Arpin WWTP - Secondary Treatment Facility in Town of Arpin, Wisconsin

Arpin WWTP is a municipal wastewater treatment facility located in the Town of Arpin, Wood County, Wisconsin. The plant serves a small population of 354 residents, reflecting its role in a rural community. It is situated inland, far from coastal waters, and its operations are governed by state and federal environmental standards. The plant provides secondary treatment, a standard level required by the US Clean Water Act for most municipal facilities. With a designed capacity of 211.98 megaliters and an annual discharge volume of 113.56 megaliters, the plant operates below its capacity, indicating adequate headroom for current demand. As a small facility, it is subject to EPA NPDES permitting, which sets effluent limits to protect water quality. The treated effluent is discharged into local waterways that drain into the Wisconsin River basin, eventually reaching the Mississippi River and the Gulf of Mexico. The plant's location in a rural, agricultural region means its discharge supports local stream health and downstream ecosystems, including the Upper Mississippi River watershed.

The plant discharges into tributaries of the Wisconsin River, which flows into the Mississippi River and ultimately the Gulf of Mexico. The local watershed supports diverse aquatic life and is part of a larger migratory corridor for birds and fish. The plant's secondary treatment helps reduce nutrient loads, protecting downstream water quality in this ecologically sensitive region.