Md. Code, Environment § 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.