Water Quality Reports

We’re committed to providing residents with a safe and reliable supply of high-quality drinking water. We test water using sophisticated equipment and advanced procedures. The Water, Sewer, Streets Bureau meets state and federal standards for water quality. The annual “Consumer Confidence Report,” required by the Safe Drinking Water Act from the Environmental Protection Agency, tells you where your water comes from, what our tests show about it and other things you should know about drinking water.

Information about Poly- and Perfluoroalkyl Substances (PFAS)

Willston Pressure Zone

Arlington County purchases water for the Willston Pressure Zone from Fairfax Water which gets its water from the Washington Aqueduct Division of the Army Corps of Engineers. This zone is considered a consecutive water system that requires its own sampling and monitoring. If you live within the Willston Pressure Zone, please reference the Willston Water Quality Reports below.

To obtain a printed report or for questions about your drinking water, call 703-228-6555 

2024 Average Arlington Compounds Levels

• Hardness: 8 grains/gal or 129 mg/L
• pH: 7.5
• Chloramine Residual: 2 mg/L
• Fluoride: 0.7 ppm
• Sodium: 21 ppm
• Nickel: 0.9 ppb
• Calcium: 38 mg/L
• Chloride: 29 mg/L
• Magnesium: 8 mg/L
• Sulfate: 44 mg/L

Note to Property Managers of Multifamily Homes: Please post this report in a public area of any building managed in Arlington County. If additional copies are needed, call 703-228-6555 or email us.