The financial hub of one of the world's biggest economies is experiencing a water crisis so bad that experts say it could affect investors globally.
São Paulo, Brazil , is in the grips of the city's worst drought in the last half-century. The city's main water supply-called the Cantareira system-is running on emergency reserves. Normally at this time of year, the city's main supply would hold more than 155 billion gallons of water. But that water is all gone, and the government has been forced to tap into emergency reserves. (Tweet This)
"São Paulo's current drought emergency is both unprecedented and unpredicted," said World Bank Senior Water and Sanitation Specialist Juliana Garrido.
Before the 2014 drought, the system was supplying about 8,700 gallons of water a second, according to the World Bank. Today, it's operating at 3,563 gallons per second, according to data from Brazil's National Water Agency.
Martha Lu, a 43-year-old resident of São Paulo and water activist, said that she has seen neighbors fight over water access during temporary water shut-offs. She said she had to counsel a woman who was disposing of human waste in plastic bags so she could avoid buying expensive mineral water to fill her toilet.
The problem is even more acute in the suburbs of the city, which tend to be poorer than the city itself.
"They have two hours of water on tap-the women don't sleep because the water comes in the early hours of the morning, at around 4 a.m.," Lu said of suburban areas. "They don't have water storage, so they have to stay awake because they don't know when the water is coming again. They stay up to collect it in buckets and try to do laundry, it's terrible."
Beyond the dire situation for residents of São Paulo, the drought could threaten investors with money in Brazil, one of the so-called "BRIC" emerging-market economies that also include Russia, India and China. Though Rio de Janeiro is bigger, and Brasilia is the capital, São Paulo is the financial center of Brazil, which with an annual GDP of $1.9 trillion is the world's eighth-largest economy.
"American financial market investors in Brazil should be aware of the water shortages in the country, given their knock-on impacts on electricity prices, headline inflation and business confidence," Katherine Weber, head of Americas Country Risk Analysis at Fitch Group's BMI Research unit, told CNBC.
Brazil is seeing rising electricity prices and inflation as a result of São Paulo's water situation, according to Weber. São Paulo relies heavily on hydropower for electricity.