An Extended Aeration Treatment System is a biological wastewater treatment process that utilizes an altered Activated Sludge Process, and is typically used to process smaller amounts of wastewater as it only requires a single aeration tank. In this process, oxygen is disbursed into wastewater that is held in a single open aeration tank. Aeration encourages the microorganisms present within the treatment system to grow, multiply, consume, and digest the dissolved organic pollutants within the wastewater. Because this is a single tank system, “aged sludge” is present. This system requires a lengthier mixing period than the conventional activated sludge process. The extended mixing time combined with the presence of aged sludge creates a microbiological ecosystem that is stable and better suited to treat fluctuating waste loads for locations where occupancy levels vary.