The City of Corvallis water system is composed of two water treatment plants, eleven booster pumping stations, nine finished water reservoirs and one raw water reservoir. There is also a water system intertie with the City of Philomath that has been used to provide water to Philomath in the past. The intertie has not been activated since Philomath upgraded their water treatment system in the mid 1980s.

The Corvallis water system receives its water supply from two sources. The Taylor Treatment Plant in southeast Corvallis draws water from the Willamette River. The Rock Creek Treatment Plant takes water from the Rock Creek Watershed on the east side of Mary's Peak.

During 1999, 2.94 billion gallons of drinking water were produced by the two facilities. Forty percent came from the Rock Creek Plant and 60 percent came from the Taylor Plant. The Rock Creek Plant produced about 3 million gallons of water each day, while the Taylor Plant's production varied between 2 to 16 million gallons a day, depending on the time of year and customer demand.