Kernrechtsfrage
Whether Art. 42 of the 2011 Vaulion sewage regulation unlawfully applied retroactively to owners already connected before 1 January 2011.
Extrahierter Entscheid
The provision can be interpreted to tax all beneficiaries of the 2007 works, including those already connected; this is improper retroactivity and constitutionally permissible.
Extrahierte Begründung
The wording is ambiguous, but the municipality confirmed that the tax targets all connected properties benefiting from the works. Past practice and the prior 2010 regulation showed the same financing intent. Any earlier contributions must be deducted.