Physico-chemical and elemental studies of four ground water (bore wells) samples from different parts of Delhi was carried out during the month of April-May. The water quality parameters like pH, Total dissolved solids (TDS), Total alkalinity (TA), Total hardness (TH), Chloride (Cl-), Sulphate (SO42), Nitrate (NO3-), Fluoride (F-), Calcium (Ca2+), Magnesium (Mg2+), Aluminium (Al), Boron (B), Zinc (Zn), Selenium (Se), Manganese (Mn), Iron (Fe), Chromium (Cr), Copper (Cu), Lead (Pb), Cadmium (Cd), Arsenic (As) and Mercury (Hg) were studied and out come of the results were discussed. The elemental analysis was carried out by usage of ICPMS. Different parameters were examined & compared with Indian Standards, BIS 10500 (Maximum Permissible Value) to determine their suitability for drinking purposes.