Final answer:
Stormwater, rainwater, or groundwater should not be drained into a septic tank, as it is designed for domestic wastewater treatment and excess water can cause system overload and potential pollution.
Step-by-step explanation:
Stormwater, rainwater, or groundwater should not be drained into a septic tank. A septic tank is designed for the treatment of domestic wastewater, not for rain or groundwater, which can disrupt the system. Septic tanks include a sewer line from the house, the tank itself where sludge settles and organic solids are decomposed anaerobically, and a drain field where treated water seeps into the soil. Introducing large amounts of stormwater or groundwater can overload the system, reducing its effectiveness and potentially leading to the malfunction of the septic tank and subsequent water pollution problems.