Rancho Viejo WWTP | Secondary Treatment Plant in Rancho Viejo, Texas

Rancho Viejo WWTP is a municipal wastewater treatment facility located in Rancho Viejo, Texas, within Cameron County. The plant serves a population of 1,185 and operates under secondary treatment standards, which is the minimum required by the US Clean Water Act for municipal wastewater. The plant's designed capacity is 1,514.16 million gallons per year, with an actual discharge volume of 719.23 million gallons per year. As a secondary treatment plant, Rancho Viejo WWTP uses biological processes to remove organic matter and suspended solids. The plant is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Texas Commission on Environmental Quality (TCEQ), which set effluent limits to protect water quality. The plant's capacity utilization suggests it operates well within its design capacity. The treated effluent from Rancho Viejo WWTP is discharged into local waterways that ultimately drain into the Rio Grande and then the Gulf of Mexico. The plant plays a key role in protecting the downstream environment, including sensitive coastal ecosystems in the Lower Rio Grande Valley. Proper treatment helps reduce nutrient loading and pathogen risks to the Gulf's marine habitats.

The plant discharges into the Rio Grande basin, which flows into the Gulf of Mexico. The Lower Rio Grande Valley is an ecologically sensitive region supporting diverse aquatic life and migratory bird species. The Gulf of Mexico receives nutrient inputs from agricultural and urban runoff, making effective wastewater treatment critical to preventing eutrophication and harmful algal blooms in coastal waters.