Septic Tank Capacity vs. Usage
Typical residential septic tank size required for given average daily sewage flow in gallons. Links to related septic system testing and design information.
|
Average sewage flow gallons per day
|
Minimum Gallons Effective Capacity(1)
|
|
0-500
|
900
|
|
601-700
|
1200
|
|
801-900
|
1500
|
|
1001-1240
|
1900
|
|
2001-2500
|
3200
|
|
4501-5000
|
5800
|
(1) Source: Florida ASHI Seminar, Kissimmee, October 1993, included sheet from Environmental Health Services, March 17, 1992. Some intermediate table entries were eliminated but can be recalculated by interpolation. In most U.S. jursidictions we surveyed, the minimum permitted tank size for new septic installations is 1000 gallons. Special site considerations may require design by a septic-engineer before local health departments can approve nn installation.