Md. Code, Environment § 9–608

(a) Each district, its income, its property, and its incorporation are exempt from any State or local taxation or assessments.

(b) The bonds issued under this subtitle, their transfer, the interest payable on them, and any income derived from them, including any profit realized in their sale or exchange, shall be exempt at all times from every kind and nature of taxation by this State or by any of its political subdivisions, municipal corporations, or public agencies of any kind.

(c) When making required filings of corporate documents, each district may be required to pay the usual:

(1) Filing fees;

(2) Recording fees; and

(3) Service charges.