Grand River WWTP - Secondary Treatment Plant in Grand River, Iowa

Grand River WWTP is a municipal wastewater treatment plant located in Grand River, Decatur County, Iowa. The facility serves a small population of 171 residents, reflecting the rural character of the area. The plant is situated along County Road J20 and provides essential sanitation services to the local community. The plant employs secondary treatment, which is the standard level required by the US Clean Water Act for municipal wastewater facilities. With a designed capacity of 75.71 thousand cubic meters per year and a discharge volume matching that figure, the plant operates at full capacity. As a small facility, it is subject to state-level NPDES permitting under the authority of the Iowa Department of Natural Resources. The treated effluent from Grand River WWTP is discharged into local waterways that ultimately drain into the Mississippi River basin. The plant plays a key role in protecting water quality in the region, particularly for downstream aquatic habitats and recreational uses. Its secondary treatment process ensures compliance with federal and state standards for biochemical oxygen demand and total suspended solids.

The plant discharges into tributaries of the Grand River, which flows into the Missouri River and eventually the Mississippi River. This watershed supports diverse aquatic life and is important for regional agriculture and recreation. The secondary treatment process helps reduce nutrient loading and protect downstream water quality in the Mississippi River basin.