In Germany, sodium, calcium and magnesium chloride and their mixtures are used as de-icing salts in winter roadsmaintenance. With the exception of small municipalities, pre-wetting technologies are used for spreading the salt onthe roadway and de-icing salts are usually found in the months of November to April in traffic area runoff waters. Saltconcentrations higher than 10 g/L are sometimes measured in traffic area runoff. These concentrations are significantlyhigher compared with other pollutants and may negatively affect the treatment steps of decentralized stormwatertreatment systems for traffic area runoff. A remobilization of pollutants by the use of each de-icing salt is possible. Toquantify the risk of remobilization, two laboratory-scale test methods were developed. By these methods, the compliancewith legal requirements can be examined during the use of de-icing salts.
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