On July 25, 2016, the Portland Water Bureau began blending a small portion of water from the Columbia South Shore Well Field with water from the Bull Run Watershed as an annual maintenance operation.
|By the Numbers|
The Water Bureau conducts a groundwater maintenance run every year. The city’s groundwater supply is a complex system composed of electric pumps, chemical feed systems, electronic controls and other equipment that must be operated regularly to identify maintenance needs. By doing this operation routinely, we ensure the reliability of the system when we need it, either in an emergency or to meet seasonal supply demands.
The average contribution of groundwater to the system is approximately 15 percent of the total daily water demand. During this run, 278 million gallons of groundwater was blended with water from the Bull Run Watershed.
The groundwater maintenance run ended August 10, 2016. Due to the low percentage of groundwater being blended with the Bull Run Source, there was not a large change in water chemistry.
Learn more at www.portlandoregon.gov/water/groundwater.