15 Miss. Code. R. 18-77-5.1.9 - Septic Tank Sizing

The effective liquid capacity of septic tanks for dwellings shall be based on the number of bedrooms proposed or anticipated as shown in the table below:

Number of Bedrooms	Number of Occupants	Minimum Effective Liquid Capacity (gallons) without baffle or effluent filter	Minimum Effective Liquid Capacity (gallons) with baffle or effluent filter
2 or less	4 or less	750	750
3	6	900	900
4	8	1200	1000
5	10	1500	1250
6	12	1800	1500

For each additional bedroom add 260 gallons

For each additional occupant over 2 per bedroom add 130 gallons

For a nonresidential application, the septic tank will be sized at twice the estimated daily flow

Notes

15 Miss. Code. R. 18-77-5.1.9

Miss Code Ann. § 41-67-3