<html> <head> <title>Rule 74:53:01:25 Minimum capacities for septic tanks.</title> <META NAME="Keywords" Content="Administrative Rules 74:53:01:25"> <META NAME="Description" Content="Administrative Rules 74:53:01:25 Minimum capacities for septic tanks."> <meta name=Generator content="Microsoft Office HTML Filter 2.0"> <meta http-equiv=Content-Type content="text/html; charset=windows-1252"> <meta name=Originator content="Microsoft Word 10"> <style> <!-- --> </style> </head> <body lang=EN-US> <div> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>74:53:01:25.&nbsp;&nbsp;Minimum capacities for septic tanks.</b> The minimum capacities for septic tanks serving individual or small on-site systems shall be determined as follows:</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (1)&nbsp;&nbsp;All septic tanks receiving wastewater flows of 750 gallons per day or less shall have a minimum capacity of at least 1,000 gallons of liquid before there will be an overflow into the septic tank outlet. When a housing unit or units served by a septic tank contains more than three bedrooms, each bedroom in excess of three shall require an additional 250-gallon increase in the capacity of the septic tank beyond the 1,000 gallons. If a septic tank receives wastes from a garbage disposal, the overall capacity of the tank shall be increased by an additional 20 percent;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (2)&nbsp;&nbsp;Septic tanks serving premises other than housing units or receiving wastewater flows of more than 750 gallons per day but equal to or less than 1,500 gallons per day shall have a minimum liquid volume capacity to permit retention of incoming sewage at 150 percent of the average daily flow;</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (3)&nbsp;&nbsp;Septic tanks receiving wastewater flows greater than 1,500 gallons per day shall have a minimum liquid volume capacity (V) equal to at least 1,125 gallons plus 75 percent of the daily wastewater flow (Q), or V&nbsp;=&nbsp;1,125 + 0.75Q; and</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (4)&nbsp;&nbsp;Septic tanks serving premises where high amounts of oil or grease are anticipated shall be preceded by grease interceptors. Wastewater from garbage disposals may not be discharged to grease interceptors. Grease interceptors shall have a grease retention capacity of not less than 2 pounds for each gallon per minute of flow. The minimum size of grease interceptors shall be 750 gallons. Construction and installation of interceptors shall meet the requirements of chapter 20:54:06 of the South Dakota state plumbing code.</font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>Source:</b> 12 SDR 2, effective July 18, 1985; 13 SDR 129, 13 SDR 141, effective July 1, 1987; transferred from §&nbsp;74:03:01:62, July 1, 1996.</font></p> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>General Authority:</b> SDCL <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=34A-2-93">34A-2-93.</A></font></p> <p><font size=3 face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>Law Implemented:</b> SDCL <A HREF="/statutes/DisplayStatute.aspx?Type=Statute&Statute=34A-2-20">34A-2-20.</A></font></p> <p><font size=3 face="Times New Roman">&nbsp;</font></p> </div> </body> </html>