Ministry is blaming a shortage of water in several provinces on excess rice farming.
Construction sites without permits in cities could soon face a shortage of water.
Temperatures passed 50 degrees Celsius (122 Fahrenheit) in northern India as an unrelenting heatwave triggered warnings of water shortages and heatstroke.
Defence Ministry is preparing to address shortages of water during the dry season.
Prime Minister Hun Sen yesterday called on local authorities to advise farmers to cultivate dry-season rice once due to the dry spell and water shortage this year.
Hundreds of villagers in Khemarak Phoumint city are facing a water supply shortage.
The Ministry of Water Resources and Meteorology has announced that its officials are helping to provide water in provincial areas prone to water shortages.