Best Garbage Disposals for Septic Systems
Can you have a garbage disposal on a septic tank? Yes, with the right unit and habits. Our picks, including InSinkErator's Septic Guard, and what the EPA says about pumping more often.
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Our top picks at a glance
1 Best for septic
InSinkErator Evolution Septic Guard 3/4 HP
A quiet 3/4 HP disposal with a pump that doses a septic treatment twice a day. Read more
Pros
- Built for septic homes
- Quiet SoundSeal insulation
- 9-year in-home warranty
- Power cord included
Cons
- Septic Guard refills are an ongoing cost
- Injection pump has only a 1-year warranty
2 Most powerful
Moen Chef Series EXL100C 1 HP
About $255
A 1 HP disposal with a 10-year warranty that handles bones and dense scraps. Read more
Pros
- 1 HP motor
- 10-year warranty
- Plug-in cord included
Cons
- Bulky under the sink
- No septic treatment
3 Best budget
Waste King Legend L-1001 1/2 HP
About $90
A compact, inexpensive disposal for light use, which is what septic systems prefer anyway. Read more
Pros
- Inexpensive
- Compact and light
- Plug-in cord included
Cons
- Less power for tough scraps
- 2-year warranty
You can run a garbage disposal on a septic system. The catch is that every bit of food you grind goes into your tank as solids. The EPA’s advice is to “eliminate or limit the use of a garbage disposal,” and if you do use one, “your tank will need to be pumped more frequently.”
So the best disposal for a septic home is one you use lightly, one that grinds well, and ideally one that helps break down what you send down.
Compare at a glance
| Disposal | Motor | Septic treatment | Power cord | Warranty | Approx. price |
|---|---|---|---|---|---|
| InSinkErator Evolution Septic Guard | 3/4 HP | Yes (BOOST injection) | Included | 9 years, in-home | Check price |
| Moen Chef Series EXL100C | 1 HP | No | Included | 10 years | $255 |
| Waste King Legend L-1001 | 1/2 HP | No | Included | 2 years | $90 |
Specs and warranty terms are from manufacturers. Moen and Waste King details and prices are from This Old House's garbage disposal guide.
1. InSinkErator Evolution Septic Guard 3/4 HP: Best for septic
Who it’s for: Septic homes that want a disposal built for the job.
The Septic Guard is InSinkErator’s current septic disposal, following the older Evolution Septic Assist. It pairs a 3/4 HP Evolution disposal with a small BOOST injection pump that automatically doses a liquid Septic Guard treatment into the drain twice a day. InSinkErator says the formula helps tanks digest solids. Beyond that, it’s a full Evolution, with InSinkErator’s SoundSeal insulation to keep it much quieter than basic units. It comes with a power cord, and the disposal carries a 9-year in-home warranty.
What bugs us: You’ll keep buying Septic Guard refills, and the injection pump is only covered for a year. Septic additives are also a point of debate: the EPA’s septic care advice focuses on limiting disposal use and pumping on schedule, not treatments. If you see the older Septic Assist on sale, it uses Bio-Charge cartridges instead; check that refills are still easy to find before you buy it.
Skip it if: you rarely use a disposal. A basic unit plus good habits works fine.
2. Moen Chef Series EXL100C 1 HP: Most powerful
Who it’s for: Big households that grind more and want a strong motor.
This Old House named the Moen Chef Series its best-warranty pick. Its 1 HP, 2,800 RPM motor handles bones and dense scraps, and it has odor-reduction features. It comes with a plug-in cord and a 10-year warranty.
What bugs us: It’s bulky under the sink, and reliability reports from owners are mixed. More power doesn’t change how much food ends up in your septic tank, so use it sparingly.
Skip it if: your under-sink cabinet is crowded.
3. Waste King Legend L-1001 1/2 HP: Best budget
Who it’s for: Light users who just want to clear plate scraps.
This Old House’s budget pick is compact, light and inexpensive, with a corrosion-resistant grinding chamber and a cord included. For a septic home, light use is the goal anyway.
What bugs us: At 1/2 HP it has less muscle for tough scraps, the warranty is only two years, and the drain connection is smaller than some people expect.
Skip it if: you want a quiet disposal. Basic units are noisier.
How we chose these
We started with the EPA’s septic guidance, then compared manufacturer specs and This Old House’s garbage disposal guide, which draws on owner reviews and expert input. We focused on:
- Septic-specific features
- Motor power and grind quality
- Noise
- Warranty
- Install details, like cords and mounts
We haven’t tested these disposals ourselves. Read more about how we pick products.
Septic-safe disposal habits
- Grind less. Scrape plates into the trash or a compost bin first, and use the disposal for small scraps.
- Run cold water before, during and for a few seconds after.
- Keep out grease, oil and fat. They clog pipes and build up the scum layer in your tank.
- Skip coffee grounds, eggshells, pasta and rice. They don’t break down easily.
- Pump on schedule. The EPA says most household tanks are pumped every three to five years. With a disposal, plan on the shorter end, and have your tank inspected.
Disposal stopped spinning? Here’s what to do when a garbage disposal is humming but not spinning.
Common questions
Is a garbage disposal bad for a septic system? It adds solids, so your tank fills faster and needs pumping more often. With light use and regular pumping, many septic homes use one without trouble.
Do I need a special disposal for septic? No, but a septic-specific unit like the InSinkErator Septic Guard adds a treatment that’s meant to help the tank break waste down.
Should I use septic additives? The EPA’s septic care guidance doesn’t call for them. Regular inspection and pumping matter most.