Gliding above her neighborhood in a cable car on a recent morning, Sonia Estefanía Palacios Díaz scanned a sea of blue and black water tanks, tubes and cables looking for rain harvesting systems.

“There’s one!” she said, pointing out a black tank hooked up to a smaller blue unit with connecting tubes snaking up to the roof where water is collected.

“I’m always looking for different rainwater harvesting systems,” she said, smiling. “I’m also always looking for places to install one.”

Driven by prolonged drought and inconsistent public water delivery, many Mexico City residents are turning to rainwater. Pioneering company Isla Urbana, which does both nonprofit and for-profit work, has installed more than 40,000 rain catchment systems across Mexico since the company was founded 15 years ago. And Mexico City’s government has invested in the installation of 70,000 systems since 2019, still a drop in the bucket for the sprawling metropolis of around 9 million.

But there’s little education and limited resources to maintain the systems after installation, leading the systems to fall into disuse or for residents to sell off the parts.