Should you install a disposal at all?
A disposal grinds soft food scraps small enough to wash through the drain. It does not make the sink a trash can. Grease, coffee grounds in bulk, pasta, rice and fibrous scraps like celery still cause clogs, and a disposal adds weight to the drain line that a worn pipe may not handle well.
Check three things before you shop. Is there a switched outlet or a switch you can add under or near the sink? Does the sink have a standard 3.5 inch drain opening? Is the kitchen drain running freely now? A disposal on top of a slow drain only hides the problem until the first holiday dinner.
Pick the right size and type
| Motor size | Good for | Watch for |
|---|---|---|
| 1/3 horsepower | One or two people, light cooking | Struggles with tougher scraps and may jam more often |
| 1/2 horsepower | Most small households | A solid middle choice for everyday cooking |
| 3/4 horsepower | Families that cook daily | Heavier, so check that the sink and mounting can carry it |
| 1 horsepower | Heavy use and large kitchens | More noise and weight, and overkill for light use |
Continuous-feed models run while you hold the switch and are what most kitchens use. Batch-feed models only run with the stopper in place, which suits homes with small children. Sound insulation, stainless grinding parts and a longer warranty cost more, and they are worth it if the disposal sits next to an open living area.
The install, step by step
This is the sequence a plumber follows. Read it to decide how much of it you want to own.
Cut power and clear the cabinet
Switch off the breaker for the sink circuit, then confirm with a tester that the outlet or wires are dead. Empty the cabinet and lay down a towel.
Remove the old drain assembly
Loosen the slip nuts on the trap and the basket strainer. Scrape off old putty from around the sink opening so the new flange seats flat.
Mount the flange and ring assembly
Press plumber's putty under the flange, drop it into the sink opening, then tighten the mounting ring from below until the putty squeezes out evenly.
Prepare the unit
If a dishwasher drains into the disposal, knock out the plug inside the dishwasher port with a screwdriver and hammer. Forgetting this is the most common reason a new disposal causes a dishwasher to back up.
Hang the disposal and connect the drain
Lift the unit onto the mounting ring, rotate it until it locks, and align the discharge with the trap. Reconnect the trap with new washers, then fit the dishwasher hose.
Wire it and test
Connect the cord or the hardwired leads according to the maker's instructions, restore power, then run water and the unit for several minutes while you watch every joint.
Two parts of this list are where most do-it-yourself jobs go wrong: leaks at the flange or slip nuts, and the dishwasher knockout. Both show up a day later as a puddle in the cabinet, so we check them again with a dry paper towel before we leave.
Wiring and the outlet question
Many disposals ship without a cord, and many kitchens have no switched outlet under the sink. Adding one is electrical work, not plumbing, and the rules depend on your town. We do plumbing work: we mount the unit, make the drain connections and test it. If your kitchen needs a new circuit or switch, an electrician is the right person for that part.
If you already have a working disposal and want a straight swap, a plug-in cord often reuses the old outlet. Where the old unit was hardwired, match the connection method and do not splice by guesswork. When in doubt, stop and ask for help.
Stop signs
Do not put your hand in the chamber for any reason. Kill the power at the breaker before touching a jammed unit, even if the wall switch is off.
If the cabinet floor is soft, the pipe walls are flaking or the cabinet smells of sewage, pause the install. A disposal is not the right first fix for a failing drain.
What a North Chicago kitchen tends to hide
Local housing runs old: the typical North Chicago house went up in 1973, and roughly one in three predates 1960. Kitchens from that older third often have a steel or chrome-plated trap that is corroded or a drain tailpiece that no longer lines up with a modern disposal. In those homes we expect to replace the trap and tailpiece, not just hang the new unit.
Renters make up about two thirds of local households, many of them in apartment buildings. A tenant should not install a disposal without written permission, and a landlord should know that one more food-waste path on a shared drain stack can add clog risk for the units below. If the building has had stack problems, ask before adding a grinder.
Gurnee and Waukegan: what the local rules say
We install disposals for homeowners in Gurnee and Waukegan as well, and our trucks reach both from the 3100 Skokie Highway dispatch point. Permit habits differ between the two, so call the building office before you buy a unit.
Gurnee and Waukegan: permits and drains
The city of Waukegan publishes a plumbing page that asks for permits on every plumbing revision. Disposals are not named there, so ask the city's Building and Code Department whether a straight swap counts. Contractor registration is also part of that process.
In Gurnee, the Village maintains the local sewer lines and the North Shore Water Reclamation District treats the sewage at its Gurnee facility. The Village's water page also says its Lake Michigan supply is moderately hard, about 8 grains per gallon, so expect mineral film on a disposal's chamber and the drain flange over time. For permit rules on a disposal, call the Building Safety Division at Village Hall.
Sources: City of Waukegan plumbing page, Village of Gurnee water facts and building safety pages.
Illinois licenses plumbers through the state Department of Public Health, which runs a license lookup if you want to check a name before you hire. A licensed pro who knows the local permit steps saves you a failed inspection later.
Care and common problems after install
Habits that keep a disposal working
- Run cold water. Use a strong stream of cold water while grinding and for 15 seconds after, so fats stay solid and move through the pipe.
- Feed it in small amounts. A handful at a time works better than a bowl at once.
- Skip the problem scraps. Grease, bones, fruit pits, potato peels in bulk and coffee grounds go in the trash or compost.
- Grind ice and citrus rinds sparingly. They freshen the chamber but do not sharpen anything, despite the folklore.
If the unit hums but does not spin, it is jammed. Switch it off, cut the breaker, and use the hex socket at the bottom of the unit, or a wooden spoon handle from the top, to free it. Then press the red reset button on the underside. A unit that trips the reset again and again needs a repair visit, and our garbage disposal repair service handles that.
Not sure whether a disposal is right for your drain, or you would rather skip the cabinet contortions? Our plumbing installation crew can mount and test one, and you see a clear price before work starts.
Call (847) 281-8626Disposal install questions
A straight swap of an existing unit often takes one to two hours. A first install with a new trap, a switch or a dishwasher connection can run a half day. Add time if the sink drain is corroded or the outlet needs work.
Waukegan's plumbing page asks for permits on every plumbing revision, but disposals are not named. Call the Building and Code Department and describe the job, and ask whether a swap counts. If a permit is needed, apply before the work starts.
Not safely as a plumbing job alone. The unit needs power, which means either an outlet fed from a proper circuit or a hardwired connection to a switch. That is electrical work, so a licensed electrician should handle that step while a plumber handles the sink.
A disposal does not harm sound pipes when used with water and the right scraps. It can make an existing weakness worse, like a sagging section or a corroded trap. If your drain is already slow, fix that first.
Installs are usually booked in the daytime, and we offer same-day slots when the day has room. If a jammed or leaking disposal is flooding the cabinet, we are open 24/7 and can come out for that.
Have a plumber mount it right
If you want the disposal sealed, tested and the dishwasher port sorted, call us. You get a clear price before any work begins.
Call (847) 281-8626