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Image of EPA's Food Recovery Hierarchy


Composting is the fifth tier of EPA’s Food Recovery Hierarchy. Even when all actions have been taken to use your wasted food, certain inedible parts will still remain and can be turned into compost to feed and nourish the soil. Like yard waste, food waste scraps can also be composted. Composting these wastes creates a product that can be used to help improve soils, grow the next generation of crops, and improve water quality.

What is Compost?

Gardeners and farmers add compost to soil to improve its physical properties. They may even use compost instead of soil to grow plants. Mature compost is a stable material with a content called humus that is dark brown or black and has a soil-like, earthy smell.

Compost is created by:

  • Combining organic wastes, such as wasted food, yard trimmings, and manures, in the right ratios into piles, rows, or vessels.
  • Adding bulking agents such as wood chips, as necessary to accelerate the breakdown of organic materials; and
  • Allowing the finished material to fully stabilize and mature through a curing process.

Mature compost is created using high temperatures to destroy pathogens and weed seeds that natural decomposition does not destroy.

Benefits of Composting

There are a number of benefits to compost that not everyone is aware of. Some examples are listed below:

  • Organic waste in landfills generates, methane, a potent greenhouse gas. By composting wasted food and other organics, methane emissions are significantly reduced.
  • Compost reduces and in some cases eliminates the need for chemical fertilizers.
  • Compost promotes higher yields of agricultural crops.
  • Compost can help aid reforestation, wetlands restoration, and habitat revitalization efforts by improving contaminated, compacted, and marginal soils.
  • Compost can be used to remediate soils contaminated by hazardous waste in a cost effective manner.
  • Compost can capture and destroy 99.6 percent of industrial volatile organic chemicals (VOCs) in contaminated air.
  • Compost can provide cost savings over conventional soil, water and air pollution remediation technologies, where applicable.


Getting Started

It is important to know the composting process before beginning composting or starting a composting program.


Composting Legal Basics for Businesses and Organizations

Landfill Bans on Organics

Some states have bans on landfill disposal of organic materials like wasted food. The U.S. Composting Council compiles information on state compost regulations EXIT.


Biosolids Composting and Use or Disposal of Sewage Sludge

The Clean Water Act covers land application, surface disposal, and combustion of biosolids sewage sludge as well as biosolids composting. EPA published federal standards for the use or disposal of sewage sludge, which can be found in title 40 of the Code of Federal Regulations (CFR) in part 503. Many of the standards in this rule may apply to municipal solid waste compost. More information can be found on EPA’s Biosolids website.

Success Stories

New Seasons Markets

New Seasons Markets operates 12 stores in the Pacific Northwest and strives to support the local economy and sustainable agriculture. Since 2006, New Seasons Market has increased diversion of organic materials, including food waste to compost by 109 percent. Since 2011, they have diverted more than 2,410 tons of food from landfills and saved more than $25,000 in waste expenses. Find out more in the case study about New Seasons Market’s food donation and composting initiatives.


Petco Park

Petco Park, home to the San Diego Padres, implemented a food composting program in 2005 helping the venue to save money on its trash disposal bills. In 2011, Petco Park diverted 164 tons from landfill, saving $75,000 since 2005.

read more EPA

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Date: 2017-02-22

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