WASHINGTON CO PWSD 4 HOLIDAY Wastewater Treatment Plant, Washington County, Missouri

WASHINGTON CO PWSD 4 HOLIDAY is a municipal wastewater treatment facility located in Washington County, Missouri, United States. The plant serves a small population of 259 residents, reflecting its role in a rural or suburban community. It operates under the regulatory framework of the US Clean Water Act, which requires secondary treatment for municipal wastewater discharges. The plant employs secondary treatment processes, which typically involve biological treatment to remove organic matter and suspended solids. With a design capacity of 75.71 million gallons per day and an actual discharge volume of 56.78 million gallons per day, the facility operates below its designed capacity, indicating room for future growth or seasonal variability. The treated effluent is discharged into a local water body, contributing to the watershed of the Meramec River basin, which ultimately flows into the Mississippi River. This region supports diverse aquatic life and is important for local ecosystems and recreational activities.

The plant discharges into a tributary of the Meramec River, which flows into the Mississippi River, a major waterway that drains into the Gulf of Mexico. The surrounding watershed supports diverse aquatic species and is used for recreation and water supply. The plant's secondary treatment helps protect downstream water quality in this ecologically sensitive region.