Md. Code, Environment § 9–412.1

(a) A person may not tamper, attempt to tamper, or make a threat to tamper with a public water system.

(b) (1) The Department may bring a civil action against any person who tampers, attempts to tamper, or makes a threat to tamper with a public water system.

(2) The court may impose a civil penalty of not more than $50,000 for actual tampering, or not more than $20,000 for each attempt to tamper.