In Cambodia, people use groundwater as their source of freshwater. In some of those water source such as river, ponds, creeks…., some groundwater naturally contains dissolved elements such as arsenic, boron, selenium, or radon that these natural contaminants are health problems depends on the amount of the substance present. In purpose to support, enhance and develop water utilities in Cambodia so that a greater number of Cambodians have access to competitive, quality, lasting professional water services, provide all Cambodian people access to drinking for better living standard. iSEA was started as a project of GRET in 2012, to improving access to water and sanitation services is essential for public health, well being & economic development, and improved, supply water, sanitation and hygiene - reduce the risk of disease, and expense of families. Nowadays, iSEA upgraded bigger and bigger with professional services more than 10 years experience in the water supply sector.