California PFAS Pesticide Ban Proposal Sets 2030 and 2035 Phase-Out Deadlines

PFAS Regulation Introduces Phased Pesticide Restrictions

Under AB 1603, the California Department of Pesticide Regulation would be prohibited from registering or reregistering pesticides containing intentionally added PFAS.

The proposal introduces a staged regulatory approach:

From 1 January 2028, PFAS-containing pesticides could only be sold if labels include a mandatory warning about environmental contamination risks.

By the same date, these products would be classified as "restricted materials", requiring permits and public disclosure of use.

From 1 January 2030, specific PFAS active ingredients, including substances such as bifenthrin, fipronil, and indoxacarb, would be banned from manufacture, sale, and use.

From 1 January 2035, the ban would extend to all pesticides containing intentionally added PFAS.

The Department would also gain authority to impose location-specific restrictions or outright prohibitions before the full ban takes effect.

Health and Environmental Risks Driving PFAS Regulation

The bill is underpinned by growing evidence of PFAS exposure risks. Legislative findings highlight that PFAS are persistent, bioaccumulative chemicals linked to kidney and liver damage, immune system disruption, and certain cancers.

According to the text on page 3, PFAS contamination is widespread, with an estimated 45 percent of US tap water affected and 98 percent of Americans having detectable levels in their blood. In California alone, PFAS have been detected in the drinking water of around 25 million people.

The bill also cites agricultural exposure, noting that approximately 2.5 million pounds of PFAS pesticide active ingredients are applied annually in the state.

Implications for Agriculture and Chemical Supply Chains

AB 1603 signals significant compliance challenges for agrochemical producers, distributors, and farmers. Companies will need to assess product portfolios for PFAS content, reformulate products, and prepare for phased market withdrawal.

The classification of PFAS pesticides as restricted materials introduces additional administrative burdens, including permitting requirements and public disclosure obligations.

The measure could also influence broader US PFAS regulation by setting a precedent for class-based restrictions in pesticide applications, particularly where alternatives are limited.

Next Legislative Steps for AB 1603

Following its amendment in March 2026, AB 1603 will proceed through the California legislative process, including committee review, stakeholder hearings, and floor votes in both the Assembly and Senate. If approved by both chambers, the bill would be sent to the Governor for signature or veto.

Further amendments remain possible during this process, particularly in response to industry, environmental, and agricultural stakeholder input. Implementation timelines and scope may therefore evolve before final enactment.

Summary

California's AB 1603 proposes a phased ban on PFAS in pesticides, combining labelling, restrictions, and full prohibition by 2035. The measure reflects rising concern over PFAS exposure and signals stricter chemical controls that could reshape agricultural inputs and supply chains.