The company charges tariffs for treating the sludge from septic tank truckers. It has the advantage of potentially having the pump closer to the septic tank. Doris interrogates Flash and Gramps before lowering them into a large septic tank. Maps showed that this was the site of the Home's septic tank. The standard system is a tiled leach field combined with a septic tank. As the deputy leaves, he discovers drag marks leading to the septic tank. "The Grass Is Always Greener over the Septic Tank". It can also be connected to a septic tank. Corless believed that some of the skeletons found are inside the septic tank. The Water Environment Regulations 2011 regulate the registration of septic tank systems in Scotland. They eventually find them in a septic tank and rescue and clean them up. The data suggests that septic tank effluent is a probable source of PPCPs. The slab was believed by some to have covered the former Home's septic tank. A septic drain field, a septic tank, and associated piping compose a septic system. Septic tank systems are a type of simple onsite sewage facility (OSSF).