Quality Standards for Organic Trace Substances in Surface Water
In Swiss surface waters, numerous pollutants are regularly detected that can adversely affect aquatic organisms and ecosystem. To assess the water quality in Europe, effect-based values or quality standards are used, below which no adverse effects should occur. In Switzerland, substance-specific effect-based numerical requirements for relevant organic pollutants are to be included in the Water Protection Ordinance.
Quality standards are derived based on the acute and chronic effects of substances on environmental organisms. On behalf of the Federal Office for the Environment, the Ecotox Centre has derived proposals for quality criteria for numerous substances. It has reviewed those proposals for 55 substances and updaed those for which new toxicity data were available. In addition, the proposed quality criteria were externally reviewed. In 2017/2018, DETEC will hold a public hearing. The new ecotoxicological requirements are expected to take effect in the end of 2018.