What a disposal install actually involves
A disposal looks like a bolt-on appliance, but the install has four separate parts. The mounting flange seals to the sink drain opening, the unit hangs from a mounting assembly under the sink, the discharge tube connects to the drain trap, and the motor needs power.
Add a dishwasher and there is a fifth part. The dishwasher drain hose connects to a nipple on the disposal body, and a knockout plug inside that nipple has to be removed first. Skipping that step is a classic reason a new dishwasher backs up into the sink.
Plumbing putty or a gasket has to seal under the flange without leaking at the sink. Every one of these joints sits above a cabinet floor that absorbs a slow drip for months before anyone notices.
Plumber, handyman or electrician: who does which part
| Task | Best fit | Why it matters |
|---|---|---|
| Mounting the flange and sealing the sink opening | Plumber | A bad seal leaks into the cabinet and rots the base |
| Connecting the discharge tube and trap | Plumber | Slope and trap placement decide whether it drains or clogs |
| Connecting the dishwasher drain | Plumber | Needs the knockout removed and a proper high loop or air gap |
| Adding a new outlet or switch | Electrician | New wiring is electrical work, not plumbing work |
| Plugging into an existing outlet or cord kit | Plumber, if the setup is already there | Confirm the circuit and the switch before hiring |
Handymen often do competent small jobs, and some homeowners swap a disposal themselves. The gap shows up in the drain connection and in the permit question, where a general helper may not know the local rules. Whoever you hire, ask who is doing the drain side and who is responsible if it leaks.
How to verify a plumber's license in Utah
Utah licenses plumbers through the Division of Professional Licensing, usually called DOPL. The plumber classes are Apprentice, Journeyman, Residential Journeyman, Master and Residential Master.
Ask for the license number
A legitimate plumber can give you a license number and the name it is held under. If the answer is vague, that tells you something.
Open the state lookup
The Utah licensee lookup and verification system is at secure.utah.gov under the llv search page. It is free and does not need an account.
Search by name or number
Pick the profession PLUMBER, choose a class if you know it, then search by name or license number.
Match the person to the job
Check the status and class. An apprentice works under supervision, so ask who the supervising plumber is if an apprentice shows up.
This takes a couple of minutes and costs nothing. It also shows whether the person at your door holds the license or works for someone who does.
Want it installed correctly?
Call us about a disposal install or replacement. We will tell you what the job includes and quote a clear price before work starts.
What Riverton homeowners should know
Riverton City says a building permit is required for work on plumbing systems regulated by the code, and it takes applications by email to building@rivertonutah.gov. The city page does not spell out whether a straightforward disposal swap needs one. Ask the Riverton building department before the work starts, and ask your installer who handles it.
The state license lookup is the other local safeguard. Utah's Division of Professional Licensing lets anyone search by name or license number and filter to plumbers, so you can confirm status before a stranger opens your sink cabinet.
Sources: Riverton Building Inspections and Permits page, Utah Division of Professional Licensing license lookup
What the price depends on
Replacing versus a first install
Swapping an old unit onto an existing mount is quick. A first-time install means cutting the trap, adding fittings and sometimes changing the sink opening.
Motor size and features
Larger motors, sound insulation and continuous-feed or batch-feed designs all change the unit price and the mounting requirements.
Dishwasher connection
Hooking up or reconnecting a dishwasher adds fittings, the knockout removal and a drain loop to prevent backflow.
Existing drain condition
Corroded traps, slow sink drains or odd pipe slopes may need to be corrected so the new unit does not clog right away.
Electrical work
A switch, outlet or cord that is missing or unsuitable adds electrician scope and may add a permit step.
Disposal damage to a cabinet from a leak is rarely covered the way sudden burst-pipe damage can be, so ask your insurer how slow leaks are treated. For a real number on your sink, call us and we will price it before work starts.
Ten minutes of questions before you book
- Who holds the license?Ask for the name and class and confirm it on the state lookup.
- What is included?Ask whether the quote covers old-unit removal, the dishwasher connection and any needed fittings.
- Is a permit involved?Ask who pulls it if one is needed. Do not assume the answer.
- What happens if it leaks later?A good installer explains who returns and what the policy is in writing, without overpromising.
- Will the sink drain be tested?A proper install includes running water through the unit and watching every joint.
If the unit you already have is jammed, humming or leaking, a garbage disposal repair may cost less than a replacement. A technician can tell you which it is after a quick look.
When a disposal install turns into something bigger
Sometimes the disposal is the smallest part of the job. A remodel that moves the sink, adds an island or changes the drain layout counts as plumbing installation, which has its own planning and permit conversation.
Before any install, shut off power to the unit at the breaker and never reach into a disposal with your hand, even when it looks off. If a unit is jammed, a plumber can turn the motor free from underneath with a hex key and clear what stuck. If the housing itself drips, the usual answer is replacement, since the seals inside are not serviceable.
For a single replacement, the job usually finishes in one visit. We also take calls from South Jordan and Bluffdale, which sit on either side of Riverton, for the same kind of install.
Rules and sources behind this page
Utah licenses plumbers through the Division of Professional Licensing in classes from Apprentice to Master. Its public lookup is the standard way to confirm who you are hiring.
The plumbing side follows the plumbing code Utah adopts. Utah Code 15A-2-103 adopts the 2024 International Plumbing Code (IPC) as the state plumbing code, effective July 1, 2026, with Utah amendments on top.
Garbage disposal installation questions
Many homeowners do, and a simple swap onto an existing mount is manageable with basic tools. The risk is in the details: a poor flange seal, a skipped dishwasher knockout or a wiring mistake. If you are unsure about any of those, hire a licensed plumber.
Only if the power side needs work. If the sink already has a switch and an outlet or cord connection that suits the unit, a plumber can handle the install. New wiring or a new switch is electrical work.
A replacement onto an existing mount is often finished in one visit. A first-time install with a dishwasher connection and trap changes takes longer. We do not promise timeframes, and we will explain the scope before starting.
The knockout plug inside the disposal's dishwasher nipple may not have been removed, or the drain hose lacks a high loop. Both are simple to fix and both are part of a proper install.
Cooking grease is the big one. It coats pipes downstream and the sewer district asks residents not to pour it down drains even when they have a disposal. Fibrous scraps, bones and large amounts of starchy waste also cause problems.
The city requires a permit for work on plumbing systems regulated by the code, but its page does not address disposal swaps specifically. Ask the Riverton building department, and ask your installer who is responsible for checking.