THE QUICK ANSWER
Rarely, in practice. A bag can meet the standard for industrial composting, but pet waste is usually kept out of compost programs, and the Biodegradable Products Institute certifies pet waste bags for commercial composting in Canada only, because home bins do not get hot enough to kill pathogens. California bans “biodegradable” on product labels, and Washington on plastic products.
THE NUMBERS
- Canada only
- where BPI allows certified compostable pet waste bags to be distributed. BPI
- 100 ppm
- the maximum total organic fluorine for a product labeled “compostable” in California. Cal. Pub. Res. Code §42357
- 1 year
- the FTC’s test for “biodegradable”: items bound for landfill will not break down within it. FTC Green Guides
- $500–$2,000
- civil penalty per violation of California’s compostable labeling law, rising with repeat violations. Cal. Pub. Res. Code §42358
What “compostable” means on a bag
For plastics, “compostable” normally means the material meets ASTM D6400, a specification for plastics designed to compost in municipal or industrial facilities. It is not a home compost standard. The US Federal Trade Commission requires marketers to have competent and reliable scientific evidence that all the materials will break down into usable compost safely and in about the same time as the material they are composted with, and to qualify the claim when facilities are not available to a substantial majority of consumers.
Why pet waste rarely reaches a compost facility
Seattle Public Utilities answers the question directly: a compostable bag does not make pet waste compostable, and pet waste should always go in the trash whatever bag it is in. The Biodegradable Products Institute limits certified pet waste products to commercial composting in Canada, because backyard bins do not typically get hot enough to kill the pathogens in pet waste, and restricts those bags to distribution in Canada. A bag that ends up in landfill does not compost there.
What California allows on the label
California Public Resources Code §42357 prohibits selling a product labeled “biodegradable”, “degradable” or “decomposable”. A product may be labeled “compostable” only if it meets the applicable ASTM standard and every further condition: certification by an approved third party, total organic fluorine of no more than 100 parts per million, labeling that distinguishes it from non-compostable products on reasonable inspection, eligibility as an allowable organic input under the USDA National Organic Program, and a design associated with the recovery of food scraps and yard trimmings collected for composting. Whether a bag made for dog waste can meet that last condition is a question for California counsel. Penalties run from $500 for a first violation to $2,000 for a third and later ones.
“Biodegradable” is the weaker claim, not the safer one
The FTC treats an unqualified degradable claim as a promise that the whole item breaks down within a reasonably short time after customary disposal, which it sets at one year. Items destined for landfills, incinerators or recycling facilities will not degrade within a year, so unqualified biodegradable claims should not be made for them. Washington State goes further for plastics: no producer may sell a plastic product labeled “biodegradable”, “degradable”, “decomposable” or “oxo-degradable”, or imply it will break down in a landfill or other environment.
What a private-label waste bag can claim
Do not print “biodegradable”, “degradable”, “decomposable” or “oxo-degradable” on bags sold in California or Washington, or anything implying the bag breaks down in a landfill. Treat “compostable” on a US pet waste bag as a high legal risk that needs third-party certification, state labeling rules and a lawyer’s sign-off before shipment. Claims that do not depend on composting are easier to substantiate: a documented share of post-consumer recycled content, film thickness, tear and leak performance, and roll count. Avoid leaf imagery or colors that suggest a compostability the bag cannot deliver.
A useful comparison
| Claim | Where it stands | Specification response |
|---|---|---|
| “Biodegradable” | Banned on product labels in California and on plastic products in Washington; the FTC says landfilled items will not degrade within a year | Do not use |
| “Compostable” (US) | Only with the ASTM standard, certification and state label rules; pet waste is rarely composted | High risk: needs counsel’s sign-off |
| “Home compostable” | Home bins do not reliably kill pathogens in pet waste | Do not use for pet waste bags |
| Recycled content | Substantiated by a documented percentage | Preferred, with evidence on file |
Explore private-label product options.
No-pull dog harness — materials, customization and sample checks Standard dog leash — materials, customization and sample checks Adjustable webbing collar — materials, customization and sample checksSources and research context
Sources reviewed 2026-09-18. Community excerpts are anecdotes. Manufacturer guidance applies to that manufacturer’s products. Shortlists are editorial comparisons without hands-on comparative testing or verified sales rankings.
- U.S. Federal Trade Commission · Environmental Claims: Green Guides
- California Public Resources Code §42357 · Labeling of compostable and biodegradable products
- California Public Resources Code §42358 · Civil penalties
- Revised Code of Washington 70A.455.030 · Use of terms on label
- Biodegradable Products Institute · Frequently asked questions
- Seattle Public Utilities · What to do with pet waste
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