Maryland Environment Section 13-301
§ 13-301.
  (a)   Except as otherwise provided in this title, a person shall be licensed by the Board before the person may practice well drilling in this State.
  (b)   A person who has not been licensed by the Board may, after having notified the county board of health, install a temporary dewatering device to facilitate the installation of underground utilities if the device:
    (1)   Is installed 30 feet or less below the ground surface;
    (2)   Is not located in any trench used for the installation of underground utilities;
    (3)   Contains no mechanical pumping equipment below the surface; and
    (4)   Is removed no more than 30 days after installation.
  (c)   A person installing a temporary dewatering device under subsection (b) of this section shall restore the subsurface conditions of the installation area as nearly as possible to the conditions that existed before the installation.