The term “water main” and the term “system of water mains,” as used herein in connection with the County Commissioners of Baltimore County, shall mean any pipe or pipes intended by said County Commissioners to supply any of the inhabitants of Baltimore County with water for domestic or manufacturing purposes or to afford any of said inhabitants with protection against fire. P.L.L., 1927, §914 1938, §1194 1949, §790 1969, §25-29 1922, ch. 289