Castle Rock WWTP, Castle Rock

Overview

Castle Rock WWTP serves 2,130 people in Castle Rock, Washington. The plant operates under the US Clean Water Act, with NPDES permits regulating its discharge.

Castle Rock WWTP is a municipal wastewater treatment facility located in Castle Rock, Washington, serving a population of approximately 2,130 residents. The plant is situated in Cowlitz County, near the Cowlitz River, and plays a key role in managing local wastewater for this small community. As a US facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Washington State Department of Ecology. The treated effluent from Castle Rock WWTP likely discharges into the Cowlitz River, which flows into the Columbia River and eventually reaches the Pacific Ocean. This watershed supports diverse aquatic life, including salmon runs, and the plant's discharge must comply with state water quality standards to protect downstream ecosystems.

Environmental context

The plant's receiving water body is likely the Cowlitz River, a tributary of the Columbia River, which drains into the Pacific Ocean. This watershed supports critical salmon and steelhead habitats, making water quality management essential for maintaining aquatic biodiversity and downstream ecological health.

Frequently asked questions

Castle Rock WWTP is located at 197 Cummings Street Southwest, Castle Rock, Washington, in Cowlitz County, United States.

Castle Rock WWTP serves approximately 2,130 residents in the Castle Rock area.

The plant discharges into the Cowlitz River, which flows into the Columbia River and then to the Pacific Ocean, helping protect these water bodies from untreated wastewater.

As a US facility, Castle Rock WWTP operates under the Clean Water Act and must comply with NPDES permits issued by the Washington State Department of Ecology, which set limits on pollutants to protect water quality.

For small communities like Castle Rock, secondary treatment is typically required under the Clean Water Act, which involves biological processes to remove organic matter and suspended solids before discharge.