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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations <br />(3) Sewage Tanks. The liquid capacity of a graywater septic tank serving a dwelling must be based on <br />the number of bedrooms existing and anticipated in the dwelling served and shall be at least as <br />large as the capacities given in Table VIII. <br />Table VIII — Minimum Septic Tank Capacity for raywater Systems <br />Number of Bedrooms _ <br />Tank 1 <br />Tank 2 <br />Two or less <br />1,000 <br />500 <br />Three <br />1,000 <br />500 <br />Four to Five <br />1,000 <br />1,000 <br />Six to Seven <br />1,000 <br />1,000 <br />Eight to Nine <br />1,500 <br />1,000 <br />Ten or More <br />Septic tank shall be sized as: (2,000 + ((# of bedrooms - <br />9) X 150)). <br />77 Washington County Development Code <br />