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Utilities Department > Wastewater Treatment Plant

Wastewater Treatment Plant

Wastewater Treatment Plant

The Oak Grove Wastewater Treatment Plant was placed in service in 1961. This wastewater collection and treatment facility provides service for a 00-square-mile service area in Ennis.   

The treatment plant was developed on a 15-acre tract of land with an initial treatment capacity of 3.1 million gallons on an annual average.  

In its current configuration, the facility has three primary clarifiers with four aeration basins, three secondary clarifiers and two chlorine disinfection chambers.



   Wastewater Treatment Facility