Question raised in Lok Sabha on Contamination of Water, 07/02/2017. Central Ground Water Board (CGWB) carries out groundwater quality assessment and monitoring across the country. Based on such assessment, locations in excess of permissible limits, as prescribed by Bureau of Indian Standards, have been identified which are given in the annexure.

The overall deteriorating water situation in Noida both in terms of quantity and quality highlights the need for immediate interventions by way of using local water resources.

Ground Water Year Book is based on the information generated by monitoring of ground water observation wells of NCT-Delhi during the field Season of 2015-16. The water requirement in National Capital Territory of Delhi is increasing at a rapid pace mainly due to ever increasing population and its associated demands.

Question raised in Lok Sabha on Contamination of Ground Water, 01/12/2016. Ground water quality data generated by Central Ground Water Board (CGWB) during various scientific studies and ground water quality monitoring indicates that ground water in isolated pockets in parts of various States including Delhi and Bihar is contaminated with Fluoride, Nitrate, Arsenic, etc.The number of Blocks in each State, affected with ground water contamination are given at Annexure-I.

The Water Policy of NCT Delhi consists of a series of policy statements each of which will have to be elaborated into an actionable program by a working group. Components of different statements could converge on a common objective.

A total number of 46 samples were collected from the open wells during post monsoon season in and around the Tuticorin city to evaluate the water quality and scrutinize the hydro chemical characteristics. Quality assessment is done by estimating the pH, electrical conductivity, temperature, major cation (Na+, K+, Mg2+, Ca+ ) and major anions (Cl-, HCO3-, PO4-). The irrigation quality parameters like sodium absorption ratio, %Na, residual sodium carbonate, residual sodium bicarbonate, chlorinity index, permeability index and magnesium hazard were appraised.

Hexavalent chromium [Cr(VI)] is a known pulmonary carcinogen. Recent detection of Cr(VI) in drinking water wells in North Carolina has raised public concern about contamination of drinking water wells by nearby coal ash ponds. Here we report, for the first time, the prevalence of Cr and Cr(VI) in drinking water wells from the Piedmont region of central North Carolina, combined with a geochemical analysis to determine the source of the elevated Cr(VI) levels.

Inorganic soil arsenic (As) in three soils was fractionated adopting phosphorus fractionation schemes. Among these fractions, iron-bound arsenic (Fe-As) was found highest, followed by aluminium-bound arsenic (Al-As). The freely exchangeable arsenic was relatively small compared to the arsenic held by internal surfaces of soil aggregates. The arsenic fractions exhibited positive correlation with phosphorus content presumably due to the fact that high P in soil releases more arsenic from soil adsorption sites owing to the competition for the same adsorption sites.

Many of the world’s megacities depend on groundwater from geologically complex aquifers that are over-exploited and threatened by contamination. Here, using the example of Dhaka, Bangladesh, we illustrate how interactions between aquifer heterogeneity and groundwater exploitation jeopardize groundwater resources regionally. Groundwater pumping in Dhaka has caused large-scale drawdown that extends into outlying areas where arsenic-contaminated shallow groundwater is pervasive and has potential to migrate downward.

The gravest threat to groundwater in India isn’t over-exploitation but arsenic and salt contamination.