Overview
Callahan STP is an advanced wastewater treatment plant serving 1,537 people in Callahan, Florida. It discharges treated water into the local watershed, supporting downstream ecosystems.
Callahan STP is a municipal wastewater treatment facility located in Callahan, Nassau County, Florida, serving a population of approximately 1,537 residents. The plant is situated near Old Dixie Highway and operates as part of the region's water infrastructure. The plant provides advanced treatment, which goes beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 1,135.62 thousand gallons per day and an average discharge volume of 832.79 thousand gallons per day, it operates under the U.S. Clean Water Act, which requires NPDES permits for such discharges. Advanced treatment is typical for plants protecting sensitive water bodies. The treated effluent is discharged into the local watershed, which ultimately drains into the St. Marys River and then the Atlantic Ocean. This area supports diverse aquatic life and is important for regional water quality, especially given its proximity to coastal ecosystems.
Environmental context
The plant's discharge enters the St. Marys River basin, which flows into the Atlantic Ocean near the Florida-Georgia border. This coastal watershed supports estuarine habitats and migratory fish species. The advanced treatment helps minimize nutrient loading, protecting downstream water quality in a region sensitive to algal blooms and marine ecosystem health.
Frequently asked questions
Callahan STP is located on Old Dixie Highway in Callahan, Nassau County, Florida, United States.
The plant serves a population of 1,537 residents in the Callahan area.
The plant discharges treated effluent into the local watershed, which flows into the St. Marys River and ultimately the Atlantic Ocean.
Callahan STP provides advanced treatment, which includes nutrient removal beyond secondary treatment, to meet stringent water quality standards.
As a municipal wastewater plant in the United States, Callahan STP operates under the Clean Water Act, requiring an NPDES permit issued by the Florida Department of Environmental Protection to regulate its discharges.
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