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Major Accidents Ordinance (MAO)
SR 814.012 — Ordinance of 27 February 1991 on Protection against Major Accidents (Major Accidents Ordinance, MAO).
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:NOTE [links:https://fedlex.data.admin.ch/eli/cc/1991/748_748_748]
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 October 2025, which is also the date of the current binding text.

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Preamble
The Swiss Federal Council,
on the basis of Articles 10 paragraph 4 and 39 paragraph 1 of the Federal Actof 7 October 1983 on the Protection of the Environment (EPA)and Article 47 paragraph 1 of the Waters Protection Act of 24 January 1991,
ordains:
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:NOTE
SR 814.01
SR 814.20
Amended by No I of the O of 13 Feb. 2013, in force since 1 April 2013 (AS 2013 749).

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Contents
1. General Provisions — 2 articles
2. Principles of Prevention — 9 articles
3. Response to Major Accidents — 1 article
4. Coordination with Spatial Planning Activities — 1 article
5. Responsibilities of the Cantons — 5 articles
6. Responsibilities of the Confederation — 5 articles
7. Final Provisions — 7 articles

:LINK
https://fedlex.data.admin.ch/filestore/fedlex.data.admin.ch/eli/cc/1991/748_748_748/20251001/en/html/fedlex-data-admin-ch-eli-cc-1991-748_748_748-20251001-en-html-2.html
Official text on Fedlex — consolidation of 1 October 2025