Car washes and car wash stations
Every time a car is washed, fuel residues, road dust, heavy metals and tire wear are washed off and can pollute groundwater.
Many lower water authorities and district offices classify car washes and car wash areas as wastewater areas with special attention, i.e. as AwSV facilities, or only one separator is available for the active areas of the refueling areas and the areas of the washing pads. The wastewater generated must be cleaned in accordance with the requirements of the Water Resources Act (WHG) and freed from substances hazardous to water. The necessary treatment facilities, such as oil separators, are usually located at the end of the drainage system. The entire drainage line up to this point must be designed as an assured line in accordance with TRwS 981. As a rule, welded piping is provided.