(A) The potable water supply made available to premises served by the public water supply shall be protected from possible contamination as specified herein. Any water outlet which could be used for potable or domestic purposes and which is not supplied by the potable system must be labeled in a conspicuous manner as follows.
WATER UNSAFE FOR DRINKING
(B) Minimum acceptable sign shall have black letters at least one inch high located on a red background.
(`83 Code, § 8-109)