Before you touch the old unit, unplug it or switch off its breaker, and never put a hand into the chamber, even when it is off. Installing a garbage disposal in Wyoming, MI is a job most handy homeowners can finish in an afternoon: remove the old unit, mount the new one under the sink flange, connect the drain and dishwasher line, and test for leaks.
The steps below follow that order, with the mistakes that cause most callbacks. If you hit a wiring question or a stubborn drain, a plumber is a phone call away.
Before you start: safety and supplies
Set these up first so you are not hunting for a part with the sink in pieces.
- Turn off the power at the breaker and unplug the old unit, then confirm it is dead by trying the switch.
- Never reach into the grinding chamber. Use tongs or pliers to remove anything inside.
- Gather a screwdriver, a hammer, a bucket, plumber's putty, a wrench and a flashlight.
- Check that your new unit comes with a mounting kit, a discharge elbow and a power cord, or buy a cord if not.
- Clear the cabinet under the sink and set a towel or tray to catch water.
- Take a photo of the old connections so you can match them later.
Installing the new unit, one stage at a time
Take your time with the mounting ring, because it is the part that decides whether the sink seals.
- 1
Disconnect the old disposal
Loosen the drain pipe and dishwasher hose, then twist the unit off its mounting ring. Support its weight, since it is heavier than it looks.
- 2
Remove the old flange if it leaks
Loosen the mounting ring, push the flange up through the sink and scrape off old putty. Clean the sink opening thoroughly.
- 3
Set the new flange
Press a rope of plumber's putty under the flange, seat it in the drain opening and tighten the mounting assembly from below.
- 4
Prepare the dishwasher inlet
If a dishwasher drains to the unit, knock out the plug inside the inlet with a hammer and screwdriver. Skipping this blocks the dishwasher drain.
- 5
Hang and lock the unit
Lift the disposal onto the mounting ring, align it with the drain and twist it until it locks.
- 6
Connect the drain, dishwasher and power
Attach the discharge elbow and drain pipe, clamp the dishwasher hose, then plug in the cord or have the wiring connected safely. If the unit later jams or hums, our garbage disposal repair service can help.
Permit and wiring rules for a disposal swap
Wyoming Building Inspections enforces plumbing and electrical codes separately. The drain connection follows the 2021 Michigan Plumbing Code (based on the 2021 IPC), while the wiring falls under the electrical code, so a hardwired unit may call for a licensed electrician.
Follow the manufacturer's installation instructions, and phone the city office at 616-530-7285 to ask whether your install needs a permit.
Choosing a unit that fits your kitchen
Match the unit to how you cook and what your sink can accommodate.
| Feature | Why it matters | What to look for |
|---|---|---|
| Horsepower | Affects how well it handles tougher scraps | Higher suits larger households and heavy cooking. |
| Feed type | Continuous feed runs with a switch, batch feed needs the lid in place | Batch feed adds safety around children. |
| Noise | Insulation and motor design change the sound | Look for sound insulation if the kitchen is open to living areas. |
| Mounting style | Quick-lock rings simplify installation | Match the style or use the adapter kit. |
| Cord or hardwire | Determines whether you need an outlet under the sink | Confirm an outlet exists or plan for an electrician. |
| Size | Cabinet space under the sink is limited | Measure drain height and cabinet clearance first. |
Where first-time installs go wrong
The most common mistake is forgetting to knock out the dishwasher plug. The dishwasher then fills with dirty water at the end of the cycle, and many people blame the new disposal. Check it before you attach the hose. Households in Grandville face the same trap.
The next is overtightening the mounting ring or putty seal, which can crack the plastic or distort the flange. Tighten evenly in small turns and wipe away squeezed-out putty.
Leaks at the drain trap usually come from a misaligned pipe, not a bad disposal. Dry-fit the elbow and trap arm, and adjust the angle before you tighten each slip nut. A stubborn drain or a hard-to-reach trap is where professional plumbing installation earns its keep.
Wiring is the point to stop and call
A cord into an outlet is simple. Hardwiring is different, and work on the electrical supply belongs to a licensed electrician, which our plumbing line does not cover.
If you are unsure about the wiring or the outlet, finish the plumbing and let a qualified person handle the power.
Test it before you close the cabinet
A careful test takes only a few minutes of attention and prevents a flood later.
- 1
Fill the sink and drain it
Plug the drain, fill the sink partway and let it run through the disposal. Watch every connection.
- 2
Run cold water and the unit
Turn on the cold tap, then the disposal for a short burst. Listen for rubbing or rattling.
- 3
Check the dishwasher
Run a drain cycle if you have one and look for drips at the hose clamp.
- 4
Wipe and re-check
Dry every joint with a paper towel and check again after an hour. A fresh drip shows up quickly on dry paper.
Disposal installs and permits in Wyoming, MI
Wyoming requires a plumbing permit before work starts on new construction, drain and water supply replacement, hot water heaters and adding fixtures. A disposal replacing an old one is a smaller job, but ask Building Inspections at 616-530-7285 whether your install needs a permit before you begin. A short call is cheaper than a failed inspection later.
Homeowners who live in the dwelling may apply themselves, while contractors register first and must hold the state license for the work. The city invoice is paid before the permit is issued. You can check any plumber's license on the state's LARA licensee lookup before you hire.
The city's water report lists hardness in the 140s ppm range for local Lake Michigan water, and hard water leaves scale on disposal blades and shaft seals. Running cold water during grinding and for a short while afterward helps flush the unit, which extends its life.
Questions readers ask about this job
Disposals add solids to a septic tank and can shorten pump-out intervals. Check with your septic provider first, and in Kent County ask about the program that oversees on-site systems.
The city requires permits for adding fixtures and replacing drains, so call Building Inspections at 616-530-7285 to confirm how your job is classed. Homeowners living in the dwelling can apply for their own permit.
A leak from the bottom usually points to a cracked housing or a failed seal, which means the unit is defective. Leaks at the top come from the putty or mounting ring.
Grease, coffee grounds in large amounts, fibrous peels, bones and starchy foods like rice and pasta cause clogs. Cold water and small batches help.
A simple swap is often an afternoon for a homeowner, and quicker for a plumber. A first-time install that adds an outlet, a dishwasher line or new drain plumbing takes longer.
If the job turns out to be more than a weekend project, our team handles garbage disposal repair & installation and plumbing installation, and the same 24/7 line covers Grandville and Walker.
Rather have a plumber do it?
Call (855) 575-2890 and we will schedule your disposal installation, with a clear price before work starts.