Dissolved Oxygen
The amount of oxygen gas dissolved in water, important for aquatic life and an indicator of water quality.
Dissolved oxygen (DO) measures how much oxygen gas is present in water. It enters water from the atmosphere and from aquatic plants through photosynthesis.
Why it matters
There is no ADWG guideline for dissolved oxygen in drinking water, but it is an important environmental and treatment indicator:
- Low DO in source water can release iron and manganese from sediments, affecting water quality
- Adequate DO helps maintain biological processes in treatment plants
- In distribution systems, low DO can promote corrosion of metal pipes
Typical values for well-aerated drinking water are 6–10 mg/L.
Related Terms
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Disclaimer: Glossary definitions are provided for general educational purposes only and do not constitute medical advice or professional guidance. For specific health concerns about your drinking water, consult a qualified health professional. See our Terms of Use.