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Wastewater Collection System
Wastewater discharged from a home or business enters the sewer system through service lines eight inches in diameter or smaller. These service lines carry the flow of wastewater to the city’s trunk lines, consisting of pipes eight inches or larger. Based on the topography of the city, if the flow is not by gravity, there are lift stations to pump the wastewater from the trunk sewers into the main NTMWD interceptor sewers. The wastewater flows by gravity through these large interceptor sewers, which are up to 60 inches diameter, to the NTMWD treatment plant.

Sewer Lift Stations
Lift stations are an integral part of the collection and conveyance system. Collection systems are built to utilize the natural flow of gravity when possible. When wastewater cannot travel through the lines by gravity, pumps are used to force the wastewater through the force mains until it can again be transported by gravity flow. The City of Allen has six lift stations strategically located based on the topography of the area.

water sewer line