Maryland Environment Section 7-256
§ 7-256.
  (a)   At any reasonable time, a representative of the Department or a representative of the health department of the political jurisdiction where the hazardous substance facility is located may enter any hazardous substance facility:
    (1)   To inspect the hazardous substance facility;
    (2)   To obtain water, waste, soil, or air samples;
    (3)   To drill test wells; and
    (4)   To measure the volume and kinds of substances that are received, treated, stored, or disposed of.
  (b)   If a municipality in which a hazardous substance facility is located does not have a health department, the mayor of the municipality may designate the municipal agency that may enter and inspect a hazardous substance facility under this section.