One of the most important things you can do to keep the system functioning properly is to have the septic tank pumped regularly. This will clog the drainfield and not allow wastewater to be treated. Wastewater may form a pond in the yard or back up into the house. At this point, the owner is probably facing costly repairs or replacement, instead of minimal maintenance expenses. Several factors determine tank-pumping frequency including the number of people living in the home, water usage, and whether a garbage disposal is used.
Many experts recommend pumping a tank every two to three years.
Depending on the factors listed above, a tank may need to be pumped more or less frequently. A safe approach is to have the tank inspected annually until it is determined that pumping is required. Once the pumping interval is established, use that until there is a change in water use patterns. Additional people living in the home, children becoming teenagers, the installation of a garbage disposal, or the addition of a whirlpool tub could all increase water usage and wastewater generation. Conversely, fewer people living in the home could decrease water use and wastewater generation.