District of Columbia Water and Sewer Authority

DC Water is committed to providing customers with the highest-quality drinking water by first ensuring that the water we deliver to you meets or surpasses federal Safe Drinking Water Act standards, and secondly, by providing you with the most reliable service possible.

Water is treated at the Washington Aqueduct treatment plants. We collect water samples continuously to ensure that the water leaving the plant meets EPA standards. In addition, DC Water collects tap water samples throughout Washington, D.C., on a daily basis and analyzes the samples immediately on site and at our distribution laboratory.

If you have any questions about the quality of your drinking water, please call our Water Quality Department at 202-612-3440.

What can you find in this section?

• About Drinking Water Quality
  Find out how DC Water ensures the safety of drinking water in Washington, D.C.
• Drinking Water Quality FAQs
  Frequently asked questions regarding water quality
• Water Quality Test Results
  Information Regarding Water Quality in the District of Columbia
• Water Quality in Your Home
  How to improve water quality in the home
• Water Quality in Commercial Buildings
• Lead
  Resources on lead pipes including maps, publications, links, and replacement schedule.
• Drink Tap
  Information on tap water versus bottled water.
• Life Cycle of a water main break
  Life Cycle of a Water Main Break