BPI vs BNQ: Which Compostable Certification Do Canadian Retail Buyers Actually Require?

When a Canadian grocery or retail buyer asks for "compostable certification," they rarely mean one specific thing — and that ambiguity is exactly where procurement risk hides. For compostable bags and packaging in Canada, two names come up more than any others: BPI and BNQ. They are not interchangeable, and approving a supplier on the wrong one can leave a documentation gap that surfaces during an audit. This guide breaks down what each certification proves, which one your buyer is likely asking for, and what to verify before you sign off.

What BPI certifies — and where it comes from

BPI stands for the Biodegradable Products Institute, and its mark is the most widely recognized compostable certification across North America. A BPI certification is built on two ASTM standards:   ASTM D6400   for compostable plastics and   ASTM D6868   for compostable coatings applied to paper and fiber. Certification is laboratory-based — products are tested for disintegration, biodegradation, and plant/ecotoxicity under industrial composting conditions before the mark is granted.

For most national retail buyers in Canada and the US, BPI is the certification they name by default. If a procurement manager asks "is it BPI certified?", they are usually using BPI as shorthand for "has this been independently tested to a recognized compostability standard."

What BNQ certifies — and why it's the Canadian one

BNQ stands for the Bureau de normalisation du Québec, a Canadian standards body whose compostability programs are accredited by the Standards Council of Canada. As of July 2024, BNQ runs two certification programs based on the international standards   ISO 17088   (compostable plastics) and   ISO 18606   (packaging and organic recycling). These programs replaced BNQ's older CAN/BNQ 0017-088 program.

Like BPI, BNQ certification depends on independent laboratory testing — covering disintegration during composting, aerobic biodegradation, effects on plant growth, regulated metals and other toxic substances, and volatile solids. The resulting mark is recognized across Canada and carries particular weight for the Québec market and for buyers aligned with Canadian standards.

BPI vs BNQ — the practical difference for procurement

The key takeaway: BPI and BNQ are complementary, not competing . They rest on different standards families (ASTM vs ISO) and answer to different markets. Suppliers serious about Canadian retail often hold both, so they can satisfy whichever certification a given buyer names without re-testing.

Which one does your retail buyer require?

It depends on who is buying:

-National grocery and big-box chains— buyers typically ask about BPI first. Lead with BPI documentation.
-Québec market and RECYC-QUÉBEC-aligned buyers— the BNQ mark is the one that resonates, and bilingual programs expect a Canadian-recognized certification.
-ESG and compliance teams— increasingly want the certification plus separate PFAS-free documentation. (See our guide on [PFAS-free packaging and what procurement must verify](/blogs/news/pfas-free-packaging-canada-procurement).)

In practice, the compostability standards Canadian buyers recognize are a short list: ASTM D6400/D6868 (behind BPI), ISO 17088/18606 (behind BNQ), and the European EN 13432. If a "certification" doesn't map to one of these, treat it as a marketing claim, not a credential.

Why "certified" alone isn't enough — and what to verify

A logo on a slide is not a certification. Since June 2024, Canada's Competition Act (amended by Bill C-59) requires environmental claims to be backed by adequate and proper testing — and it puts the burden of proof on the party making the claim. As of June 20, 2025, private parties can bring greenwashing actions directly to the Competition Tribunal. In that environment, a "compostable" claim without a current, in-scope certificate is a documented liability — for the supplier and the retailer carrying the product.

Before approving any compostable supplier, verify five things:

1. Certificate number — does a real, current certificate exist?
2. Scope — does it cover the exact product or SKU you're buying, not a different item from the same factory?
3. Issuing body — BPI, BNQ, or another accredited body — and is it genuinely third-party?
4. Status and expiry — is the certificate active today?
5. The underlying test report — can the supplier produce the lab report behind the mark?

The bottom line

For Canadian retail, the safest position isn't choosing BPI or BNQ — it's holding documentation that satisfies whichever standard your buyer names, and ideally both. A supplier who can hand you the certificate number, the scope, and the test report on request is a supplier who will not become your audit problem.

See how Guarden's certification and compliance documentation is structured for retail procurement audits → [Certifications & Compliance](/pages/about-us)   

Building a vendor file? Request our compliance pack — BPI, BNQ, and PFAS-free documentation in one place — before your next vendor review.

- Bureau de normalisation du Québec — Compostable products certification (ISO 17088 / ISO 18606): https://bnq.qc.ca/en/certification/environment/compostable-products.html
- Government of Québec — BNQ new certification programs (July 2024): https://www.quebec.ca/en/news/actualites/detail/the-bnq-announces-the-implementation-of-two-new-certification-programs-for-compostable-products-57213
- Miller Thomson — Competition Bureau anti-greenwashing guidelines (Bill C-59): https://www.millerthomson.com/en/insights/esg-and-carbon-finance/canadas-competition-bureau-v-greenwashing-how-the-bureaus-new-guidelines-tackle-greenwashing-and-how-businesses-should-respond/
- BLG — Bill C-59 greenwashing & reverse onus / private right of action: https://www.blg.com/en/insights/2024/07/false-advertising-and-greenwashing-bill-c-59-changes-to-competition-act