DEA Cracks Down on Fentanyl's Secret Ingredient: Propionyl Chloride Banned
Published Date: 3/10/2026
Rule
Summary
Starting April 9, 2026, propionyl chloride will be officially controlled because it’s used to make illegal fentanyl. Anyone who handles this chemical must register with the DEA and follow new rules, no matter how much they have. This change helps stop dangerous drug production while keeping businesses informed and ready.
Analyzed Economic Effects
9 provisions identified: 1 benefits, 6 costs, 2 mixed.
Must register to handle propionyl chloride
Starting April 9, 2026, anyone who manufactures, distributes, imports, or exports propionyl chloride (including regulated mixtures) must register with the DEA. The rule states separate registrations are required for manufacturing, distributing, importing, and exporting and for each principal place of business.
Registration fees specified
DEA lists annual registration fees of $3,699 for manufacturers and $1,850 for distributors, importers, and exporters. These fees apply to those who must register to handle propionyl chloride.
All quantities and mixtures regulated — no threshold
The rule sets no quantity threshold: all transactions of propionyl chloride are regulated regardless of size, and chemical mixtures containing any amount of propionyl chloride are not exempt at any concentration. The Table of Concentration Limits is amended to state mixtures containing any amount are not exempt.
Temporary registration exemption but reporting rules effective immediately
DEA provides a temporary exemption from the registration requirement if a properly completed registration application or application for mixture exemption is received on or before 30 days after publication of the final rule (i.e., by April 9, 2026). However, all other chemical control requirements, including recordkeeping and reporting, are effective on April 9, 2026.
New recordkeeping, reporting, security, and inspection rules
From April 9, 2026, registrants must maintain records for two years, submit annual manufacturing/inventory/use data if a regulated bulk manufacturer, report suspicious or extraordinary transactions, implement security controls per 21 CFR 1309.71-1309.73, and allow administrative inspections of controlled premises.
Violations subject to civil and criminal penalties
Any activity involving propionyl chloride that is not authorized by or violates the CSA would be unlawful and could subject the person to administrative, civil, and/or criminal action under federal law.
Small number of domestic distributors affected
DEA identified 20 domestic distributors of propionyl chloride; three are already registered and 17 are not registered. DEA notes those 17 are small entities and estimates they represent 0.19% of U.S. businesses in the NAICS 424690 industry; some nonregistered suppliers may stop selling rather than register.
Chemical mixture exemption application process
Manufacturers may apply for an exemption of mixtures under 21 CFR 1310.13; DEA may grant an exemption by final rule if the mixture cannot be easily used for illicit production and the listed chemical cannot be readily recovered.
Warehousemen limited possession exemption
Warehouse operators may lawfully possess list I chemicals without registering if possession is in the usual course of business and they receive the chemical from a DEA registrant and only distribute it back to that registrant and registered location; distributing to others requires registration.
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Key Dates
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