ARSD 74:53:01:38. Requirements for graywater system

A graywater system shall be designed in accordance with the following criteria: (1) All graywater treatment and recycle systems shall be located in accordance with the distances specified in § 74:53:01:19, Table 1; (2) Design of graywater systems for homes or cabins shall be based on a minimum graywater flow of 25 gallons per day per person. Three days retention time shall be provided for each graywater tank. For other facilities, the design flow shall be specified on a case-by-case basis by the secretary; (3) Graywater tanks are septic tanks and shall conform to the requirements for septic tanks as specified in § 74:53:01:23; (4) Effluent from graywater systems may be recycled for toilet use, conveyed to absorption fields, mounds, or seepage pits, or used for irrigation of lawns and areas not intended for food production. Percolation tests shall be conducted and the minimum size of absorption area shall be determined in accordance with §§ 74:53:01:29 to 74:53:01:32, inclusive.