##National Sanitation Foundation **Parameters:** Temperature, pH, Dissolved Oxygen, Turbidity, Fecal Coliform, Biochemical Oxygen, Total Phosphates, Nitrates, Total Suspended Solids **Links:** - [Calculator](http://www.water-research.net/index.php/water-treatment/water-monitoring/monitoring-the-quality-of-surfacewaters): Here you can input data about any number of parameters and have a WQI result level. The page have charts relating the water quality value derived with the level of each parameter. - [National Sanitation Foundation Water Quality](http://bcn.boulder.co.us/basin/watershed/wqi_nsf.html): Explains the index. ##UNEP **Parameters:** Dissolved Oxygen, pH, Conductivity, Nitrogen, Phosphorus **Links:** - [Water Quality Index and Indicators](http://www.unep.org/gemswater/AssessmentsandIndicators/WaterQualityIndexandIndicators/tabid/101094/): explains the calculation - [Water Quality: Development of an index to assess country performance](http://www.unep.org/gemswater/Portals/24154/pdfs/new/2008%20WQ%20Index%20development%20White%20Paper.pdf)