Emergency officials warned "there are no shelters, no electricity, very limited resources for food, gasoline and supplies, and absolutely no medical services."
People have taken to the streets in the southwestern province of Khuzestan to protest water scarcity and power cuts.
Demonstrators in Delhi were attempting to cut the water supply to government officials' homes when they were hit with the cannons.
Tribes in the Colorado River Basin have been trying to claim their legal access to its water for years. The drought has only increased their struggles.
The Santa Clara Valley Water District has placed several limitations on water usage, including a cap on the use of drinking water for watering ornamental landscapes and lawns.
"It's a historic mistake the city has had to pay for more than 500 years," the head of the city's municipal water system said.
Water shortages in Jordan pit rich against poor as the country scrambles to serve a booming population.
Science got California into this desperate, desiccated mess. Can it also save it?
There's a lack of respect among warring sides for the protected status of water, according to the Red Cross.