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Persigo Treatment Plant

2145 River Road
Grand Junction, CO 18505
Main Office: 970-256-4180
Fax: 970-245-8620

Photo by Steve Traudt

Wastewater Quality Laboratory


The Wastewater Quality Laboratory is located at the Persigo Wastewater Treatment Plant facility.  The Wastewater Quality Laboratory is managed independently from the Persigo Plant management system.  This ensures that the Persigo Wastewater Treatment Plant discharges effluent (treated) water that is in compliance with state and federal regulations, which is the number one goal of the Environmental Lab. This goal is achieved through an intense quality control program that requires a well-equipped and highly trained staff of laboratory professionals.

In addition to monitoring the wastewater discharge, the Laboratory also analyzes samples for the City's Industrial Pretreatment Program and process control samples for wastewater operations.  Last year, this laboratory performed over 45,000 laboratory tests.

Discharge Monitoring

The U.S. Environmental Protection Agency (EPA) and the Colorado Department of Public Health establishes discharge limits and monitoring requirements for municipal wastewater treatment facilities. These limits determine the amount of contaminants allowed to be present in a facility's effluent (water discharged after sewage treatment). The limits are set to protect the current uses of the Colorado River - recreation, aquatic life and agriculture.

The Wastewater Quality Laboratory acts as an independent department and monitors the treated water for these limits. Currently, limits exist for such analyses as Biochemical Oxygen Demand (BOD5), solids (TSS), ammonia, pH, dissolved oxygen, metals, E. coli,  and oil & grease.

Wastewater Process Control

The Wastewater Quality Laboratory acts as support for the Wastewater Operations Division by providing analyses of process control samples. By analyzing samples from different points in the sewage treatment process, the laboratory provides information that operators use to enhance the treatment process.

If you would like more information about the Wastewater Quality Laboratory, email Jo Holcomb, Laboratory Manager, or call (970) 256-4174.