Waters Protection Ordinance (WPO) (WPO)
English is not an official language of the Swiss Confederation. This translation is provided for information purposes only and has no legal force.
Art. 18 Sludge disposal plan
1 The cantons shall draw up a sludge disposal plan and bring it into line with the new requirements within the deadlines imposed by experts. 2 The disposal plan sets the following as a minimum: a. how sludge from the central wastewater treatment plants should be disposed of; b. which procedures, including construction and modification of installations used for disposal of sludge, are required at what time; c. how phosphorus is recovered in accordance with Articles 1 and 15a of the Waste Ordinance of 4 December 2015, unless this process is described in the waste management plan in accordance with Article 4 of the Waste Ordinance. 3 The sludge disposal plan shall be accessible to the public.
Para. 2 let. c — Inserted by No I of the O of 29 Oct. 2025, in force since 1 Dec. 2025 (AS 2025 745). See also the transitional provision to the Amendment of 29.10.2025 at the end of the text. Para. 2 let. c — SR 814.600
Art. 19 Storage facilities
1 Persons responsible for wastewater treatment plants shall ensure that they can store the sludge until environmentally compatible disposal is guaranteed. 2 If sludge from a wastewater treatment plant cannot be disposed of in an environmentally compatible manner at any time, the plant must have a storage capacity of at least two months. 3 ...
Para. 2 — Amended by Annex No 1 of the O of 26 March 2003, in force since 1 Oct. 2006 (AS 2003 940). Para. 3 — Repealed by Annex No 1 of the O of 26 March 2003, with effect from 1 Oct. 2006 (AS 2003 940).
Art. 20 Inspection and obligation to report
1 Persons responsible for wastewater treatment plants must ensure that the quality of sludge is inspected within the deadlines imposed by experts. 2 ... 3 ...
Para. 2 — Repealed by No I of the O of 18 Oct. 2006, with effect from 1 Jan. 2007 (AS 2006 4291). Para. 3 — Repealed by No I of the O of 4 Nov. 2015, with effect from 1 Jan. 2016 (AS 2015 4791).
Art. 21 Supply
1 Persons responsible for central wastewater treatment plants must keep a record of recipients of sludge, the amount supplied, type of disposal declared and time of supply and retain this information for at least ten years and make it available to the authorities on request. 2 ... 3 ... 4 They may only dispose of sludge other than as planned in the cantonal Sludge Disposal Plan with the agreement of cantonal authorities. If sludge is to be disposed of in another canton, the cantonal authorities shall consult the authorities of the receiving canton in advance.
Para. 2 — Repealed by No I of the O of 4 Nov. 2015, with effect from 1 Jan. 2016 (AS 2015 4791). Para. 3 — Repealed by Annex 3 No II 4 of the O of 22 June 2005 on Movements of Waste, with effect from 1 Jan. 2006 (AS 2005 4199).
