California’s Department of Cannabis Control (DCC) announced expanded mandatory Aspergillus testing requirements that will take effect across the licensed cannabis market in 2027. The expansion builds on California’s existing four-species Aspergillus testing mandate and adds new requirements around testing methodology, sample collection protocols, and documentation standards that labs must meet to issue valid compliance results.
What Is Changing
The 2027 requirements will make California’s Aspergillus testing framework one of the most rigorous in the country. Key changes include standardized sample preparation protocols that reduce variability between labs, minimum detection sensitivity thresholds that all licensed testing labs must demonstrate, and enhanced chain-of-custody documentation for Aspergillus samples.
The DCC also announced that it will expand its post-market surveillance testing program, increasing the frequency and geographic distribution of retail sampling for Aspergillus. Operators whose products fail surveillance testing after passing compliance testing will face enhanced regulatory scrutiny and potential suspension of testing relationships with the lab that issued the original passing result.
Why California Is Taking This Step
California’s 2025 recall record drove the DCC’s decision to expand Aspergillus requirements. The state saw a significant increase in Aspergillus-related recalls in 2025, with multiple high-profile brands affected. DCC analysis found that testing methodology inconsistency between labs was a contributing factor in some cases, with different labs producing materially different results for the same product lots.
What Cultivators Should Do Now
The 18-month window between the June 2026 announcement and the 2027 implementation is not as long as it sounds for operators who need to build quality assurance infrastructure from scratch. Cultivators in California should audit their current post-harvest processes for Aspergillus risk points, evaluate post-harvest decontamination options that can reduce baseline spore loads before compliance testing, and ensure their testing laboratory of choice is actively preparing for the expanded requirements.
Operators who wait until 2027 to begin adapting to the new requirements will face a compliance cliff. Those who start now will enter the new regulatory environment with seasoned protocols and tested decontamination systems already in place.
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