Harmony Hills WWTP - Holloway, Louisiana Secondary Treatment Plant

Harmony Hills WWTP is a municipal wastewater treatment plant located in Holloway, Rapides Parish, Louisiana, United States. The facility serves a small population of about 248 residents, reflecting its role in a rural or suburban community. As a secondary treatment plant, it provides biological treatment to reduce organic matter and suspended solids before discharge. The plant operates under the regulatory framework of the US Clean Water Act, administered through the National Pollutant Discharge Elimination System (NPDES) permit program. For small-scale facilities like this, permits typically set effluent limits for biochemical oxygen demand (BOD), total suspended solids (TSS), and other parameters to protect water quality. The designed capacity of 151.42 units aligns with the population served, indicating appropriate sizing for the community. The treated effluent is discharged into local waterways that ultimately drain into the Red River basin, a major tributary of the Mississippi River. This watershed supports diverse aquatic life and provides water for agricultural and recreational uses. The plant's secondary treatment helps reduce nutrient loading and organic pollution, contributing to the ecological health of downstream water bodies.

The plant discharges into the Red River basin, which flows southward through Louisiana and joins the Mississippi River near Baton Rouge. This watershed supports a variety of fish and wildlife, including species of freshwater mussels and migratory birds. The Red River eventually empties into the Gulf of Mexico, where nutrient inputs from upstream sources can contribute to hypoxic zones. Secondary treatment at this plant helps mitigate local organic and nutrient pollution.