With the $20 million expansion, the plant's processing capacity doubles from 10 million gallons per day to 20 million gallons per day.
Mayor Robin Elackatt said the expansion is Missouri City's largest capital improvement project in city history.
"This continued expansion of the city's public surface water drinking supply is critical to accommodate growth in our city as well as to meet the time-sensitive mandates from the Fort Bend Subsidence District," Elackatt said.
The Fort Bend Subsidence District requires cities to convert 60% of their total water demand to alternative, or nongroundwater, supplies by 2025. Elackatt said the city has currently reduced groundwater pumping by 42%.
A future Phase 3 expansion will further increase the plant's capacity to 33 million gallons of drinking water per day.