Under EU law (), towns and cities are required to collect and treat their , as untreated waste water can put human health at risk and pollute lakes, rivers, soil and coastal and groundwater.
ELi igusaktide () kohaselt peavad linnad koguma ja puhastama , kuna puhastamata reovesi vib ohustada inimeste tervist ja saastada jrvi, jgesid, pinnast ning ranniku- ja phjavett.