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As a result of the draft screening assessment, the Government is proposing that 6 substances in the NSAs Group are not harmful to human health or to the environment at levels of exposure considered in the assessment.

In an effort to increase transparency and to facilitate access to information on substances in Canadian commerce, the Government of Canada is publishing a summary of the information received in response to the Notice with respect to perfluorohexane sulfonic acid, its salts and its precursors (PFHxS). The notice was published on October 10, 2020 in the Canada Gazette, Part I, pursuant to paragraph 71(1)(b) of the Canadian Environmental Protection Act, 1999 (CEPA). The initiative collected information on perfluorohexane sulfonic acid, its salts and its precursors (PFHxS) for the purposes of assessing whether to control, or the manner in which to control, the risks posed by these substances. The notice required manufacturers, importers, exporters and those who used PFHxS in the manufacture of a mixture, product or manufactured item to report commercial quantities and use patterns, including mixtures, products and manufactured items containing these substances.

This study examined the effect of two dinonylnaphthalene sulfonic acids (NSAs) on freshwater organisms: calcium dinonylnaphthalene sulfonate (CaDNS), and dinonylnaphthalene disulfonic acid (DNDS). Chronic effects were characterized by exposing fertilized fathead minnow eggs to sediment-associated NSAs and measuring various developmental and growth endpoints for 21 days. Citation: Matten KJ, Parrott JL, Bartlett AJ, Gillis PL, Milani D, Toito J, Balakrishnan VK, Prosser RS. Toxicity of dinonylnaphthalene sulfonates to Pimephales promelas and epibenthic invertebrates.

Questions and answers regarding the uses of Naphthalene and actions taken to protect the public and the environment.

Naphthalene belongs to a group of chemicals called polycyclic aromatic hydrocarbons. These chemicals are found in fossil fuels and are also formed as by-products of the combustion of biomass and fossil fuels. Naphthalene usually occurs in solid form, but can also be released as a gas to indoor air at room temperature. Most of the exposure to naphthalene occurs though breathing air in the home and other buildings.

The Canadian Environmental Sustainability Indicators (CESI) program provides data and information to track Canada's performance on key environmental sustainability issues. The Perfluorooctane sulfonate in fish and water indicators provide information on the presence of perfluorooctane sulfonate (PFOS) in the environment and indications of the progress of strategies and policies to reduce or control their occurrence in the environment. These indicators identify the drainage regions where concentrations are below or above the Federal Environmental Quality Guidelines for PFOS in fish and water. Information is provided to Canadians in a number of formats including: static and interactive maps, charts and graphs, HTML and CSV data tables and downloadable reports.

The Canadian Environmental Sustainability Indicators (CESI) program provides data and information to track Canada's performance on key environmental sustainability issues. The Perfluorooctane sulfonate in fish and water indicators provide information on the presence of perfluorooctane sulfonate (PFOS) in the environment and indications of the progress of strategies and policies to reduce or control their occurrence in the environment. These indicators identify the drainage regions where concentrations are below or above the Federal Environmental Quality Guidelines for PFOS in fish and water. Information is provided to Canadians in a number of formats including: static and interactive maps, charts and graphs, HTML and CSV data tables and downloadable reports.

The Canadian Environmental Sustainability Indicators (CESI) program provides data and information to track Canada's performance on key environmental sustainability issues. The Perfluorooctane sulfonate in fish and water indicators provide information on the presence of perfluorooctane sulfonate (PFOS) in the environment and indications of the progress of strategies and policies to reduce or control their occurrence in the environment. These indicators identify the drainage regions where concentrations are below or above the Federal Environmental Quality Guidelines for PFOS in fish and water. Information is provided to Canadians in a number of formats including: static and interactive maps, charts and graphs, HTML and CSV data tables and downloadable reports.

Hazardous Substance Assessments are prepared by Health Canada as educational and information resources.

This guideline technical document reviews and assesses all identified health risks associated with PFOS in drinking water. It incorporates available studies and approaches and takes into consideration the availability of appropriate analytical methods and treatment technology. Based on this review, the drinking water guideline for PFOS is a maximum acceptable concentration (MAC) of 0.0006 mg/L (0.6 µg/L), based on the general population.