Walker W W Lagoon Wastewater Treatment Plant, Walker, Iowa

Walker W W Lagoon is a municipal wastewater treatment facility located at 5734 Bettys Grove Road in Walker, Iowa, a small community in Linn County. The plant serves a population of 673 and is designed to handle a capacity of 340.69 megaliters, with an annual discharge volume of 227.13 megaliters. The plant provides secondary treatment, which is the standard level required by the US Clean Water Act for municipal wastewater facilities. Under the National Pollutant Discharge Elimination System (NPDES), permits are issued by the Iowa Department of Natural Resources to regulate discharges and ensure compliance with water quality standards. The treated effluent is discharged into local waterways that are part of the Mississippi River basin. The plant's inland location, over 50 km from the coast, means its discharge primarily affects freshwater ecosystems and contributes to the overall water quality of the region's rivers and streams.

The plant discharges into the Cedar River watershed, which flows into the Iowa River and eventually the Mississippi River. This basin supports diverse aquatic life and is used for recreation and drinking water downstream. The secondary treatment process reduces organic pollutants and suspended solids, protecting the local stream ecology from nutrient enrichment and oxygen depletion.