What is water quality index PDF?

The index takes into. account nine water quality parameters: Dissolved oxygen, Faecal coliform, pH, BOD, Temperature difference (1 mile), Total phosphate, Nitrate, Turbidity and Total solids. Water is graded for its quality from the worst to best on a scale of 0 to 100. The quality of.

What is water quality index?

Water quality index (WQI) provides a single number that expresses the overall water quality, at a certain location and time, based on several water quality parameters. The objective of WQI is to turn complex water quality data into information that is understandable and usable by the public.

How is water quality index calculated?

WQI = ∑ SIi (4) SIi is the subindex of ith parameter; qi is the rating based on concentration of ith parameter and n is the number of parameters. The computed WQI values are classified into five types, “excellent water” to “water, unsuitable for drinking”.

Who published water quality index?

As the principal United Nations body on environment, the UN Environment Programme (UNEP) had been tasked by UN-Water to lead on freshwater quality and aquatic ecosystem data and information inputs to the World Water Assessment Programme, and the main WWAP output, the World Water Development Report series.

What is the rank of India in water?

India Ranks-120th-of-122-countries-in-a-global-water-quality-index.

What is acceptable iron level in drinking water?

0.3 mg/l
Health and Water Quality Under Department of Natural Resources (DNR) rules, iron is considered a secondary or “aesthetic” contaminant. The present recommended limit for iron in water, 0.3 mg/l (ppm), is based on taste and appearance rather than on any detrimental health effect.

What is the best water quality?

1) Switzerland. Switzerland is repeatedly recognized as a country with the best quality tap water in the world. The country has strict water treatment standards and superior natural resources with an average rainfall per year of 60.5 inches. In fact, 80% of the drinking water comes from natural springs and groundwater.

What is the best water quality index?

The WQI values ranges between 0 which represents a worst water quality and 100, the best water quality.

What is the rank of India in water quality index?

120th among
Globally, India is ranked 120th among 122 countries in WaterAid’s water quality index.

Where is the purest water in India?

The Umngot river in Meghalaya is the cleanest in the country, the Ministry of Jal Shakti said in a tweet. Popularly known as Dawki river, river Umngot is 100 kilometre from Shillong in Meghalaya. “It seems as if the boat is in the air; water is so clean and transparent.

Which state has the purest water in India?

The rank is based on the percentage of households which have access to safe drinking water. Punjab ranked highest with 97.6%, while Kerala has the worst rank with only 33.5% households having access to safe drinking water.