Learning how to repair the septic tank is a good skill to have in an emergency. Many a times, you will find a problem in the pipe system of the tank or in the lid. The best part is both can be repaired. The biggest problem that always occurs with the septic tank pipe is that it always gets clogged.tep 4: Check Septic Tank Lid. Septic tank lids are made of concrete and will crack after years of weathering and moisture. Septic tank lids are very expensive to replace. If you find a leak here, then please repairing it is the least expensive solution.