DC Water and Sewer Authority

What We Do

• Projects & Initiatives
• Drinking Water
  • Drinking Water Quality FAQs
  • Water Terms Glossary
  • Drinking Water Quality at Home
  • Water Quality Test Results
    • Annual Water Quality Reports
    • 2008 Water Quality Report (PDF)
    • Chlorine Content Report
    • Disinfectant Byproducts Report
    • Coliform Content Report
    • Lead and Copper Content
    • Perchlorate (PDF)
    • PH/Phosphate Report
  • Lead Pipes
  • Pharmaceuticals
• Wastewater Treatment
• Fire Hydrants

Lead and Copper Content

Since August 2004, DCWASA has undergone corrosion control treatment to improve the quality of the drinking water. The graphs below show the lead and copper concentrations reported to EPA for the past two years. The EPA limits for lead and copper are based on the 90th percentile of all samples collected during the sampling period. DCWASA collects over 100 samples from customer homes each 6-month monitoring period.

Lead concentration in drinking water July 2006 - December 2008.

copper concentration in drinking water July 2006 - December 2008.