When It Rains, Why Does My Septic Tank Overflow? Septic tanks are designed to treat contaminated water coming from a house. This water is sent back into the ground after it has been filtered through a natural filtration system of soil. During heavy rain, the soil becomes overinfused, which can lead to the overflowing of your septic tank. As soon as your septic tank backs up or fills up after heavy rains, make sure you contact emergency septic pumping in Roseville before any serious mess is created.
How does rain affect your septic tank? Yes, septic tanks fill up after or during heavy rain. The Septic tank collects all the wastewater from your house into it through an inlet pipe. The tank located inside the ground stores all the waste. The partially treated wastewater goes to the drain field from this tank. From there, it makes its way into the soil where it gets cleaned and treated by microbes before being released to groundwaters.