Nestled in mountains a few hours’ drive from the US border, industrial powerhouse Monterrey boasts living standards that many Mexicans could only dream of.

Residents of the northern city, whose metropolitan area is home to around five million people, have in general been spared the chronic lack of services that plagues many poorer areas of the country.

But for several weeks, a heat wave and dearth of rain means that Monterrey has had running water for only a few hours a day.

In disadvantaged neighborhoods perched on hills, it has been more than 50 days since some residents last saw a drop from their faucets