:INFO [align:center, links:https://fedlex.data.admin.ch/eli/cc/1998/2261_2261_2261]
Contaminated Sites Ordinance (CSO)
SR 814.680 — Ordinance of 26 August 1998 on the Remediation of Polluted Sites (Contaminated Sites Ordinance, CSO).
|
:NOTE [links:https://fedlex.data.admin.ch/eli/cc/1998/2261_2261_2261]
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.

:INFO
Preamble
The Swiss Federal Council,
based on Article 32c paragraph 1 second sentence and Article 39 paragraph 1 of the Environmental Protection Act of 7 October 1983 (EPA),
ordains:
|
:NOTE
SR 814.01

:INFO
Contents
1. General Provisions — 4 articles
2. Register of Polluted Sites — 3 articles
3. Need for Monitoring and Remediation — 7 articles
4. Objectives and Urgency of Remediation — 2 articles
5. Remediation — 4 articles
6. Obligation to carry out Investigation, Monitoring and Remediation Measures — 1 article
7. Final Provisions — 9 articles

:LINK
https://fedlex.data.admin.ch/filestore/fedlex.data.admin.ch/eli/cc/1998/2261_2261_2261/20251201/en/html/fedlex-data-admin-ch-eli-cc-1998-2261_2261_2261-20251201-en-html.html
Official text on Fedlex — consolidation of 1 December 2025