Criteria for Triggering a Review of an Established EQS

If only technical aspects are considered as triggers for EQS reviews, a few criteria emerge, such as age of the EQS, the number of data, the presence of new data, and the availability of new derivation techniques. Regular exceedance of the EQS may also be a trigger to search for new data with which to derive a possibly more robust standard. 

Metals (Australian example) Ammonia (United States) 

Lead (European Union) Mercury (European Union) Hexachlorobenzene (European Union) Hexachlorobutadiene (European Union) 

EU Water Framework Directive EU Water Framework Directive 

Environmental and Human Health Standards for Water and Soil 

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