2021 — 2025 Year-over-Year Trends
213,641 total samples across 5 years of Massachusetts cannabis testing data
Data through: 11/30/2025
This site relies entirely on data published by the Cannabis Control Commission via their Open Data Catalog and is only current through the dates they make available.
Note: 2024 testing data was released by the CCC on 4/15/2026 and is now incorporated. All five years of trend data are real CCC values — no interpolation is used. Note that 2024 testing did not include pesticide screening (only metals, cannabinoids, and microbial), so failure-rate comparisons across years should be interpreted with that caveat.
Lab Name Caveat: There is no confirmation that the anonymized lab identifiers (LabA, LabB, etc.) in the 2021-2023 dataset correspond to the same labs (Lab_A, Lab_B, etc.) in the 2025 dataset. Year-over-year lab-level comparisons should not be assumed to track the same facilities.
Mean THCA Change
+5.6%
20.0% (2021) → 25.7% (2025)
Over 30% THCA
2.5% → 18.7%
2021 → 2025
YM Fail Rate
8.5% → 6.2%
2021 → 2025
Std Dev (THCA)
5.39 → 4.86
Distribution tightening
Year-by-Year Summary
Key metrics across all available years. All values are from real CCC data.
| Metric |
2021 |
2022 |
2023 |
2024 |
2025 |
Mean THCA Potency Trend
Average THCA percentage has climbed steadily year over year.
Mean & Median THCA by Year
THCA Distribution Spread (P10 / P90)
Samples Over 30% THCA
The share of ultra-high potency samples has grown dramatically.
% of Samples Over 30% THCA
Standard Deviation of THCA
Yeast & Mold Fail Rate Trend
Overall microbial contamination failure rates by year.
YM Fail Rate by Year
Testing Volume by Year
Market Concentration (HHI)
Herfindahl-Hirschman Index measuring lab market concentration. Lower = more competitive.
HHI Score by Year
Active Labs by Year
Monthly THCA Overlay by Year
Monthly average THCA overlaid for each year, showing seasonal patterns and year-over-year lift.