<P> The most common threat to water security is water scarcity . There can be several causes to water scarcity including low rainfall , climate change , high population density , and overallocation of a water source . An example of periodic water scarcity in the United States is droughts in California . Another category of threats to water security is environmental threats . These include contaminates such as biohazards ( biological substances that can harm humans ) , climate change and natural disasters . Contaminants can enter a water source naturally through flooding . Contaminants can also be a problem if a population switches their water supply from surface water to groundwater . Natural disasters such as hurricanes , earthquakes , and wildfires can damage man - made structures such as dams and fill waterways with debris . Other threats to water security include terrorism and radiation due to a nuclear accident . </P>
<P> The most common threat to water security is water scarcity . There can be several causes to water scarcity including low rainfall , climate change , high population density , and overallocation of a water source . An example of periodic water scarcity in the United States is droughts in California . Another category of threats to water security is environmental threats . These include contaminates such as biohazards ( biological substances that can harm humans ) , climate change and natural disasters . Contaminants can enter a water source naturally through flooding . Contaminants can also be a problem if a population switches their water supply from surface water to groundwater . Natural disasters such as hurricanes , earthquakes , and wildfires can damage man - made structures such as dams and fill waterways with debris . Other threats to water security include terrorism and radiation due to a nuclear accident . </P>
three reasons responsible for water scarcity in india
three reasons responsible for water scarcity in india
low rainfall , climate change , high population density , and overallocation of a water source
low rainfall , climate change , high population density , and overallocation of a water source