Maryland Code, Local Government § 16-113

(a) In Allegany County, an entity that provides water or sewer services to the public on a nonprofit basis shall have a lien against the property to which the service was supplied if the charges for the services are not paid.

(b) A lien under this section is subject to the requirements for a mechanic's lien on real property, including the requirement to record the lien among the appropriate land records.