It frequently jams or needs resetting even with proper use.
• It grinds poorly or is noticeably louder or weaker than it used to be.
• It's completely dead after you've checked the reset button and breaker.

Disposals are affordable enough that once one starts failing repeatedly, replacement is usually the better spend than chasing repairs — much like a water heater near the end of its life.

How much does a new garbage disposal cost?

Garbage disposals come in three broad tiers by the unit alone:

• Budget (1/3–1/2 HP): about $80–$150. Fine for light use in a small household.
• Mid-range (1/2–3/4 HP): about $150–$300. The sweet spot for most families — more grinding power and quieter.
• Premium (3/4–1+ HP): about $300–$500. Most powerful, quietest, and best for heavy use; many septic-safe models live here.

A more powerful motor grinds tougher scraps with less jamming and tends to last longer, so if your old unit struggled, stepping up a tier is often worth it.

How much does it cost to install a garbage disposal in Florida?

Professional labor to install a disposal typically runs $150–$300, and the all-in cost (unit plus installation) usually lands between about $250 and $800, depending on the disposal you choose and the complexity of the job. Replacing a like-for-like unit on existing wiring and plumbing is at the lower end; a first-time install that needs new electrical, a switch, or drain reconfiguration costs more.

Overall garbage disposal repairs, when a unit is worth fixing, generally run $100–$350. If a repair approaches the cost of a new unit installed, replacement is the smarter choice.

Can you install a garbage disposal yourself?

Technically, yes — a like-for-like replacement on an existing setup is a manageable DIY job if you're comfortable working under the sink and with a basic electrical connection. You disconnect the old unit, mount the new one to the existing sink flange, reconnect the drain and dishwasher hose, and wire it to the existing circuit.

Call a licensed plumber when:

• There's no existing disposal or wiring (a first-time install needing new electrical and a switch).
• The drain plumbing needs reconfiguring to fit the new unit.
• You're unsure about electrical connections or permits — new electrical work may require a permit in Palm Beach and Martin County.
• You want it done quickly and warrantied, without troubleshooting leaks afterward.

The stakes with a disposal are water under the sink and an electrical connection, so if any part of it feels uncertain, it's worth having it done right.

Can you have a garbage disposal with a septic tank?

Yes, but with care — and this matters for a lot of homes in our area, since much of Martin County and rural Palm Beach County is on septic rather than city sewer. A disposal sends ground food particles into the septic tank, where bacteria have to break them down along with everything else. Because food waste adds to the solid load, a disposal can increase the solids entering the tank meaningfully and cause sludge to build up faster — which means you may need to pump the tank more often.

If you're on septic and want a disposal, a few practical steps keep it from overloading the system:

• Choose a septic-safe disposal, some of which add enzymes to help break down food waste.
• Use it sparingly — scraps, not bulk food.
• Be strict about the never list, especially grease and fibrous foods.
• Stay on top of regular septic pumping — and expect to pump a bit more often than a home without a disposal.

If you're not sure whether you're on septic or city sewer, our septic tank guide explains how to tell and how to care for the system.

When to call People's Choice Plumbing

Most disposal problems — a reset, a jam, a monthly cleaning — you can handle yourself with this guide. It's worth calling a professional when:

• The disposal is leaking from the bottom or needs replacing.
• You need a new install that involves electrical or drain work.
• The same clog keeps coming back — the real problem may be the drain line, not the disposal (our guide on why a shower drain backs up explains when a clog is actually a deeper issue).
• Multiple drains are slow or backing up, which can signal a main-line problem worth a sewer camera inspection.
• You'd simply rather have it fixed right the first time.

People's Choice Plumbing repairs, replaces, and installs garbage disposals across Jupiter, Palm Beach Gardens, Tequesta, North Palm Beach, Juno Beach, Hobe Sound, Stuart, Palm City, and Jensen Beach.

Request garbage disposal service or contact our team today.