https://civilgang.com/concrete-septic-tank-repair/ Concrete septic tanks can last for decades without the need for homeowner intervention. Under normal conditions, concrete septic tanks are nearly resilient to harm, although they can be damaged by earthquakes, unknown construction problems, or heavy machinery being driven over them. These things can often cause breaches in the concrete, allowing water to pour into the tank and raw sewage to escape. Because spilling sewage poses a health risk, it’s critical to understand how to tell whether your septic tank is cracked. If a crack is discovered, it should be fixed right away. If you smell sewer gas outside your home or notice damp areas where they shouldn’t be, it’s a sign that sewage is escaping from the tank into the ground and that the tank is fractured.