The little worms you find in your septic tank are actually fly larvae commonly known as drain worms. These larvae eventually develop into sewer flies, drain flies, filter flies, or sink flies. The adult flies lay eggs, and within 32 to 48 hours, these eggs hatch into larvae. These larvae feed on the organic matter present in the septic tank, contributing to its decomposition process. The life cycle of drain worms is relatively short. They go through various stages of development, including egg, larva, pupa, and adult fly, within a matter of weeks. Their presence in the septic tank is typically an indication of an organic buildup or stagnant water, as they are attracted to these conditions. To control drain worms, it is important to address the underlying issues causing their presence, such as eliminating excess organic matter or improving septic tank maintenance. Regular pumping and proper septic system care can help minimize their occurrence and maintain a healthy septic environment.