Physico-chemical analysis of groundwater in Churu block was performed to have a clear picture of water quality so that remedial measures could be worked for. Fluoride higher thatn 2ppm may cause osteoporosis and fluorosis. High nitrate is alarming as it indicates possibility of seepage from sewage. Many samples had fluoride within the maximum permissible limits recommended by ICMR yet most of the water is not potable due to high nitrate.