California DTSC Proposes New Requirements for 1,4-Dioxane in Shampoos and Dish Detergents

The California Department of Toxic Substances Control (DTSC) is proposing to designate manual dish detergents and shampoos containing more than 1 ppm of 1,4-dioxane as “Priority Products” under the Safer Consumer Products program.

If finalized, this designation would introduce new regulatory obligations for manufacturers of affected products sold in California.

Key elements of the proposal

• Products containing greater than 1 ppm of 1,4-dioxane would be subject to DTSC notification requirements
• Manufacturers may be required to either reformulate to ≤1 ppm, discontinue sale in California, or conduct an Alternatives Analysis (AA)
• DTSC review of Alternatives Analyses may lead to additional compliance measures

This proposal could increase the need for analytical testing, supplier verification, and supply chain controls for affected product categories.

Important timing

The public comment period is currently open and is scheduled to close:

March 2, 2026 at 11:59 PM PT

What companies should consider

• Assess whether products may contain 1,4-dioxane above 1 ppm
• Review current testing and supplier documentation
• Evaluate potential reformulation or risk mitigation strategies
• Consider submitting comments to DTSC

More information and comment submission:
https://calsafer.dtsc.ca.gov/cms/commentpackage/?rid=12794

EAS will continue monitoring this proposal and provide updates as it progresses.