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Regional Water Treatment Plant


Longview's Regional Water Treatment Plant operates the water supply system that delivers high quality drinking water to more than 45,000 people in the Longview area. The primary water source is the Cowlitz River. By maintaining strict monitoring standards, Longview delivers high quality, safe, drinking water to our consumers.

The Water Treatment Facility operates 365 days a year. The City has 12 reservoirs. Our average daily water plant production is 6.5 million gallons, and our peak daily production is 15.75 million gallons.

Important Links
  • Utility Projects
  • Mint Farm Groundwater Project
  • Water Conservation
  • 2009 Water Quality Report
  • 2008 Water Quality Report
  • 2007 Water Quality Report
  • 2006 Water Quality Report
  • 2005 Water Quality Report
  • 2004 Water Quality Report
  • 2002 Water Quality Report
  • US EPA - Safe Drinking Water Act
  • Federal Center for Disease Control (CDC)
  • Washington State Department of Health
  • Washington State Department of Ecology
  • AWWA (American Water Works Association)
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