What does the water quality index (WQI) measure?

The water quality index (WQI) is a comprehensive tool that evaluates the overall health of a water body by taking into account multiple water quality parameters. It combines various measurements, such as levels of dissolved oxygen, pH, turbidity, nutrients, and the presence of harmful microorganisms or pollutants, to produce a single value. This allows for an easier interpretation of complex water quality data, making it accessible and understandable to the public and decision-makers alike.

By summarizing the overall conditions of a water source into a single index, the WQI helps assess the ecological health of the water body, provide insights into pollution levels, and track changes over time. It is essential for monitoring and managing water resources, as it reflects the cumulative effects of different factors on water quality rather than just isolating individual parameters or conditions.