Ground water quality  
Technology Urban

The quality of ground water is alkaline with pH ranging from 7.1 to 9.2, chloride content ranges between 21 and 1380 ppm. South of Delhi average chloride content is 250 ppm while in Najafgarh area it is around 1000 ppm rendering the water saline covering the area of 32 km. Sq. and marginally saline over the area of 129 sq km.


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The ground water study done by the NEERI for MoEF revealed high nitrate and fluoride concentrations. High metallic content, particularly manganese and iron have also been observed in the samples collected. The manganese content was found to be 0.1 mg/L against the permissible limit of 0.5-mg/L and iron concentration of 4.05 mg/L to 0.337 mg/L have been observed.

Chemical Quality of Ground Water in South West district

Ground water in maximum part of the South district is fresh and potable with electrical conductivity ranging from 320 to 4130 micro-mhos/cm at 25` C. Electrical conductivity values more than the permissible limit are observed at Deragaon, Molarbund and at Gadaipur. High values of nitrate are found at four locations i.e. at Gadaipur, at Rajokri and at Jaunapur. In north Ghitorni and Andheri More, Fluoride is more than permissible limits. Except chromium concentrations at one locality, ground water is devoid of pollution by heavy metals. A comparision of ground water quality from 1983 to 2000 shows quality deterioration in the central part of the Chhattarpur basin and in the areas around Nizamuddin. In central part of the Chattarpur basin, quality deterioration is mainly because of over-development of ground water resources. The exhaustion of fresh water present at shallow depths is resulting into brackish water pumping from the tubewells that are tapping the deeper aquifers of alluvium.

The electrical conductivity of shallow ground water in the Southwest district varies from 630 to 13200 micro-mhos/cm at 25` C. Detailed Electrical Conductivity map prepared for this district, ground water quality is fresh with electrical conductivity 1000 to 2000 micro-mhos/cm at 25` C. Thus, with over-development of ground water resources in the district, more and more areas are becoming brackish.

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