ARTHUR STL Wastewater Treatment Plant, Ida County, Iowa

ARTHUR STL is a municipal wastewater treatment plant located in Ida County, Iowa, United States. The facility serves a small population of 272 residents, providing essential sanitation services to the rural community. The plant operates with secondary treatment, which is the standard level required by the US Clean Water Act for municipal wastewater facilities. Secondary treatment typically involves biological processes to remove organic matter and suspended solids. The plant has a designed capacity of 151.42 cubic meters per day, matching its current discharge volume. The treated effluent from ARTHUR STL is discharged into local waterways that drain into the Missouri River basin. As part of the Mississippi River watershed, the plant's operations contribute to the overall water quality management of this major river system. The facility is subject to National Pollutant Discharge Elimination System (NPDES) permitting under the Clean Water Act, ensuring compliance with environmental standards.

The plant discharges into local streams that flow into the Missouri River, a major tributary of the Mississippi River. This watershed supports diverse aquatic life and provides habitat for fish species such as catfish and walleye. The plant's secondary treatment helps protect downstream water quality in this agriculturally intensive region of the Midwest.