We also offer free maintenance tips to prevent future septic tank failures. To determine the required septic tank size you would need to look at the SEPTIC TANK SIZE to see the required tank size based on daily water volume usage and the WATER QUANTITY USAGE TABLES article which discusses water usage requirements to confirm that you… Septic tank size specifications & requirements: This article provides a septic tank size table to determine the required size or capacity of a septic tank. The typical residential septic tank size required for a given average daily sewage wastewater flow in gallons is provided in a table of septic tank sizes. a a State of Kansas Department of Health and Environment Bulletin 4-2, March 1997 MINIMUM STANDARDS FOR DESIGN AND CONSTRUCTION OF ONSITE WASTEWATER SYSTEMS The size of the septic tank is so designed that the sewage is retained in the tank for 24hrs during which certain biological decomposition by the action of anaerobic bacteria takes place which liquefies and breaks the night soil leaving small quantity of soil which is known as sludge and settles at the bottom of the tank and clear water known If an undersized septic tank exceeds its holding capacity, sewage can back up into your home, so when you’re putting in a septic tank, it’s essential that you take the time to calculate the correct size. The Septic Tank: The standard tank is about $800 – $900 delivered. 1000 gal should be plenty, but some health departments require larger tanks, presumably to accommodate the negligent homeowner who thinks pumping is not required – ever. For larger tanks add a dollar per gallon so a 1250 gallon (next size up) is $800 + $250 = $1050. The size of the septic tank you need depends on the number of bedrooms in the home, number of people living there, the home’s square footage and whether or not water saving fixtures are used. You can use the table below to get some idea of what size septic tank your home requires.