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# Contaminated Sites Ordinance (CSO)

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- Created on Aug 13, 2026

## Contaminated Sites Ordinance (CSO)

SR 814.680 — Ordinance of 26 August 1998 on the Remediation of Polluted Sites (Contaminated Sites Ordinance, CSO).

[fedlex.data.admin.ch](https://fedlex.data.admin.ch/eli/cc/1998/2261_2261_2261?utm_source=slatesource)

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.

[fedlex.data.admin.ch](https://fedlex.data.admin.ch/eli/cc/1998/2261_2261_2261?utm_source=slatesource)

## 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:

SR 814.01

## 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

[Official text on Fedlex — consolidation of 1 December 2025](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?utm_source=slatesource)