Questão jurídica principal
Whether a municipal sewage-fee regulation approved by the cantonal government may be applied retroactively to the period before approval.
Decisão extraída
No. Government approval had constitutive effect, and the municipal resolution contained no express or clearly implied retroactivity; fees could only be levied from approval onward.
Fundamentação extraída
Because the regulation was not binding before governmental approval, retroactive application would require an expressly ordered or clearly intended retroactive effect. The 1974 municipal resolution was silent on commencement and disclosed no clear intent for retroactivity.