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Waters Protection Ordinance (WPO) (WPO)
SR 814.201 — Waters Protection Ordinance of 28 October 1998 (WPO).
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:NOTE [links:https://fedlex.data.admin.ch/eli/cc/1998/2863_2863_2863]
English is not an official language of the Swiss Confederation. This translation is provided for information purposes only and has no legal force.
English consolidation of 1 December 2025, which is also the date of the current binding text.

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Preamble
The Swiss Federal Council,
based on Articles 9, 14 paragraph 7, 16, 19 paragraph 1, 27 paragraph 2, 36a paragraph 2, 46 paragraph 2, 47 paragraph 1 and 57 paragraph 4 of the Waters Protection Act of 24 January 1991 (WPA),
ordains:
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:NOTE
SR 814.20
Amended by No I of the O of 4 May 2011, in force since 1 June 2011 (AS 2011 1955).

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Contents
1. General Provisions — 2 articles
2. Disposal of Wastewater — 15 articles
3. Disposal of Sludge — 4 articles
4. Requirements for Animal Husbandry Farms — 6 articles
5. Protection for Waters in terms of Area Planning — 5 articles
6. Maintaining Appropriate Rates of Residual Water Flow — 10 articles
7. Prevention and Remediation of Other Harmful Effects on Waters — 16 articles
8. Enforcement — 10 articles
9. Federal Wastewater Charge — 4 articles
10. Payment of Federal Contributions — 19 articles
11. Commencement — 1 article
12. Transitional Provision to the Amendment of 18 October 2006 — 0 articles
13. Transitional Provisions to the Amendment of 4 May 2011 — 0 articles
14. Transitional Provision to the Amendment of 25 May 2011 — 0 articles
15. Transitional Provision to the Amendment of 4 November 2015 — 0 articles
16. Transitional Provision to the Amendment of 16 December 2022 — 0 articles
17. Transitional Provision to the Amendment of 29 October 2025 — 0 articles

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Official text on Fedlex — consolidation of 1 December 2025