A point of use water purifier for use in rural and under developed areas having a supply reservoir chamber in a first container and a treatment reservoir chamber in a second container underlying the first container and into which the first container is fitted, the water purifier employing a UV radiation source to selectively on demand expose untreated water selectively delivered from the supply reservoir chamber to the treatment reservoir chamber prior to dispensing water from the water purifier for consumption. The water purifier is connectable to an electrical power source such as a 12 volt battery or solar powered battery and is effective to remove substantially all viruses, bacteria and mold spores from untreated water in a short time upon exposure to UV radiation.