All of the service charges, connection charges, assessments and other charges, together with the penalties and interest thereon as provided in this chapter, shall be a lien upon the property serviced, superior to all other liens or encumbrances thereon except those for general taxes and local and special assessments. The lien shall be enforced by the city in the manner provided by law. The city may, as an additional and concurrent method of enforcing such liens, cut off the water service from the premises to which the sewer service has been furnished; provided, this method of enforcement shall not be exercised after two years from the date of the recording of sewerage lien notice, as by law provided, except to enforce payment of six months’ charges for which no lien notice is required by law to be recorded.