Boulder 75th Street WWTP - Wastewater Treatment in Boulder County, Colorado

Boulder 75th Street WWTP is a municipal wastewater treatment facility located in Boulder County, Colorado, serving a population of around 110,000. The plant is situated in the Front Range urban corridor, an area with a semi-arid climate and growing population. As a large agglomeration serving over 100,000 people, the plant operates under the U. S. Clean Water Act, which requires secondary treatment as a minimum standard. The National Pollutant Discharge Elimination System (NPDES) permit program governs its discharge, with permits issued by the Colorado Department of Public Health and Environment. Advanced treatment may be required to meet water quality standards for sensitive receiving waters. The plant's treated effluent flows into local streams that drain into the South Platte River, a major tributary of the Platte River system. This river network supports diverse aquatic life and provides water for agriculture, recreation, and municipal use downstream. The plant plays a key role in protecting water quality in the South Platte basin.

The plant discharges into the South Platte River watershed, which flows through Colorado, Nebraska, and joins the Platte River before reaching the Missouri River and ultimately the Mississippi River and Gulf of Mexico. The South Platte is a critical water source for the region, supporting fish species such as rainbow trout and brown trout, as well as migratory birds along the Central Flyway. Protecting water quality in this basin is essential for maintaining ecological health and meeting downstream water use needs.