Maynard WWTP, Fayette County, Iowa - Secondary Treatment Plant

Maynard WWTP is a municipal wastewater treatment plant located in Fayette County, Iowa, serving a small community of 518 residents. The plant provides secondary treatment, a standard level for small agglomerations in the United States. With a designed capacity of 306.62 million gallons per year and an actual discharge volume of 367.19 million gallons per year, the plant operates at a utilization rate exceeding its design capacity. As a US facility, it is regulated under the Clean Water Act and requires an NPDES permit issued by the Iowa Department of Natural Resources. The plant discharges treated effluent into local waterways that ultimately drain into the Mississippi River basin. Its operations help protect downstream water quality in the region's agricultural landscape.

The plant discharges into tributaries of the Upper Mississippi River basin, which flows into the Gulf of Mexico. The region is predominantly agricultural, and the plant's secondary treatment helps reduce nutrient loads that could contribute to hypoxia in the Gulf. The local watershed supports diverse aquatic life and is part of a critical migratory corridor for waterfowl.