How far below the liquid level does the inlet baffle extend in a septic tank?

The inlet baffle in a septic tank is designed to prevent the solid waste and scum layers from entering the outlet of the tank, which could lead to clogging the drain field. The standard and most effective depth that the inlet baffle extends below the liquid level is typically 6 inches. This depth is sufficient to allow for the proper separation of the scum and the liquid waste in the tank, while also ensuring that the baffle functions effectively to direct the flow of incoming wastewater. By extending 6 inches below the liquid level, the baffle helps maintain the integrity of the tank’s function, ensuring that only appropriately treated effluent leaves the septic system.