6506. TESTING FOR RESIDUAL SOLVENTS

6506 TESTING FOR RESIDUAL SOLVENTS 6506.1 Cultivation centers and manufacturers shall test all products for residual solvents and processing chemicals in accordance with this section before distributing, selling, or otherwise transferring the product to an internet retailer, manufacturer, or retailer. 6506.2 The testing laboratory shall analyze at minimum 0.25 grams of the representative sample of cannabis product or pre-rolls to determine whether residual solvents or processing chemicals are present. 6506.3 The testing laboratory shall report the result of the residual solvents and processing chemicals testing in unit micrograms per gram (μg/g) in the testing results and indicate “pass” or “fail” in the result report. 6506.4 The sample shall be deemed to have passed the residual solvents and processing chemicals testing if the presence of any residual solvent or processing chemical listed in the following tables in Category I and Category II does not exceed the indicated critical limit, except that: The critical limit for ethanol does not apply to cannabis products that are tinctures; and The critical limit for ethanol or isopropyl alcohol does not apply to cannabis products that are topical cannabis products. Category I Residual Solvent or Processing Chemical CAS No. Cannabis Product or Pre-Roll Critical Limit (μg/g) 1,2-Dichloroethane 107-06-2 1.0 Benzene 71-43-2 1.0 Chloroform 67-66-3 1.0 Ethylene oxide 75-21-8 1.0 Methylene chloride 75-09-2 1.0 Trichloroethylene 79-01-6 1.0 Category II Residual Solvent or Processing Chemical CAS No. Cannabis Product or Pre-roll Action Level (μg/g) Acetone 67-64-1 5000 Acetonitrile 75-05-8 410 Butane 106-97-8 5000 Ethanol 64-17-5 5000 Ethyl acetate 141-78-6 5000 Ethyl ether 60-29-7 5000 Heptane 142-82-5 5000 Hexane 110-54-3 290 Isopropyl alcohol 67-63-0 5000 Methanol 67-56-1 3000 Pentane 109-66-0 5000 Propane 74-98-6 5000 Toluene 108-88-3 890 Total xylenes (ortho-, meta-, para-) 1330-20-7 2170 6506.5 If the sample fails residual solvents and processing chemicals testing, the batch from which the sample was collected fails residual solvents and processing chemicals testing and shall be deemed adulterated. SOURCE: Final Rulemaking published at 73 DCR 002136 (February 20, 2026). District of Columbia Municipal Regulations Medical Cannabis 22-C DCMR § 6506