Waters Protection Ordinance
(WPO)

of 28 October 1998 (Status as of 1 February 2023)


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Art. 11 Separation of waste water in buildings

Dur­ing con­struc­tion or sub­stan­tial build­ing al­ter­a­tions, the per­sons re­spons­ible for the build­ings must en­sure that pre­cip­it­a­tion wa­ter and per­man­ent flows of non-pol­luted waste wa­ter are chan­nelled off sep­ar­ately from pol­luted waste wa­ter pri­or to reach­ing the out­side of the build­ing.

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