Md. Code, Environment § 9–4A–02

(a) On or before December 31, 2026, the Department shall adopt regulations to identify a list of additional standards for water quality testing that the Department deems necessary for each county or any specific area within a county.

(b) Regulations adopted in accordance with this subsection may require, as appropriate, testing for:

(1) Manganese;

(2) Arsenic;

(3) Radon;

(4) Mercury; and

(5) Other volatile organic compounds for which there is a maximum contaminant level.