Authorization of biocidal products for the disinfection of drinking water in Switzerland
Article 2 (7) of the European Biocidal Products Regulation (BPR) gives individual member states the option to ban or restrict the use of certain biocidal products/active substances for disinfecting drinking water at a national level.
In Switzerland, the FDHA Ordinance on Drinking Water and Water in Public Baths and Shower Facilities (DWBSO; SR 817.022.11) governs biocidal products and procedures that can be authorized for the disinfection of drinking water. The procedures and active substances that are admissible for the disinfection of drinking water in Switzerland are listed in Annex 4 List 2 or List 5 of the DWBSO. Consequently, not all biocidal active substances designated as product type 5 (drinking water disinfectants) in the BPR are admissible for the disinfection of drinking water in Switzerland.
Biocidal active substances that are admissible for the desinfection of drinking water in Switzerland are marked with a "#" (for example: 5#) in the List of active substances published by the Notification Authority for Chemicals. (PDF, 4 MB, 10.01.2023)
Silver (CAS no. 7440-22-4) and silver nitrate (CAS no. 7761-88-8) may not be used in Switzerland as an active substance in biocides for the primary disinfection of drinking water. However, an authorization for inhibiting contamination in cold-water household appliances or in tanks or containers (e.g. for emergency water supplies) is possible. Sodium dichloroisocyanurate (CAS no. 2893-78-9) and sodium dichloroisocyanurate dihydrate (CAS no. 51580-86-0) may only be admissible in biocides for disinfecting emergency water supplies.