Displaying Ratings
Ratings provide a visual representation of a country’s performance on the indicator.
Legend
Click on a country to see its performance.
SDG achieved
Challenges remain
Significant challenges remain
Major challenges remain
Information unavailable
Description
Biochemical oxygen demand (BOD) is used to measure water quality. It refers to the amount of oxygen required by aerobic microorganisms to decompose organic substances in a water sample over a period of five days in the dark at 20°C (BOD5), measured as milligrams per litre (mg O2/L) and weighted by the number of measuring stations. High values of BOD5 are usually a sign of organic pollution, which affects the water quality.
Long-Term Objective
Science-based/Technical optimum
The long-term objective for this indicator is a value of 1.
Reference
EEA
