Md. Code, General Provisions § 4–338

(a) (1) In this section the following words have the meanings indicated.

(2) “Community sewerage system” has the meaning stated in § 9–501 of the Environment Article.

(3) “Community water system” has the meaning stated in § 9–401 of the Environment Article.

(4) (i) “Critical infrastructure” has the meaning stated in § 1–101 of the Environment Article.

(ii) “Critical infrastructure” includes:

1. a community sewerage system; and

2. a community water system.

(5) “Operational technology” has the meaning stated in § 9–2701 of the Environment Article.

(b) A custodian shall deny inspection of the part of a public record that contains information about the security of an information system, operational technology, or critical infrastructure, including any records of a community water system or community sewerage system.