Questione giuridica chiave
Whether the cantonal court violated municipal autonomy by treating the changed billing period as an impermissible double charge.
Decisione estratta
Yes. The municipality could change the billing system so long as the fees matched actual consumption; no unlawful double billing arose.
Motivazione estratta
Periodic water and wastewater user fees are causal charges tied to actual use, not taxes governed by matching assessment and tax periods. The new transitional system covered consumption continuously and did not charge the same consumption twice.