Best Garbage Disposal for Septic Tanks 2018

Best Garbage Disposal for Septic Tanks

For most Americans, having a garbage disposal under the sink is a godsend, as it allows us to throw away leftovers with impunity, rather than worrying about clogging the drain by accident because we didn’t scrape our plates well enough. Although it seems like a luxury in other parts of the world, the fact is that disposals are extremely commonplace in US households, appearing in most domiciles regardless of income. Read our full review on Best Garbage Disposal for Septic Tanks

While these devices are certainly handy and efficient at processing waste, what if your home has a septic system? Because you’re not connected to the city’s plumbing, you have limited space for waste water, which means that most houses that have a septic tank don’t use a disposal for fear of clogging the system overfilling it prematurely.

Although those concerns do have merit, the fact is that if you get a powerful and efficient disposal, you shouldn’t have to worry at all. That being said, you will need to make sure that your tank is large enough to handle some extra water, as using the disposal can be equal to one toilet flush.

With that in mind, let’s take a look at the best disposals for septic systems and see if they can help your home become more waste-efficient.

Best Garbage Disposal for Septic Tanks Comparison Chart


Product Name

Editors Reviews

Check Price and Reviews

InSinkErator Evolution Septic Assist

Waste King  L-8000

Waste King L-1001

Waste King L-3200

How to Choose the Best Garbage Disposal for Septic Tanks

Because you don’t have the same level of convenience as a home that connects directly to a plumbing system, you have to pay more attention to what comes with your disposal. You want to make sure that it is powerful enough to process all kinds of food, and you need to ensure that it doesn’t need a lot of water to work properly. Here are the top factors you should be looking at when making your decision.


Depending on how large your tank is you will need to get a disposal that accommodates that size. For example, if you have a smaller tank then you will want a disposal that isn’t too big so that you’re not flushing so much waste every time you use it. Look for compact or space-saving units that will give you the same level of processing power without having too large of a tank.


The size and speed of a motor will help you manage the waste that you put into your tank. For example, if a motor pulverizes your food at higher speeds, you will wind up creating less waste than a unit that doesn’t operate as efficiently. For septic systems, I recommend at least half a horsepower or 2600 rpm.

Septic-System Ready

​When looking at different disposal models, be sure that they say that they are compatible with septic tanks. Some units may not have this distinction, meaning that you should avoid them if possible.

In certain cases, however, the disposal will be designed for a septic tank rather than standard plumbing. In this instance, the unit will come with a bio-pack, so you get a microorganism treatment every time you operate the device. This can ultimately make your system much more efficient as it will break down matter much faster than normal.

Continuous vs. Batch Feed​

While most people prefer continuous disposals because they are more efficient and easy to use, the fact is that batch feed might be better for a septic tank. The way that this model works is that you have to seal the unit before it can operate. This way you don’t have to run the disposal every time you toss food into it, meaning that you can reduce the amount of water that goes into your tank. If you have a smaller system, a batch feed disposal may be your best option.

Best Garbage Disposal for Septic Tanks- Top Picks

InSinkErator Evolution Septic Assist Garbage Disposal

When it comes to disposal units, InSinkErator is one of the top brands. I have used this company many times, and I have to say that I am impressed with the level of quality and commitment to detail. Overall, I think that InSinkErator produces the best disposals, and the Evolution is one of the greatest for septic tanks.

What makes this model so perfect for your system is that it comes with a bio-charge pack installed. That means that you get a septic treatment every time you use the device, as it injects over 300 million microorganisms into your tank when

used. Overall, it will make your system much more efficient and could even make it better.

The other things that I like about this disposal are the powerful ¾ horsepower motor, the multi-stage grinding system, and the SoundSeal system that makes it quieter than other models. All of that coupled with the bio-charge make this one of the best disposals you can get for your septic tank.


  • ¾ horsepower motor
  • Dura-drive induction
  • 40 oz grind chamber
  • Two stages of grinding
  • SoundSeal technology for quieter operation
  • Stainless steel components
  • One bio-charge cartridge included
  • Injects 300 million microorganisms per use
  • Quick lock mounting system
  • Four-year limited warranty
  • Made in the USA


  • Power cord not included
  • May be too large for your sink

Waste King L-8000 Garbage Disposal

Another high-quality brand of garbage disposal is Waste King. While this company does not have all the bells and whistles of InSinkErator, you can usually get the same level of performance without having to shell out a ton of money. In short, if you want to stay within your budget and get something powerful, this is the way to go.

The L-8000 is one of the most robust disposals that Waste King sells, with a one-horsepower motor that operates at a blazing 2800 rpm. Using stainless steel impellers, you can chew through all kinds of food quickly and efficiently, which is why this particular unit is perfect for most septic tanks.

What I like about the L-8000 is that it comes with high-quality materials and it’s insulated to make it less noisy overall. Also, it comes with Waste King’s patented E-Z mounting system, which makes installation a breeze. Finally, this particular unit comes with a limited lifetime warranty, which means that it is built to last.


  • One-horsepower motor
  • Operates at 2800 rpm
  • Stainless steel impellers
  • Anti-jam technology
  • Insulated to reduce noise
  • E-Z mounting system
  • 36-inch power cord included
  • Rust and corrosion proof
  • Limited lifetime warranty


  • Can be loud even with insulation
  • In some cases, the flange seal may not be as tight as it should
  • While it can be used for septic tanks, it’s not as efficient as other models that are designed for it

Waste King L-1001 Garbage Disposal

Next, we have the L-1001 model from Waste King. While this unit is not as powerful as the L-8000, you still get a lot of bang for your buck. This particular model is ideal for smaller households that don’t need a supercharged system to process food. Also, if you have limited sink space, this could be your best option as it doesn’t take up a lot of room.

As far as performance goes, the L-1001 uses a ½ horsepower motor to chew through food at 2600 rpm. You still get all stainless steel components, meaning that this device is both corrosion and rust proof. What I also like about this model is that you get a removable splash guard, making cleaning a breeze.

Other features include the E-Z mounting system, insulation to reduce the noise level, and a 36-inch power cord to make the installation process much easier for you. This model also comes with a two-year limited warranty on parts and labor.


  • ½ horsepower motor
  • Operates at 2600 rpm
  • Space saving design
  • Stainless steel components
  • Removable splash guard included
  • Insulated to reduce noise
  • E-Z mounting system
  • 36-inch power cord included
  • Dishwasher and septic system ready
  • Two-year limited warranty


  • Mounting ring may not seal properly in some cases
  • Can still be louder than other models
  • While it can be used for septic systems, it’s not as efficient as other units

Whirlaway 191 Garbage Disposal

As far as disposal brands go, I have a lot of experience with InSinkErator and Waste King, but my knowledge of Whirlaway is limited. However, I have to say that this device is ideal for anyone who has a smaller septic system and doesn’t go through a lot of food. Most of the models on this list can be a bit too powerful and create too much waste for some households, so if you have limited space options (both in your sink and your septic tank), then this could be your best choice.

The 191 has the smallest motor on this list, but it has a lot of torque so you get a similar level of grinding power that you would with a larger unit. ⅓ horsepower doesn’t sound like much, but it processes waste remarkably well. The

size of this disposal is another bonus, provided that you don’t have a lot of room under your sink.

Other features include stainless steel impellers, a quick mounting system, and a two-year limited warranty from Whirlaway. Overall, this disposal is ideal for anyone on a budget or any household that doesn’t process a lot of food waste in the kitchen.


  • ⅓ horsepower motor
  • Creates powerful vortex
  • Quick mounting system
  • Stainless steel components
  • Magnet motor produces more power
  • Two-year limited warranty


  • Can be loud
  • Not as powerful as other similar models
  • May not be ideal for all septic systems
  • No power cord included

Waste King L-3200 Garbage Disposal

Next, we have the L-3200 from Waste King. This is on the more powerful side of disposals, meaning that if you want to process food faster and more efficiently then this is the way to go. While the size can be a bit large, you get a much more robust motor that will blast through almost any waste particles and should keep your septic tank free from overfill.

With a ¾ horsepower motor operating at 2700 rpm, you get a lot of bang for your buck. What I like about this model is that it is insulated to reduce noise, and all of the internal components are made of stainless steel. The splash guard on this device is removable for easier cleaning, and

installation is a breeze. As with all Waste King disposals, the L-3200 comes with an E-Z mounting system and a 36- inch power cord. Finally, you get an incredible eight-year warranty with this unit, making it one of the better options you can find.


  • ¾ horsepower motor
  • Operates at 2700 rpm
  • Insulated to reduce noise
  • Corrosion and rust proof
  • Stainless steel components
  • 36-inch power cord included
  • Removable splash guard
  • E-Z mounting system
  • Compatible with dishwashers and septic systems
  • Eight-year limited warranty


  • Can be loud even with insulation
  • May not fit under your sink due to size constraints

Waste King A1SPC Knight Garbage Disposal

Our final stop is the A1SPC Knight from Waste King. Looking at this disposal, you can see that it is much more powerful and efficient than the others we’ve seen thus far. The appearance of this machine lets you know that you’re getting a great deal even before you look at the laundry list of features.

First of all, you get a one-horsepower motor that operates at 2700 rpm. While the speed may not be faster than some other models we’ve seen, the level of torque is incredible, meaning that you get more processing power per pound. In this case, you don’t need multi-stage grinding as it will chew up food without any issues.

The mounting system is another aspect of the A1SPC that makes it a great buy. If you have another Waste King unit installed, this will be compatible with the E-Z mounting bracket. However, if you don’t have that, then the Knight comes with a snap-lock mount, which makes things even easier to install.

Finally, the best part of the A1SPC Knight is that it comes with proprietary Silencer technology, making this one of the quietest models you can find.


  • One-horsepower motor
  • Operates at 2700 rpm
  • High torque motor powers through food
  • Snap-lock mounting system
  • Proprietary silencer technology
  • Stainless steel components
  • 36-inch power cord included
  • Corrosion proof materials
  • Limited lifetime warranty


  • Larger than other similar models
  • Not ideal for all septic systems
  • Drainage may be slower than other models

Why Do You Need a Garbage Disposal for a Septic Tank?

If you ask around, you will get differing (usually conflicting) opinions on whether or not your septic system will benefit from having a disposal. On the one hand, it makes your kitchen operate much more efficiently without adding too much wastewater, but on the other hand, it could overload your system if you use it too much.

In my experience, however, most disposals don’t generate enough waste to make them a burden on your septic tank unless you have a smaller system than normal. However, assuming that your tank is large enough to handle a dishwasher or a washing machine, then you have nothing to worry about, especially if you get a disposal that helps treat your septic system.

Final Verdict​

For my money, the best option you can find will be the InSinkErator Evolution. Because this unit has a bio-pack to help you treat your septic tank, you are making your whole waste system much more efficient. My second choice would be the A1SPC Knight from Waste King as it can handle food much better than most of the other units. These disposals may cost more up front, but you will get better results, and they will last longer than anything else.​


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