This Department manages and maintains the sanitary and storm sewer systems for the city.
Wastewater Collection System
The existing sewage system in Marshall contains approximately 134,490 feet of gravity sewer, 20,370 feet of sanitary sewer force main, 8,820 feet of combined sewer force main, 10 lift stations and an aerated lagoon wastewater treatment plant.
Wastewater Treatment Facilities
In 1990, the current wastewater treatment plant was constructed to replace the 1940 East Side Trickling Filter Plant and the 1967 West Side Activated Sludge Plant. The wastewater flow from the Old West Side Plant is pumped via force main to Holly Lane pump station, then that flow along with the West half of Marshall’s gravity flow is pumped through an 18″ diameter force main and discharged into a 44″ diameter interceptor sewer line which also collects the East half of Marshall’s gravity flow and flows to the inlet structure pump station of the plant which is located at the East edge of town.
The wastewater plant covers a pond area of 5.3 acres and of 0.45 MGD (million gallons per day). The Daily Maximum Flow of the plant is 1.35 MGD. The treatment process includes mechanical bar screening, a primary aerated treatment lagoon and a secondary aerated treatment lagoon with a rock filter prior to the outfall structure.
Wastewater Department Duties
The wastewater and storm water collection system and treatment plant are operated and maintained by the Wastewater Department. This department has one full time employee. Additional part time employees are used during the summer months. The department maintains, repairs and cleans the storm and sanitary system main lines (not service lines), inlets and manholes, and maintains all pump station facilities. Additional important tasks the department takes care of are providing utility locates under the J.U.L.I.E. one call system along with mowing and maintaining city owned property.