Md. Code, Land Use § 15–304

(a) Within a reasonable time after the Commission makes a request, public officials of the State, Montgomery County, and Prince George’s County shall furnish the Commission with available information required for Commission work.

(b) The Washington Suburban Sanitary Commission shall:

(1) make available for Commission use the maps, surveys, engineering information, and other records of the Washington Suburban Sanitary Commission; and

(2) when requested by the Commission, furnish engineering services and advice at cost.