DEWAR SD STL Wastewater Treatment Plant, Dewar, Iowa

DEWAR SD STL is a municipal wastewater treatment facility located on East Donald Street in Dewar, Iowa, within Black Hawk County. The plant serves a small population of 150 residents, reflecting its role as a local-scale treatment system for this rural community in the Midwestern United States. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal wastewater facilities. With a designed capacity of 113.56 m³/day and an average daily discharge of 75.71 m³/day, the plant operates below its design capacity, indicating adequate headroom for current demand. As a small facility, it is likely subject to state-level NPDES permitting administered by the Iowa Department of Natural Resources. The treated effluent is discharged into a local water body, ultimately contributing to the Cedar River watershed, which flows into the Iowa River and then the Mississippi River. This downstream connection to the Mississippi River system underscores the plant's role in protecting water quality across a broad regional drainage basin that supports diverse aquatic life and recreational uses.

The plant discharges into a local stream that drains into the Cedar River basin, part of the larger Mississippi River watershed. This region supports diverse aquatic species and provides important habitat for migratory birds. The Cedar River flows through agricultural and urban areas before joining the Iowa River, which ultimately reaches the Mississippi River, a major ecological corridor in North America.