Also, do not poison your septic system and the groundwater by pouring harmful chemicals down the drain. They can kill the beneficial bacteria that treat your wastewater. Keep the following materials, nondegradables: grease, disposable diapers, plastics, wet wipes etc and Poisons: gasoline, oil, paint, paint thinner, pesticides, antifreeze, etc out of your septic system.
Do not plan to locate the septic tank or drain field under a patio, garage, storage building, driveway, parking lot, sidewalk, or other paved area.