Said sewer rents shall be payable, collectible and enforceable in
the manner provided by law for the payment, collection and enforcement
of annual Village taxes in the Village of Monticello, and, if unpaid
on the grace date therefor, shall constitute a lien upon the real
property, and such lien shall be proper and superior to every other
lien or claim except a lien of an existing tax, water charge or local
assessment.