Waters Protection Ordinance
(WPO)

English is not an official language of the Swiss Confederation. This translation is provided for information purposes only and has no legal force.

of 28 October 1998 (Status as of 1 January 2021)


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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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