NEWHALL WWTP, Benton County, Iowa - Secondary Treatment Plant

NEWHALL WWTP is a municipal wastewater treatment facility located in Benton County, Iowa, United States. It serves a small population of 854 residents, reflecting its role in a rural or small-town setting within the state's wastewater infrastructure. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal facilities. With a designed capacity of 340.69 megaliters and an annual discharge volume of 189.27 megaliters, the plant operates below its capacity, indicating room for future growth or seasonal variations in flow. The treated effluent is discharged into a local water body, contributing to the watershed of the Iowa River basin, which ultimately flows into the Mississippi River. This discharge supports downstream aquatic ecosystems and must comply with National Pollutant Discharge Elimination System (NPDES) permits to protect water quality.

The plant's discharge enters a tributary of the Iowa River, which flows southeast to join the Mississippi River. The Mississippi River is a major ecological corridor supporting diverse fish and migratory bird species. The plant's secondary treatment helps reduce organic pollutants and suspended solids, protecting the local stream health and downstream water quality in the Mississippi River basin.