The present Ordinance implements the EU-directive 91/271/ of 21 May 1991 on urban waste water treatment. The text consists of 11 articles as follows: Purpose and sphere of application (1); Definition of terms (2); Catchment area (3); Canalisation (4); Discharge of municipal waste water (5); Discharge of waste water resulting from precipitations (6); Discharge of industrial waste water in public waters (7); Discharge of industrial waste water into canalisation (8); Monitoring and reports (9); Fur