Canada Adds Chlorhexidine and Its Salts to Part 2 of CEPA’s Schedule 1

On February 12, 2025, the Government of Canada officially added 2,4,11,13-tetraazatetradecanediimidamide, N,N″-bis(4-chlorophenyl)-3,12-diimino-(chlorhexidine) and its salts to Part 2 of Schedule 1 under the Canadian Environmental Protection Act, 1999 (CEPA) through Order SOR/2025-13. This regulatory action, published in the Canada Gazette, follows scientific assessments that identified environmental risks associated with chlorhexidine compounds, prompting the government to prioritize pollution prevention actions for these substances.

Why is Chlorhexidine Now Considered Toxic?

In 2019, a screening assessment conducted by Environment and Climate Change Canada (ECCC) and Health Canada concluded that chlorhexidine (CAS no 55-56-1) and its salts meet the environmental toxicity criteria outlined in paragraph 64(a) of CEPA. Key findings highlighted that:

• Chlorhexidine persists in aquatic environments and poses long-term risk to aquatic and benthic organisms, with algae being particularly sensitive.

• Although its bioaccumulation potential is low, the substance remains in water, sediment, and soil for prolonged periods of time.

• Releases primarily come from consumer use, wastewater discharge, and industrial formulation processes.

Despite these environmental concerns, the assessment found no significant risks to human health at current exposure levels from products such as antiseptics, cosmetics, and disinfectants.

Regulatory Impact and Next Steps

The addition of chlorhexidine and its salts to Part 2 of Schedule 1 allows the government to develop pollution prevention measures, which may include restrictions or prohibitions on certain uses. Unlike substances listed in Part 1 of Schedule 1, which require immediate bans or severe restrictions, substances listed in Part 2 are managed through targeted risk reduction strategies.

Canada’s Chemicals Management Plan (CMP) will now oversee the development of risk management measures, with stakeholder consultations expected before any final regulations come into effect. The government has also taken steps to:

• Include chlorhexidine in the National Pollutant Release Inventory (NPRI), which requires industry to report its environmental releases.

• Establish an Environmental Performance Agreement (EPA) with industrial formulators to limit chlorhexidine discharges to wastewater.

International and Domestic Context

While Canada has now classified chlorhexidine and its salts as toxic to the environment, regulatory actions vary worldwide:

• United States: Chlorhexidine digluconate is under review by the U.S. Environmental Protection Agency (EPA) for its safety as an antiseptic.

• European Union: Chlorhexidine is registered under REACH (Registration, Evaluation, Authorisation, and Restriction of Chemicals) to monitor its effects on human health and the environment.

• Canada: The country will now prioritize pollution prevention strategies while continuing to allow the use of chlorhexidine in medical and personal care products.

What Happens Next?

The Canadian government is expected to initiate consultations with industry stakeholders, environmental groups, and health agencies to develop risk management tools. These measures could range from manufacturing and disposal guidelines to specific restrictions in industrial applications.

The full regulatory order can be accessed in the Canada Gazette here, and stakeholders have until April 14, 2025, to submit comments on future risk management plans.