Are Compostable Packaging Claims Legit? What Certifications Mean
Compostable vs biodegradable packaging explained. Learn what certified compostable really means, which certifications matter, and how to spot greenwashing.
You've seen the claims on coffee cups, food containers, and shopping bags: "compostable," "biodegradable," "eco-friendly." If you're a brand evaluating whether compostable packaging is the right call, or trying to figure out whether a supplier's claim is real, you're asking exactly the right question. The certifications are legitimate and the standards are rigorous. The gap is between what a certification guarantees and what actually happens when your customer throws the package away. Here is what you need to know before putting anything on your label.
What "Compostable" Actually Means (and What It Doesn't)
Compostable packaging is designed to break down into organic matter under specific composting conditions, leaving no toxic residue behind. That sounds simple enough, but the phrase "specific conditions" is doing a lot of work in that sentence.
When something is certified compostable, it means the material has been tested to confirm it will disintegrate and biodegrade within a certain timeframe when exposed to the heat, moisture, and microbial activity found in composting systems. The key standards are ASTM D6400 for plastics and D6868 for coated papers in North America, and EN 13432 in Europe. These standards require at least 90% of the material to break down into carbon dioxide within roughly 180 days under industrial composting conditions.
Here is what certified compostable does not mean: it is not a license to litter. It does not mean you can toss a cup out your car window and it will harmlessly disappear. It does not mean the package will break down in your backyard, in the ocean, or in a landfill. Compostable packaging only works when it actually gets to a composting facility designed to process it.
Why "Biodegradable" Is Usually a Red Flag
If compostable is specific and verifiable, biodegradable is vague and often misleading. The two terms are not interchangeable, and mixing them up is one of the fastest ways to spot greenwashing in packaging.
"Biodegradable" just means something will eventually break down through biological processes. But eventually when, and under what conditions? A plastic bag might technically biodegrade in 500 years under perfect laboratory conditions. That claim is useless in the real world.
The FTC's Green Guides are direct about this: unqualified "biodegradable" claims are considered deceptive if the product will not completely decompose within one year after customary disposal. And since most packaging ends up in landfills, where conditions are deliberately engineered to be dry and oxygen-poor to prevent decomposition, the EPA notes that even legitimately biodegradable materials do not break down the way most people assume.
If a package says "biodegradable" without specifying certified compostable standards, treat it with skepticism. It is typically a marketing term, not a meaningful environmental claim. As we cover in our post on greenwashing explained, vague environmental language without third-party verification is one of the most common patterns worth watching for.
The Certifications That Actually Matter
So how do you tell if a compostable packaging claim is legitimate? Look for third-party certifications from organizations that have no financial stake in selling you the package.
BPI Certification (North America)
The Biodegradable Products Institute (BPI) is the most recognized compostable certification body in North America. BPI verifies that products meet ASTM D6400 or D6868 standards and prohibits intentionally added PFAS (per- and polyfluoroalkyl substances) with a total organic fluorine threshold of 100 parts per million or less.
When you see the BPI logo, it means the product has been independently tested and confirmed to break down in industrial composting facilities. It does not guarantee that your local composting program will accept it, but it does mean the material is capable of composting under the right conditions.
ASTM D6400 and D6868 Standards
These are the actual lab test methods that BPI and other certifiers use. ASTM D6400 applies to plastics, while D6868 covers fiber-based products with coatings or laminates (like compostable paper cups with a bio-based liner). Both require disintegration through a 2 mm sieve within about 84 days and at least 90% biodegradation to CO2 within roughly 180 days, plus limits on heavy metals and ecotoxicity.
ASTM has also introduced in-field testing standards (D8618 and D8619) that measure how products actually perform at real composting facilities, not just in a lab. This is a meaningful step forward, because some items that pass lab tests still struggle to break down in real-world composting operations that run shorter cycles or different temperatures.
EN 13432 and TÜV Austria (Europe)
In Europe, EN 13432 sets similar criteria to ASTM D6400 for industrial composting. TÜV Austria issues "OK compost INDUSTRIAL" marks for products that meet this standard, and a separate OK compost HOME certification for materials proven to break down in lower-temperature backyard composting. For North American brands, ASTM and BPI are the recognized benchmarks. For European markets, EN 13432 certification is often required by regulation.
Industrial vs. Home Compostable: A Critical Distinction
Not all compostable packaging is created equal. The vast majority of certified compostable products are designed for industrial composting, which operates at much higher temperatures (typically 130 to 160°F) than a backyard compost pile.
Industrial composting facilities use controlled conditions, regular turning, and precise moisture and oxygen levels to speed decomposition. Home composting is cooler, slower, and more variable. A package certified as industrially compostable may sit intact in your backyard bin for months or years without breaking down.
Home compostable certification (such as TÜV Austria's OK compost HOME) is much rarer and requires testing at lower temperatures that mimic backyard conditions. If a package is only certified to ASTM D6400 or EN 13432, it is not designed for home composting. Always check which standard the certification references. Our post on are compostable coffee pods actually compostable covers this industrial vs home distinction in detail for one of the most common compostable formats on the market.
The Infrastructure Reality
Here is the hard truth: certified compostable packaging only delivers environmental value if it actually gets composted. And access to composting infrastructure in the U.S. is inconsistent at best.
According to a nationwide BioCycle survey, only about 18% of the sampled U.S. population has access to programs that accept some types of compostable packaging. Among full-scale food waste composting facilities, 62% reported accepting certified compostable packaging in recent surveys, up from 48% a few years earlier. That is progress, but it also means nearly four in ten facilities still do not accept it.
Why the hesitation? Composters worry about contamination from look-alike conventional plastics, processing time (some certified items take longer to break down than food waste), and consumer confusion. Even when a package is technically compostable, if it looks like regular plastic it may get screened out as contamination or mistakenly tossed in the recycling bin where it causes problems.
Before you commit to compostable packaging, talk to the haulers and composting facilities in your target markets. Certification proves the material can compost. Acceptance by local programs determines whether it actually will.
What About PFAS and Chemical Safety?
One reason to prioritize legitimate third-party certification is chemical safety. For years, some compostable and conventional food packaging contained PFAS, synthetic chemicals used for grease and moisture resistance that do not break down in the environment and have been linked to health concerns.
BPI certification now prohibits intentionally added PFAS and requires total organic fluorine below 100 ppm. California has banned PFAS in plant-fiber food packaging statewide, and other states are following. A growing number of states have active restrictions on the books. Our post on PFAS food packaging bans by state covers which states have passed laws and what compliance requires.
This is another place where vague "biodegradable" or "eco-friendly" claims fall short. A package can technically biodegrade and still leave harmful residues behind. Certified compostable standards include ecotoxicity testing to ensure the finished compost is safe.
How to Tell If a Compostable Claim Is Real: Your Checklist
When evaluating a compostable packaging claim, run through these five checks:
Look for a recognized third-party certification mark. BPI, TÜV Austria OK compost, or equivalent. If the package just says "compostable" with no certification logo, it is not verified.
Check which standard it meets. ASTM D6400/D6868 and EN 13432 are for industrial composting. If it does not specify, assume industrial and confirm local facilities accept it.
Confirm PFAS-free status. Ask suppliers directly or look for certifications that include chemical restrictions.
Verify local acceptance before you launch. A certified product that no one in your market can compost delivers no environmental benefit and may confuse customers.
Avoid unqualified "biodegradable" claims. Per the FTC Green Guides, these are often misleading and offer no meaningful environmental standard. If a supplier cannot point to independent lab results or a third-party certification, that is a red flag.
What This Means for Your Brand
Compostable packaging is not magic, and it is not a perfect solution to waste. But it is real progress when used in the right context.
If you are a brand considering compostable packaging, start with honest questions. Do your customers have access to composting programs that accept the format you are considering? Are you prepared to educate them on proper disposal? Does the certification meet the standards your state or country requires?
The best use case for compostable packaging today is in settings where the composting pathway is confirmed: foodservice venues with organics collection, campus programs, cities with robust curbside composting, or closed-loop programs where you control collection. In those contexts, certified compostable packaging can deliver exactly what it promises. In general retail with no verified composting infrastructure for your customers, the material often ends up in the landfill, and the claim on the label becomes more of a liability than an asset.
When compostable packaging does make sense for your product and market, choose suppliers who can show you third-party certifications, share test data, and confirm acceptance with local composting facilities. That transparency is the difference between a defensible sustainability claim and greenwashing. Our compostable packaging page covers the supplier landscape across formats, with certifications and the questions worth asking before you commit. Specific category pages cover where compostable options are most likely to perform well in practice:
Sustainable packaging can be complicated, but we are here to change that. If you already know what you need, our free search tool gets you there fast. If you want to explore what's out there, our sustainable packaging suppliers directory covers companies across every format and category. And if you'd rather have us help you find the right fit, get in touch and we'll point you in the right direction.
Packaged Sustainable Team
