are coffee filters compostable

Are Coffee Filters Compostable? Are you a chronic coffee drinker? Do coffee filters laced with grounds pile up in your trash day after day?

Do you sigh when you see the waste and wonder what, if anything, can be done to reduce environmental impact?

Since it’s not advisable to re-use the filters for a second batch of brew, what are your alternatives? If you’re wondering are coffee filters compostable, the answer is a resounding yes!

Here’s an all-encompassing guide that will teach you how to compost coffee filters. But first, the million-dollar question! 

Are Coffee Filters Biodegradable?

 are coffee filters biodegradable

If you’re unfamiliar with the term biodegradable or know what it is but aren’t sure how it applies to paper, then here’s a little need-to-know.

Biodegradable implies that a product will break down naturally over time. No special conditions are required. However, depending on the product, it may leave an inorganic or metal residue.

Since most coffee filters are made from paper, they are biodegradable. You have to figure out what kind of paper was used for the filter and whether any chemicals went into the manufacturing process.

Regardless of whether you toss them straight into your soil or bury them under the ground, they will disintegrate with time.

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In terms of its chemical composition, filter paper is mostly made from cellulose, like leaves and wood.

This means that large organisms such as worms or termites and microorganisms will happily feast on coffee filters, digest them and return the waste to the soil.

And since the paper is mostly made from organic compounds such as carbon, hydrogen, oxygen, and nitrogen, its breakdown fertilizes the soil.

Paper is one of the most biodegradable materials made by humankind.

Are Coffee Filters Compostable?

Compostable is pretty much interchangeable with biodegradable, except for one tiny difference—the time factor.

When composting, you add waste to a moist pile that includes dirt, mixed organic items, worms, critters, etc., at an ideal temperature in specific layers to speed up the decomposition rate.

While a paper-based filter might take months to break down naturally, it can become plant food in about two weeks in a compost pile.

Adding food waste such as banana peels, breadcrumbs, and fruit bits will provide the perfect breeding ground for critters and microorganisms and help expedite the process.

If your coffee filters are 100% organic (which they should be,) then yes, toss them in your compost pile.

This will significantly reduce the waste you produce at the end of each day.

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Some coffee filters, however, are treated with bleach and other chemicals. Fortunately, you’ll only ever find minute traces of these chemicals.

For strictly organic compost, it’s best not to add chemically-treated filters. Not that you’ll have much of a problem if you already used them; it’s just a precaution to minimize the toxins in your soil.

Brown compostable coffee filters are the best choice for a compost pile. They’re slightly more expensive, but you’ll get your money’s worth out of them when your garden flourishes.

Do Coffee Filters Contain Any Plastic?

Unless they’re plastic filters, it isn’t very likely. But it’s always useful to be skeptical of large-scale manufacturers since we don’t know what goes on during the bleaching process.

The packaging might give you a clue about what possibly ended up in your filters, but it’s best to be safe and stick with reusable filters or brown ones.

Can Coffee Filters be Composted with Coffee Grounds?

Coffee enriches your soil by encouraging the growth of microorganisms. It is thus widely considered to be a good ingredient for composting.

However, there are concerns regarding how this might affect the soil’s pH levels. Coffee is acidic by nature, but the acidic component dissolves in our beverage when we boil it.

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This leaves very little in the used grounds.

A pH range between 6 (mildly acidic) to 7 (neutral) is ideal for most soils. Used coffee grounds might have a pH in the area of 6.5 to 6.8, so they’ll blend into your compost quite well.

Just a heads up, though. Decomposing coffee grounds are likely to emit a foul stench.

If you’ve ever left used coffee grounds in the bin for too long, you might be familiar with the punch-packing aroma. That’s why they’re better off in the compost pile outside your house.

Watch this video for some professional tips to keep in mind when composting coffee grounds.

Are Coffee Grounds Suitable for Grass?

As long as it’s a thin spread, coffee can help your grass grow faster as it expedites the development of a range of nutrients in the soil.

Again, since there’s an acidic element present in coffee, it works best when paired with hydrated white lime.

How Can You Compost Coffee Filters Yourself – DIY Guide

how to compost coffee filter

The U.S. Environmental Protection Agency noted that thirty-one percent of the waste found in landfills in 2008 was paper products.

This is a waste of nutrient-rich soil fodder that can help your garden or lawn plants grow healthier.

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If you drink coffee regularly, keep a compost bin or bucket in hand to store your used filters.

You can conveniently dump these onto your compost pile on a weekly basis. As soon as you have enough, follow these steps.

Step 1. Prepare Your Coffee Filters for Composting

Remove your coffee filters and shred them to increase their surface area and spread. The most compostable coffee filters are plastic-free and brown.

You don’t have to remove the coffee from your filters since these are going to be added to the pile anyway.

But if you like to keep your compost bins stench-free and want the coffee beans to disintegrate sooner, you can just spread them out onto the soil and mix it up to help it dry out faster.

Step 2. Collect a Range of Organic Materials to Add

To bust a prevalent gardener’s myth, coffee grounds are not nitrogen fertilizers. They will not enrich your soil with nitrogen.

However, they do encourage rapid growth and reproduction of microorganisms that help with the breakdown process.

This means you will have to incorporate some additional organic waste material into your coffee filter compost to provide your soil with essential minerals.

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You could add some examples of nitrogen-rich materials: manure, lawn clippings, banana peels, and any excess waste from vegetables.

The microorganisms will break down the nutrients to supply abundant amounts of nitrogen to the soil.

Step 3. Layer Your Compost Pile

First off, remember not to add too many coffee filters in one go. The best compost mix consists of a healthy balance of nutrients from different materials.

It’s the same concept as ‘too much sugar spoils the dish.’

For efficient decomposition, your compost heap should be at least three feet deep and spread across a wide area. This helps maintain the temperatures needed for the process.

Your first layer should consist of your carbon-rich waste materials (which is where the shredded coffee filters come in) on the soil.

For the second layer, add an equal amount of nitrogen-rich food waste. Finish this with a topping of at least two inches of soil, and your compost pile is ready.

Step 4. Keep Your Pile Moist

You might notice that your coffee filter compost will start to lose humidity over time. This is because coffee grounds tend to dry up easily.

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The ideal level of humidity for your soil is the same as a partially dried sponge. You can use that as a yardstick to monitor your soil’s humidity and mist it down with a hose whenever needed.

However, if it’s too wet, just add more soil or compost to absorb the excess moisture.

Step 5. Mix Your Compost Heap Regularly

Every time you add water, rotate the heap to spread the moisture out as evenly as possible. Your coffee filters and grounds need to be moist to break down. Otherwise, they will take longer than usual.

You can do this with a shovel or a rake but make sure you mix the pile at least once every two weeks. 

Another great way to encourage breakdown is by introducing a worm culture.

Earthworms create burrows, which help to mix organic material with the soil and improve water infiltration through its channels.

What Happens if You Add Too Many Coffee Grounds?

adding coffee grounds

Waste organic material tends to fall into two categories, ‘green‘ and ‘brown‘. Coffee filters are categorized in the latter because they’re made from paper, which is carbon.

Coffee itself, however, is considered green since it is rich in proteins.

Both greens and browns can be overdone. Since coffee grounds are mildly acidic, adding too much can create a problem for your compost.

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This is because your goal is to break the materials down, but acid tends to act as a preservative.

A pro-tip for balancing this out in case you’ve added too much coffee to your soil, add freshly squeezed white lime.

As organic matter decomposes, it tends to get more acidic anyway, and the excess coffee grounds don’t help. But juice from the lime can neutralize the acids while the compost is still breaking down.

This not only creates the best conditions for your soil but helps make the most out of your excess coffee grounds. Remember to keep adding organic material to keep your compost balanced.

Can coffee filters be composted with coffee grounds? Check. And now you know ‘how to.’


Here is a quick recap on all the important points on are coffee filters compostable:

  • If they are made from paper, they are 100% biodegradable and compostable.
  • Coffee grounds can be composted with the filters, but remember, moderation is key.
  • Monitor your compost pile’s moisture levels and shuffle it now, and then help speed things along.

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