Start with one question: is the house on a septic system or a municipal sewer? The answer decides the rest. On septic, plan the kitchen so it doesn’t depend on a garbage disposal, because the U.S. Environmental Protection Agency (EPA) tells septic homeowners to eliminate or limit its use. On a sewer, the septic concern doesn’t apply, and the choice comes down to cabinet space, power and scrap habits. Either way, settle the garbage disposal and septic system question while the plan is still on paper.

That timing matters. The sink base, meaning the cabinet under the sink, is drawn with the rest of the cabinet plan, and so is the power that serves it. Add or drop a disposal after the kitchen is built and you can end up reworking the cabinet interior or the wiring. And on a septic system, EPA says that if you must use a disposal, the tank will need to be pumped more frequently.

It looks like an appliance choice. It’s really a cabinet decision, and in a kitchen remodel the cabinet decisions come early. So this one gets settled on paper.

Can You Have a Garbage Disposal With a Septic Tank?

EPA’s guidance to septic homeowners is to eliminate or limit the use of a garbage disposal. It also says that if you must use one, your tank will need to be pumped more frequently. So this isn’t a flat no. And it isn’t neutral either.

The reasoning is plain in EPA’s telling. Everything that goes down your drain ends up in your septic system, and that includes what you grind in a disposal. EPA says limiting a disposal significantly reduces the fats, grease and solids that enter the tank and could clog the drainfield. The drainfield is the part of a septic system that removes contaminants from the liquid leaving the tank.

EPA makes the same point from another angle. Food waste can add an unnecessary amount of solid material to the tank. And an in-sink disposal can affect how often the tank needs pumping. More solids in, more attention to the tank.

You can read the EPA’s guidance on caring for a septic system yourself. The page addresses septic homeowners directly.

EPA’s advice to eliminate or limit is guidance about use, not about cabinetry. It lands in the cabinet plan anyway. A kitchen built around a disposal expects scraps to go down the drain. A kitchen planned the other way hands that job to a bin, and gives the disposal’s cabinet space to something else. You’re choosing which of those two kitchens gets drawn.

One limit is worth saying out loud. That’s general homeowner guidance. It isn’t a finding about your tank, your drainfield or any particular model. So ask the septic professional who services your tank how a disposal would affect it, and ask before one goes into the plan. A design conversation can’t answer that question. A septic professional can look at what you actually have.

What a Disposal Asks of the Sink Base

A disposal sits under the sink bowl. So as a general rule it shares the sink base with the drain plumbing and with whatever else you wanted down there. A pull-out bin for trash or recycling. Cleaning supplies. The dish soap you buy a jug of at a time. That cabinet gets crowded, and the disposal body takes up part of it.

A disposal also needs power. As a general rule that means an outlet or wiring under the cabinet, plus a switch somewhere you can reach. The switch location matters. It’s something you reach for at the counter, so where it lands is a design decision. Your electrician and your designer should settle that on the plan.

There’s a second effect worth naming. The space a disposal takes is space a pull-out bin wanted. So the sink base question isn’t really disposal or no disposal. It’s a disposal versus whatever else you’d keep under there. It’s worth asking your designer to lay out both versions of that cabinet before anything is ordered.

Both of those pieces live in the cabinet plan: the interior of the sink base, and the power that serves it. That’s why this decision belongs before the cabinets are ordered. Add a disposal afterward and you can be reworking the cabinet interior or the wiring. Drop one afterward and you may have given up storage you could have planned for.

This is a custom cabinetry planning question. McDaniels designers help you design customized storage accessories for your kitchen and bath cabinetry so your essential items stay organized, and the sink base is one of the cabinets that planning can cover.

It’s the same point McDaniels makes about planning under-cabinet lighting before the cabinets go in. The wiring belongs in the plan, not in a conversation after the cabinets are hung.

Where Do Food Scraps Go Without a Disposal?

Into the trash or a lined bin under the sink. Into a countertop container you empty on a regular rhythm. Or onto a compost pile, if your household composts. None of those needs plumbing. Each one asks for something different from the kitchen plan, which is why it belongs in the drawing.

  • A countertop container. It asks for a landing spot on the counter, in reach of where you prep and clear of the sink itself.
  • A pull-out bin in the sink base. It asks for the cabinet interior to be planned around bins rather than around a disposal body, so the bin and the drain plumbing aren’t fighting for the same room.
  • A compost pile. It asks for a container you can carry and a trip outdoors, so the path from the sink to the door is part of the plan.

Pick the one your household will actually keep up with. A plan built around a habit nobody follows doesn’t hold up. Then tell your designer, because that’s what the sink base gets built around.

McDaniels’ guide to kitchen cabinet storage solutions covers pull-out cabinets for trash and recycling bins among its storage options.

How to Decide for Your Kitchen

If you’re on a septic system, plan the sink base so the kitchen works without a disposal. Give that space to a pull-out bin and let the scrap habit live there. If you still want the option, ask your septic professional first, then plan the power so the option stays open on the drawing rather than closed by it.

If you’re on a municipal sewer, EPA’s septic guidance doesn’t describe your home. The decision turns back into a plain kitchen question: cabinet space, power and how your household handles scraps. It’s also worth asking your city or township utility whether it has any guidance on food waste going down the drain. Ask the question rather than assume the answer.

If you’re not sure which one you have, find that out first. Your city or township utility can tell you whether your address is connected to a municipal sewer. Everything else here depends on that answer. It’s not a loose end to carry into a cabinet order.

And one honest tradeoff. Skipping a disposal means every scrap has to go somewhere else, by hand. That’s a habit change, and the sink wall should be planned for it instead of against it.

Bring the Septic-or-Sewer Answer to the Design Table

Settle septic or sewer first. Then bring that answer and your sink wall to a designer while the plan can still change.

At McDaniels’ Lansing showroom you can meet a designer to discuss your plans, and that designer works with you to coordinate the cabinets, plumbing fixtures, appliances and more. So the sink wall and your septic-or-sewer answer are good things to bring to that conversation. McDaniels’ experienced designers are available for complimentary consultations.

When you’re ready, book a complimentary design consultation and bring the sink wall question with you, before the cabinets are ordered.

Frequently Asked Questions

What size garbage disposal do I need?

Size is a product choice, not a design rule. The maker’s specifications give the dimensions, and the body has to fit the space your sink base actually has. Your designer can check that space on the plan before anything is ordered. Your plumber or your supplier can match a model to how your household cooks.

Do I need a garbage disposal if I have a dishwasher?

Not by itself. As a general rule a dishwasher can be plumbed with or without a disposal, so having one doesn’t call for the other. Ask your plumber how the dishwasher drain will connect in your sink base. That detail lives under the cabinet with everything else competing for the room.

Can I add a garbage disposal after the kitchen is finished?

It depends on what’s already under the sink. You need room in the sink base, and you need power there. If neither was planned, adding one can mean new wiring or giving up storage you’re already using. That’s the argument for leaving the option open on the plan even if you don’t install one now. On a septic system, ask your septic professional first.

How do I find out whether my home is on a septic system?

Your city or township utility can tell you whether your address is connected to a municipal sewer. If it isn’t, a septic professional can look at your system and explain what you have. Start there. It’s the first answer the rest of the sink base plan depends on.

Is there a septic-safe garbage disposal?

Some product pages describe models that way. EPA’s guidance to septic homeowners still says to eliminate or limit the use of a disposal, and it doesn’t treat any model as an exception to that. So before you lean on a label, ask your septic professional what a disposal would mean for your tank. That’s a question about your system, not about a product page.