Although Bangladesh receives plenty of rainwater during its monsoon, both rural and urban areas suffer from shortages of safe drinking water during dry season. Arsenic contamination of ground water affects many rural areas, whilst some urban areas including the capital, Dhaka City, lack sufficient potable ground water to meet the demand.

Various samples of groundwater were collected from different areas in and around the Punnam village of Karur District, India and analyzed for their physicochemical characteristics. The results of this analysis were compared with the water quality standards of WHO and CPHEEO.

Surface water and groundwater samples of certain locations namely Kallambella, Bugudanahalli, Maidala, Honnudike, Kunigal, Kadaba and Hebbur, situated around Tumkur were assessed in the month of September 2008 for pH, EC and heavy metals Cd, Cu, Fe, Hg, Mn, Zn and Ni. The pH vales of surface waters were in alkaline range of 7.8-8.2 and are well within safe limits for crop production.

Radiogenic isotopes (3H and 14C) and stable isotope (18O) together with TDS, EC and salinity of water were used to discriminate qualitative and quantitative groundwater age, probable recharge time, flow respectively in groundwater of Challaghatta valley, Bangalore.

An investigation was undertaken in 10 villages (28 samples) of

Rainfall is the major source of recharge to groundwater aquifers in Kerala. Most of the rainfall is received during a six months period, leaving the remaining six months between December and January to May as almost dry months. The rainfall amount and distribution pattern in any given year determines the level of groundwater scarcity during summer months.

Uranium content in groundwater varies markedly depending upon geological terrain, climate, proximity of uranium deposits, as well as composition of the water. In India, the average reported range of uranium in groundwater is from 0.01 to 19.6 micrograms/litre (ug/L).