Maryland Business Occupations and Professions Section 12-502

      (a)      Regardless of whether plumbing services are provided for compensation, a person who provides or assists in providing plumbing services shall comply with the State Plumbing Code or any applicable local plumbing code.

      (b)      To ensure that plumbing services provided in a State building meet or exceed the standards of the State Plumbing Code, the plumbing work shall be inspected:

            (1)      to the extent money is provided in the State budget, by a State plumbing inspector; or

            (2)      if not inspected by a State plumbing inspector, by an inspector of the county or local government where the plumbing services are provided.