Storage tanks

1. Public water systems. Storage equipment for public water systems must be as shown on approved plans and specifications. 2. Private water systems. Storage equipment must be as follows: a. All tanks must be certified under water system council standards for size and pressure. b. Hydropneumatic tanks must have a working pressure rating in excess of the maximum system pressure but not less than seventy-five pounds per square inch [34.02 kilograms per 6.45 square centimeters]. c. All tanks must be coated or made of materials resistant to corrosion. d. All tanks must be constructed of materials or coatings which are nontoxic. e. All tanks must be provided with a means of draining. f. Atmospheric storage tanks must be provided with a cover to prevent the entrance of unauthorized persons, dirt, or vermin. The cover must be vented with a return bend vent pipe having an area not less than the area of the downfeed riser pipe and the vent must be screened with corrosion-resistant screen having not less than fourteen and not more than twenty openings per linear inch [2.54 centimeters].