Some homeowners may wish to measure sludge depth and scum thickness themselves, using a homemade probe. Guidelines for performing this messy operation may be obtained from your local sanitarian in the county health office. Many products which claim to improve septic tank performance or reduce the need for routine pumping are available. These solvents, yeasts, bacteria, and enzymes have not been found to make a significant difference. Some can even cause solids to be carried into the drainfield, causing early clogging and repair.
Some products contain organic solvents which contribute to groundwater pollution.
If you do not know where your septic tank is located, you can find it by gently tapping a steel rod into the ground starting about 10 feet from the point where the sanitary drain leaves the house. Another method is to wait for a light snowfall. The snow is likely to melt first directly over the septic tank. The drainfield receives septic tank effluent. Wastewater trickles out of the pipes, through the gravel layer, and into the soil.