Septic System Design

Florida Administrative Code 64E-6 (F.A.C. 64E-6) addresses all of the requirements for septic systems. Go to: www.doh.state.fl.us/environment/ostds/pdfiles/forms/64e620070924.pdf to view the code. Septic systems are sized based on the number of bedrooms or the living space square-footage, whichever produces the highest sewage flow, and the soil conditions. The soil directly affects the size and type of drainfield required. This is why it is important to have a certified professional soil scientist perform the soil investigation. Visit www.faess.org to locate a professional soil scientist in your area.

The soil texture and seasonal high water table must be accurately determined in order to properly size the drainfield. In addition, severely limiting soil conditions (muck, clay, “hard-pan”) must be identified and described. All of these conditions must be considered and dealt with in the design of the system. In essence, the worse the soil conditions are, the bigger the drainfield will be.

Once all necessary information is obtained, the system can be sized and designed. Once designed, the system is plotted onto the site plan that you provide in order to demonstrate that the system meets all appropriate requirements contained within F.A.C. 64E-6. It is best to have a surveyor develop the site plan in order to ensure accuracy in the placement of all proposed construction within the property boundary. Most of the information that the Health Department requires relates to the site plan. We ensure that all information required for the subject site and adjacent areas is illustrated and clearly labeled for easy identification by the Health Department.