Annex 49 of the decree about the requirements to evacuate used water in waterways
(Abwasserverordnung - AbwV)
Requirements described by DIN EN 858 parts 1 and 2, DIN 1999-100, DIN 1999-101, DIN 1986-3, DIN
1986-30, DIN EN 1610 and codes of practice DWA-M 167 parts 1 and 2 and ATV-M 143 part 6
Do they require car wash stations to have a water treatment plant on site?
of course!