Grandfield WWT Wastewater Treatment Plant, Grandfield, Oklahoma

Grandfield WWT is a municipal wastewater treatment facility located in Grandfield, Oklahoma, a small community in Tillman County. The plant serves a population of approximately 1,110 residents, reflecting its role as a key infrastructure component for the local area. The facility provides secondary treatment, which is the standard level required by the US Clean Water Act for municipal wastewater plants. With a designed capacity of 681.37 million gallons per year and an annual discharge volume of 416.40 million gallons, the plant operates at a utilization rate that suggests adequate capacity for current demand. As a US facility, it is subject to National Pollutant Discharge Elimination System (NPDES) permitting, which sets effluent limits to protect water quality. The treated effluent is discharged into local waterways that ultimately drain into the Red River basin, a major tributary of the Mississippi River. This downstream connection underscores the plant's role in protecting water quality in the broader watershed, supporting aquatic life and downstream communities.

The plant discharges into local streams that flow into the Red River, which forms part of the border between Texas and Oklahoma and eventually joins the Mississippi River. The Red River basin supports diverse aquatic habitats and is important for regional biodiversity. The plant's secondary treatment helps reduce nutrient and pollutant loads, mitigating impacts on downstream water bodies and ecosystems.