"Data analysis did not reveal any significant differences between the exposed group, i.e. consuming food from contaminated soil, and the control group," the Vaud regional authority said in a statement.
The Vallon plant opened in 1958 and was initially welcomed as a way of dealing with the city's garbage.
The dioxin pollution dates from before 1982, when the filters were upgraded.
After the problem was discovered, the Vaud cantonal authorities issued recommendations to restrict the consumption of eggs, vegetables and fruit from the affected areas.
Concentric rings of pollution
The problem was discovered by sheer chance in 2021, causing shock in wealthy Switzerland, which prides itself on its pristine mountains, lakes and pastures.
For years, pollution monitoring had focused on air and water; dioxins were never previously found because nobody had been looking for them.
Soil tests across the city showed the affected zone stretched 5.25 kilometres (3.2 miles) inland and measured around 3.6 kilometres across.
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