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P LUMBING C ODE § 5F-3-3 Section 5F-3-3. Drainage (plumbing) systems. (a) Drainage systems that have openings below the base flood elevation shall be provided with an automatic backwater valve installed in each discharge line passing through a building exterior wall, except backwater valves may be deleted if the fixture drainage openings are located at or above a floor level which is above the surrounding ground level. (b) Drainage systems for emergency servicing facilities that are required to remain in operation during a flood shall be provided with a sealed holding tank and the necessary isolation and diversion piping and appurtenances to withhold or postpone sewage discharge to the sewer system during the flood. The holding tank shall be sized for storage of at least one hundred fifty percent of the anticipated demand for a twenty-four hour period. Vents provided for such holding tank shall terminate at an elevation of at least one foot above the base flood elevation. (c) All pipes in a plumbing vent system shall terminate at an elevation of at least one foot above the base flood elevation. (d) All pipe openings through exterior walls below the base flood elevation shall be floodproofed to prevent infiltration of flood water through spaces between pipes and wall construction materials by use of embedded collars, sleeves, waterstops, or other means as may be approved by the authority having jurisdiction. (2020, ord 20-61, sec 6.) 5F-3-3 Section 5F-3-4. Private sewage disposal/treatment. An individual private sewage disposal system or a treatment facility may be permitted in a special flood hazard area when the design and location of such system or facility is approved by the State department of health. In addition to complying with public health regulations and administrative rules of the State department of health, any such new or replacement sewage disposal system shall be designed to minimize or eliminate infiltration of flood waters into the system and discharges from the system into flood waters. (2020, ord 20-61, sec 6.) 5F-3-4 Section 5F-3-5. Water supply systems. (a) Potable water supply systems that are located in a special flood hazard area shall be designed and installed in such a manner as to prevent contamination from flood waters up to the base flood elevation. Location and construction of private water supply wells shall comply with rules and regulations of the department of water supply of the County of Hawai‘i. (b) Potable water supply tanks, filters, softeners, heaters, and all water-supplied appliances and fixtures located below the base flood elevation shall be protected against contamination by covers, walls, copings, or castings. All vent pipes serving the water supply system shall terminate at an elevation of at least one foot above the base flood elevation. SUPP. 11 (1-2022) 5F-13