waste water from the bathroom tub or shower is discharged through a drain line 50 to a vertical drain line 52 into sump pit 40 similarly waste water from the lavatory is discharged through a drain line 54 to drain line 52 and then into the sump pit a sump pump 56 in the sump pit handles any overload that is where the water is not percolating into the ground from the sump pit quickly enough the pump delivers overload water from the sump pit through a drain line 58 to an outside area above ground level 60 such as another collection area for percolating into the ground thus it can be seen that all the sources of waste water that is from the tub and shower the lavatory and the washer are all discharged into the sump pit and then percolated into the ground in some cases it may be convenient to discharge the waste water directly to an outside collection area not shown bypassing the sump pit similarly storm water is discharged into the sump pit and into the ground any overload from the sump pit is discharged outside of the residential structure all the solids from the water closet and the kitchen sink are discharged to the main sewer system preferably through an inclined or horizontal conduit supported several feet above the basement floor 0022 fig2 illustrates another version of the invention.