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Wastewater Treatment Plant
The City of Mont Belvieu owns, operates, and maintains the Cotton Bayou Wastewater Treatment Plant located on Perry Avenue. The plant was opened in 1980 and was expanded in 1998 to its current capacity. The capacity of the plant is 1.5 million gallons per day average on a monthly basis. The peak capacity is 4.5 million gallons per day which is the maximum on any given day.

Wastewater Collection System
The City of Mont Belvieu owns, operates, and maintains 19 sewer lift stations. The lift stations are located in all parts of the city. The collection system also includes several miles of sanitary sewer collection lines and sewer force mains. These lines range in size from 4 inch to 48 inch.