View an animated, interactive model of how a household septic system works created by the Guadalupe-Blanco River Authority. It is an indicator of human fecal contamination. Coliform bacteria predominantly inhabits the intestines of humans or other warm-blooded animals. Finally, the wastewater percolates into the soil, naturally removing harmful coliform bacteria, viruses and nutrients.If the drainfield is overloaded with too much liquid, it can flood, causing sewage to flow to the ground surface or create backups in toilets and sinks. The soil accepts, treats, and disperses wastewater as it percolates through the soil, ultimately discharging to groundwater. Pretreated wastewater is discharged through piping onto porous surfaces that allow wastewater to filter through the soil. The drainfield is a shallow, covered, excavation made in unsaturated soil.
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