{"id":40195,"date":"2025-09-01T23:00:00","date_gmt":"2025-09-01T21:00:00","guid":{"rendered":"https:\/\/www.efk.admin.ch\/?post_type=audit&p=40195"},"modified":"2025-08-29T16:33:46","modified_gmt":"2025-08-29T14:33:46","slug":"gestion-du-site-contamine-de-lancienne-decharge-de-gamsenried","status":"publish","type":"audit","link":"https:\/\/www.efk.admin.ch\/fr\/audit\/gestion-du-site-contamine-de-lancienne-decharge-de-gamsenried\/","title":{"rendered":"Gestion du site contamin\u00e9 de l\u2019ancienne d\u00e9charge de Gamsenried"},"content":{"rendered":"\n

L\u2019ancienne d\u00e9charge de Gamsenried est situ\u00e9e entre Vi\u00e8ge et Brigue dans le canton du Valais. Durant plusieurs d\u00e9cennies, des d\u00e9chets chimiques y ont \u00e9t\u00e9 d\u00e9pos\u00e9s, principalement par l\u2019entreprise Lonza. Sa dimension et les substances pr\u00e9sentes en font le site contamin\u00e9 le plus grand et le plus complexe de Suisse.

Le Service de l\u2019environnement du canton du Valais est l\u2019autorit\u00e9 charg\u00e9e de mettre en oeuvre l\u2019assainissement. Plusieurs acteurs de la Conf\u00e9d\u00e9ration sont impliqu\u00e9s, \u00e0 diff\u00e9rents niveaux. Il s\u2019agit de l\u2019Office f\u00e9d\u00e9ral de l\u2019environnement (OFEV), en charge de la surveillance de la mise en oeuvre du droit f\u00e9d\u00e9ral dans le domaine des sites pollu\u00e9s, et de l\u2019Office f\u00e9d\u00e9ral des routes (OFROU), qui poss\u00e8de environ un tiers des parcelles pollu\u00e9es sur lesquelles se trouve l\u2019autoroute A9. L\u2019Office f\u00e9d\u00e9ral des transports (OFT), la soci\u00e9t\u00e9 Matterhorn-Gotthard Bahn, les CFF ainsi que Swissgrid sont aussi impliqu\u00e9s. Le projet de troisi\u00e8me correction du Rh\u00f4ne, subventionn\u00e9 \u00e0 deux tiers par la Conf\u00e9d\u00e9ration, est indirectement concern\u00e9.

La dimension et la complexit\u00e9 du site expliquent en partie qu\u2019aucun projet d\u2019assainissement global n\u2019existe actuellement. Ainsi, ni les mesures d\u2019assainissement, ni les \u00e9tapes, ni les d\u00e9lais, ni m\u00eame les co\u00fbts ne sont connus. Le canton du Valais porte la responsabilit\u00e9 qu\u2019un projet global soit \u00e9tabli et l\u2019entreprise Lonza devra supporter la plus grande partie des co\u00fbts en raison du d\u00e9p\u00f4t de d\u00e9chets durant de nombreuses ann\u00e9es.

Le Contr\u00f4le f\u00e9d\u00e9ral des finances (CDF) a audit\u00e9 la gestion de l\u2019assainissement, du point de vue de la Conf\u00e9d\u00e9ration. Le principal constat du pr\u00e9sent rapport est l\u2019absence d\u2019une vision d\u2019ensemble des risques et d\u2019un suivi coordonn\u00e9 des diff\u00e9rentes entit\u00e9s f\u00e9d\u00e9rales impliqu\u00e9es. Chacune se tient inform\u00e9e du projet et agit selon ses bases l\u00e9gales seulement lorsqu\u2019elle est sollicit\u00e9e. Cette mani\u00e8re de proc\u00e9der ne permet pas une action coordonn\u00e9e et concert\u00e9e de la part de la Conf\u00e9d\u00e9ration.<\/p>\n\n\n\n

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