Abstract: Presence of high concentration of toxic elements in drinking water causes serious health problems. Ground and Rain water is the prime sources of drinking water in the almost areas of Churu district. Ground water in areas of Rajgarh tehsil in churu district is contaminated with high concentration of chloride, fluoride, arsenic, nitrate, etc natural elements. These elements play important role in health care. Fluorosis is a main health issue occurs due to use of fluoride contaminated ground water. The high concentration (>1.5-3mg/l) of fluoride ion in drinking water mainly effect on bone and teeth problems. Nitrate derived from oxidation of nitrogen is also cause of pollution in ground wate. Nitrate can undergo endogenous reduction to nitrite and nitrosation of nitrites can form N-nitroso compounds that are potent carcinogens and affect the health of people in the area. Excess concentration of nitrites causes diarrhea and blue baby syndrome in children. The aim of the present study is to understand the contamination level of, fluoride, chloride and nitrate, alkalinity, hardness and TDS of drinking water and their effects in people of Rajgarh tehsil. A total 28 samples of ground water were collected from different areas tehsil. After analysis of samples, it was observed that chemical constituents of ground water were not as per the permissible ranges of world health organization. Key words: Rajgarh, gound water fluoride, Nitrate, Chloride, Alkalinity, Hardness, TDS etc.