The technical answer is about 95% to 99%. Almost everything in the food waste stream — peels, cores, bones, shells, grease, spoiled produce, expired dairy, plate scrapings, coffee grounds, tea bags, eggshells, meat scraps, even moldy bread and slimy lettuce — is compostable in a properly managed system. The remaining 1-5% is mostly contamination: stickers on produce, plastic packaging caught in food, twist ties, rubber bands, the small inedible bits of synthetic material that wind up in a kitchen waste stream.
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That’s the theoretical ceiling. The practical answer is dramatically lower, and the gap between technical and practical is where most of the interesting conversation about food waste lives.
Depending on what you’re measuring and where, the real-world percentage of food waste actually composted in the United States runs somewhere between 5% and 50%. The national average for residential food waste recovery is around 5-7%, according to EPA’s most recent estimates from 2019 (the latest year with comprehensive data). Cities with strong programs and dense composting infrastructure — San Francisco, Seattle, Portland — push that local rate up to 30-50% of household food waste. Cities without curbside composting are usually at 1-2%, because the only people composting are the backyard pile keepers and a small number of voluntary drop-off participants.
This article breaks down the numbers, the reasons for the gap, and what realistic targets look like for different communities.
What “food waste” actually includes
Before getting into percentages, it helps to be clear about what’s being measured. “Food waste” is a broad category that the EPA and most international tracking bodies divide into a few distinct buckets:
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Food loss in agriculture and processing. Produce that doesn’t get harvested because it’s not pretty enough. Milk dumped because of supply gluts. Slaughterhouse byproducts. This is roughly 20-30% of total food waste by tonnage.
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Manufacturing and distribution waste. Damaged inventory, expired stock, returns. Roughly 10-15% of total.
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Retail and food service waste. Restaurant kitchen scraps, expired grocery store products, hotel buffet leftovers, hospital tray returns. Roughly 25-35% of total.
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Consumer/household waste. What goes in the home trash can or compost bin. Roughly 30-40% of total.
For composting math, what matters is what’s actually accessible to composting infrastructure. Agricultural waste is often handled on-site (left to decompose in fields, fed to animals, used for biogas). Manufacturing waste sometimes goes to industrial composters or anaerobic digesters. Retail and food service waste is the biggest target for institutional composting programs. Household waste is the target for residential curbside composting.
The composting infrastructure question is mostly: which of these streams can we capture, and at what cost?
What’s compostable in principle
Almost everything in a kitchen is biological material that breaks down into soil. The list is essentially: anything that was once alive, plus the byproducts of cooking.
Plant material: fruit peels, vegetable scraps, herb stems, tea leaves, coffee grounds, cores, stems, lettuce leaves, onion skins, garlic skins, watermelon rinds, corn cobs and husks, pineapple tops, banana peels. Everything plant-based composts, and most of it composts fast (weeks to months).
Animal products with proper management: meat scraps, bones, fish, shellfish shells, dairy, eggs, eggshells. These compost fine in hot pile or commercial systems, slower or with smell issues in cold backyard piles, but they’re not impossible at home with the right setup. Major commercial composters accept all of this routinely.
Cooked food and grease: leftover pasta, cooked vegetables, sauces, soups, rice, beans, bread, pastries, pizza crusts, even moldy and slimy leftovers. All compostable. Grease can be in small amounts; larger quantities (a frying pan of bacon grease) should be drained into a separate fat container rather than dumped into compost.
Paper-fiber products: paper towels, napkins, paper plates (uncoated), kraft paper bags, parchment paper. These count as “browns” in compost and balance out the high-moisture food scraps. Many commercial programs accept these alongside food.
Pet-related compost-safe items: dog hair (slow), nail clippings, used parakeet paper liner. Pet manures (cat litter, dog poop) are a separate conversation — generally not for food gardens but okay for ornamental composting if hot enough.
What’s NOT compostable: plastic stickers on produce, twist ties, rubber bands, foil-lined packaging, glass shards, ceramic chips, plastic-coated paper, polystyrene foam. These are the contamination that limits composting yield.
In aggregate, about 95-99% of typical kitchen and food service waste by weight is genuinely compostable. The other 1-5% is contamination that needs sorting out.
What’s actually composted in the US
EPA estimates from 2019 (the most recent comprehensive year, summarized in their Facts and Figures about Materials, Waste, and Recycling report):
- Total food waste generated in the US: approximately 66 million tons per year (households, retail, food service combined)
- Total food waste sent to landfill: approximately 36-40 million tons
- Total food waste composted or otherwise recovered: approximately 4-5 million tons (mostly large-scale agricultural and processor waste streams, plus a smaller residential portion)
- Total food waste sent to anaerobic digestion or biogas: approximately 2-3 million tons
- Total food waste combusted (incineration): approximately 7-9 million tons
So the headline national number for “food waste actually composted” is roughly 6-8% of total food waste generated. That number includes large-scale agricultural compost streams; the residential and consumer portion is closer to 3-5%.
State-level numbers vary wildly:
- California: SB 1383 mandate requires diversion of food waste statewide; current diversion is roughly 20-30% and rising as the program builds out. Goal is 75% by 2025.
- Vermont: All food waste banned from landfill since 2020. Diversion is around 25-40% depending on jurisdiction.
- Massachusetts: Commercial food waste over 1 ton/week banned from landfill since 2014; expanded to half-ton/week in 2022. Diversion is roughly 15-25%.
- New York City: Curbside composting program rolling out 2023-2024; current participation rates are 10-20% in served areas, growing.
- Seattle: Curbside composting since 2009. Diversion rate is roughly 40-50% of household food waste.
- San Francisco: Curbside composting since 1996. Diversion rate is roughly 50-60% of household food waste, the national leader.
So in the strongest cities and states, food waste composting hits 40-60%. In most of the country, it’s under 5%.
Why the gap exists
The gap between what’s technically compostable (95%) and what’s actually composted (under 10% nationally) is structural, not material. The reasons:
Lack of curbside collection. About 90% of US households don’t have access to curbside compost pickup. Without a green bin at the curb, food waste defaults to trash. Composting requires either home composting infrastructure or drop-off effort, which most people don’t do.
Lack of commercial composting facilities. Even where curbside pickup exists, the food waste has to go somewhere. Commercial composting facilities are concentrated in the West Coast, the Mountain West, and parts of the Northeast. Vast swaths of the South, the Midwest, and the Great Plains have minimal or no commercial composting capacity. A city without a regional composter can’t run curbside composting cost-effectively.
Contamination problems. Even where collection exists, contamination from plastic bags, plastic stickers, packaging, and other non-compostable materials degrades the value of finished compost. Programs spend significant resources on outreach, education, and sorting.
Backyard composting limits. Home composting works for produce scraps and some yard waste but doesn’t handle meat, dairy, or bones well in most setups. Cold home piles don’t reach the temperatures needed for safe meat composting. So even households actively composting often divert only 30-50% of their food waste — vegetable scraps go to compost, meat and dairy still go to trash.
Behavioral friction. Even with access to curbside composting, participation rates rarely exceed 50-60% of eligible households. Some people don’t sort. Some fill the bin so infrequently it gets fly-infested between pickups. Some forget. Behavioral economics are a significant constraint.
Cost structure. Commercial composting is more expensive than landfilling in most US markets (tipping fees of $40-80/ton versus $30-60/ton). Without policy mandates or pricing reform, the financial logic favors landfill. California’s SB 1383 and Vermont’s universal recycling law are explicit policy interventions to shift the math.
What the realistic ceiling looks like
So what’s the achievable percentage of food waste composted, accounting for real-world constraints? A few thoughtful estimates:
With perfect commercial infrastructure and 100% household participation: roughly 70-85% of total food waste could be composted. The remaining 15-30% would be contamination losses, unrecoverable agricultural waste, and process inefficiencies.
With realistic infrastructure rollout over 10-15 years and 60-70% participation: roughly 40-50% of total food waste could be composted. This is roughly the level San Francisco achieves now, with mature infrastructure and high participation.
With current infrastructure plus modest expansion: roughly 15-25% of total food waste could be composted within 5 years if every state implemented California-style programs. This is the policy-feasible target — ambitious but not utopian.
The EPA’s own Wasted Food Scale (their hierarchy of food waste solutions) puts composting below source reduction, donation, and animal feed but above landfill. The agency’s targets emphasize source reduction (preventing waste in the first place) and recovery (donation to food banks) before composting. The realistic composting target is to handle the unavoidable food waste — peels, spoiled produce, plate scrapings — that can’t be prevented or eaten.
What you, individually, can do
Setting aside national infrastructure, what fraction of your own food waste can you compost?
If you have curbside compost pickup: 80-95% is achievable. Use the green bin for everything food, including meat and dairy and bones. Use kraft paper or compostable bags as liners. Only the contamination items (stickers, twist ties, foil-lined packaging) go to trash.
If you have backyard compost and no curbside pickup: 50-70% is achievable. Vegetable and fruit scraps, coffee grounds, eggshells, tea bags, paper towels go to the pile. Meat, dairy, fish, and bones go to trash because they don’t compost safely in most backyard piles. If you have a hot pile (60°C+) you can compost more, but that’s an advanced setup.
If you have neither curbside pickup nor backyard space: 0-20% is achievable through drop-off programs, worm bins, or community garden composting. Worm bins handle vegetable scraps but not meat or dairy. Drop-off programs (often at farmers markets) accept most things but require regular trips. Community gardens vary.
If you have nothing: the realistic answer is that almost none of your food waste gets composted. You can still reduce waste by buying smaller quantities, freezing leftovers, planning meals, and donating excess. But composting requires infrastructure access.
Where institutional and commercial waste comes in
For most readers of B2B sustainability content, the more interesting question isn’t household composting but institutional composting. A restaurant, hospital cafeteria, university dining hall, corporate cafeteria, hotel, or event venue generates 50-500 pounds of food waste per day. That’s where the leverage is.
Institutional food waste programs typically achieve 60-85% diversion when they have:
– Reliable hauling partnership with a commercial composter
– Back-of-house bin setup separating compost, recycling, trash, and grease
– Staff training on proper sorting
– Periodic audits to identify contamination sources
The math at scale is significant. A 500-bed hospital diverting 70% of its food waste eliminates 50-100 tons of landfill waste per year. A university dining hall with 5,000 daily meals can divert 200-400 tons per year. These are the leverage points for organizational sustainability programs.
For B2B operators sourcing compostable supplies that integrate with institutional food waste programs, our compostable food containers, compostable bowls, and compostable utensils lines are designed for high-volume institutional use, with BPI certification ensuring the items go through commercial composters rather than contaminating compost streams.
The summary answer
So what’s the percentage?
- Technically compostable by material: 95-99% of food waste
- Actually composted nationally in the US right now: approximately 6-8% of food waste
- Actually composted in the strongest US cities: approximately 40-60% of household food waste
- Realistic national ceiling with current technology and behavior: approximately 70-85%
- Realistic 5-year target with policy expansion: approximately 15-25%
- What you personally can achieve with curbside pickup: 80-95%
- What you personally can achieve with backyard composting alone: 50-70%
The biggest variable isn’t material — almost all food waste is compostable. The biggest variable is whether the infrastructure exists to handle it. Where infrastructure exists, participation rates determine the actual diversion. Where infrastructure doesn’t exist, the gap between “compostable in principle” and “composted in fact” is essentially 100%.
The headline of any food waste composting conversation should be: the material isn’t the problem. The system is. Expanding curbside composting access in the next decade is the single highest-leverage action that would move the national percentage from under 10% toward the 30-50% range that some US cities have already demonstrated is achievable.
For B2B sourcing, see our compostable paper hot cups & lids or compostable cup sleeves & stir sticks catalog.
Verifying claims at the SKU level: ask suppliers for a current Biodegradable Products Institute (BPI) certificate or an OK Compost mark from TÜV Austria, and check that retail-facing copy meets the FTC Green Guides qualifier requirement on environmental claims.