Westminster Big Dry Creek WWTF - Colorado Wastewater Treatment Plant

Westminster Big Dry Creek WWTF is a municipal wastewater treatment facility located in Westminster, Colorado, serving a population of around 79,779. The plant is situated along Big Dry Creek Trail in Adams County and plays a key role in managing wastewater for this growing suburban community within the Denver metropolitan area. As a US facility serving a medium-to-large agglomeration, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting requirements. For plants of this scale, secondary treatment is the minimum standard, with potential for additional nutrient removal to protect downstream water quality. The treated effluent is discharged into Big Dry Creek, which flows into the South Platte River, a major tributary of the Platte River that ultimately drains into the Missouri River and Mississippi River system. This watershed supports diverse aquatic life and provides water for irrigation and recreation in the semi-arid Colorado region.

The plant discharges into Big Dry Creek, a tributary of the South Platte River, which flows through the Denver metropolitan area before joining the Platte River in Nebraska. The South Platte River is a critical water source for agriculture and urban use in the region, and its ecological health is important for fish populations including trout species. Downstream, the river system connects to the Missouri and Mississippi Rivers, impacting a vast watershed.