Hunning Hills STP - Advanced Wastewater Treatment in High Ridge, Missouri

Hunning Hills STP is a municipal wastewater treatment facility located in High Ridge, Jefferson County, Missouri. The plant serves a small population of 159 residents, reflecting its role as a local-scale infrastructure asset in the suburban St. Louis region. The plant provides advanced treatment, which goes beyond the secondary treatment standard required by the US Clean Water Act. With a designed capacity of 41.64 thousand gallons per day and a current discharge volume of 30.28 thousand gallons per day, the facility operates with ample capacity headroom. As a US facility, it operates under an EPA NPDES permit issued by the Missouri Department of Natural Resources, ensuring compliance with federal water quality standards. The treated effluent is discharged into a receiving water body that ultimately drains into the Mississippi River basin. The plant's advanced treatment helps protect downstream aquatic ecosystems and supports the overall water quality of the Meramec River watershed, which is a key tributary of the Mississippi.

The plant discharges into a local stream that flows into the Meramec River, a major tributary of the Mississippi River. The Meramec River supports diverse aquatic life and is an important recreational resource for the region. Advanced treatment at this plant helps minimize nutrient loading and protects downstream water quality in the Mississippi River basin.