Cost GuideUpdated June 16, 2026
A garbage disposal leaking underneath the sink can catch any homeowner off guard. In Burbank's single-family homes, most kitchen sinks are decades old, and disposal units see a lot of use. Even the toughest disposals eventually spring a leak, especially where clay soil and older cast iron or galvanized drains put more stress on connections. Ignoring a leak under your sink can cause water damage to cabinets and floors and allow mold to form fast in our humid summers. Our crew will walk you through what causes these leaks, what you should do, and what's usually involved in fixing or replacing a leaking disposal in a Burbank house.
Common Causes of Leaks Under a Garbage Disposal
Most leaks show up as water collecting or dripping from the base of the disposal or around the connections. In mid-century ranches and split-levels around Burbank, we run into these usual suspects:
- Failed sink flange seal where the disposal mounts to the drain
- Cracked or rusted disposal housing from age or corrosion
- Loose drain pipe or dishwasher connection
- Worn-out internal seals around the motor or reset button
If your disposal is leaking from the very bottom, it's often a sign that internal seals have failed. Leaks from where the unit meets the sink or where the pipes connect typically come from loose bolts or dried-out plumber's putty.
What to Do First if You Spot a Leak
If you discover a puddle or dripping under your disposal, take a few steps right away to limit water damage and figure out where it's coming from:
- Turn off the disposal and unplug it to prevent electrical hazards
- Dry the area and check if water leaks right away or only when you run the sink
- Look at the top mounting ring, side outlet, and bottom of the unit for the source
- Inspect drain hoses and the dishwasher connection for cracks or loose clamps
- If the leak is steady or sewage-smelling, it might mean a bigger drain issue, see our drain cleaning page
Many homes in Burbank still have older cast iron or galvanized drain pipes, which can corrode and worsen leaks at threaded joints. Flat kitchen floors and heavy clay soil in our area also mean water can travel out of sight under cabinets, leading to hidden damage.
Repair or Replace? How Plumbers Decide
Whether your disposal can be repaired or needs a full replacement depends on the location and severity of the leak:
- If only the sink flange or drain connection is leaking, our team often reseals with fresh plumber's putty, tightens mounting bolts, or swaps a gasket
- If the housing or base is wet, it usually means the internal seals gave out, these aren't serviceable on most residential units, so a replacement may be the best fix
- Units over 8-12 years old, especially with rust or repeated jams, don't make sense to patch up again
We always check the nearby piping. If the drain lines under the sink are old galvanized or cast iron, we'll look for corrosion or slow draining. That can point to bigger issues, and we may recommend pipe repair or repiping if leaks keep returning.
Typical Costs What Burbank Homeowners Should Expect
The price for fixing a leaking disposal depends on what's wrong. Resealing a flange or tightening a hose clamp is the lowest cost. If the whole unit needs replacement, the cost covers the new disposal unit and installation. Homes with trickier setups, like double sinks, hard-to-reach cabinetry, or older/nonstandard plumbing, sometimes run a bit higher on labor. If we find old galvanized drains that are leaking or clogged, that can increase costs for repair or replacement. We always give options and explain each part needed.
Unlike some jobs, garbage disposal work isn't just about the unit, it's about making sure the sink, trap, and all connections are solid. If there's an issue with the P-trap or if you notice slow draining, it can help to check our drain cleaning and leak detection and repair services as well.
Preventing Future Leaks and Water Damage
Once we've fixed or replaced your disposal, a few simple habits can keep leaks from coming back:
- Run cold water before, during, and after food goes into the disposal
- Don't pour grease or oil down the drain, as these clog and corrode pipes and seals
- Watch for early warning signs, like small puddles, musty smells, or slight dampness under the sink
- If your disposal hums but won't turn, stop using it and call us, this keeps water from backing up and leaking out
Basements in Burbank homes are prone to moisture because of our heavy clay soils and high water table. Even small leaks upstairs can add to basement dampness. Make sure to check your sump pump is working, especially after a disposal leak that's gone unnoticed for a while. Our sump pump services can help if you suspect water issues in your lower level.
When to Call a Professional
Some minor leaks are caused by loose hose clamps or aging putty and can be handled with a wrench and some new seals. But if water is coming from the underside of the unit, or you see rust or corrosion on the body, it's time to call a licensed plumber. Our crew at My Burbank Plumbers is set up to handle both old and new disposal models, including working around tight cabinets and older drain systems common here.
If the leak is part of a bigger problem, like ongoing kitchen drain backups, slow draining, or your disposal tripping the breaker, don't wait. These signs can point to root intrusion, aging pipes, or even a sewer line issue needing professional sewer line service.
If you're dealing with a leaking garbage disposal or worried about water under your kitchen sink, our team is ready to help. Call 708-847-4987, and we'll walk you through your options and get your Burbank kitchen back in shape.