Septic Tank Size serving individual or small on-site systems shall be determined as follows:
(1) All septic tanks receiving wastewater flows of 750 gallons per day or less shall have a minimum capacity of at least 1,250 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 1,250 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;
(2) 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.
Pennington County On Site Waste Water Application
2009 Rapid City Business of the Year !
R. Chris Howie & Darin R. Howie
