Water Quality Index (WQI) Calculator
Assess overall surface water quality using a weighted index of dissolved oxygen, pH, BOD, nitrate, and turbidity measurements. Ideal for environmental monitoring and citizen science.
Water Quality Index (WQI)
intermediateCalculate simplified water quality index from key parameters
Formula
WQI = Σ(wi × qi)
How It Works
This simplified WQI calculates sub-indices for each parameter (scored 0-100) and combines them using weighted averages:
DO (20%), pH (15%), BOD (20%), Nitrate (15%), Turbidity (15%)
Quality Categories: Excellent (90-100), Good (70-89), Fair (50-69), Poor (25-49), Very Poor (0-24)
Frequently Asked Questions
What is a good WQI score?
WQI scores range 0-100. Scores above 70 indicate good water quality suitable for most uses. Scores below 50 indicate degraded water quality requiring remediation.
What is BOD?
Biochemical Oxygen Demand (BOD) measures the amount of oxygen consumed by microorganisms decomposing organic matter. Higher BOD indicates more organic pollution.