Southern California Gas Co. late Monday reported a leak at the Aliso Canyon natural gas storage facility during a routine operation to pressurize equipment after maintenance.

In a community alert, the company said the leak occurred about 4:55 p.m. and didn’t pose any health risks, though it did produce a noticeable odor.

But Andrew Krowne, a Northridge resident who developed a cellphone application for those within 18 miles of the facility to report health issues, said 34 people reported symptoms including headaches, nosebleeds, and burning of the eyes and throat.

The leak was shut off within about 50 minutes and residents were notified about 7:40 p.m., according to the utility’s alert.


Since Krowne’s app became available in October, more than 150 users have reported 2,200 symptoms, he said.

The facility is the site of the largest methane leak in U.S. history. Starting in 2015, a ruptured well spewed tens of thousands of tons of gas, forcing roughly 8,000 families in the northwest San Fernando Valley from their homes. Many complained of health issues that included cancer, nausea and nosebleeds.

The blowout, which at its peak more than doubled the methane emissions of the entire Los Angeles Basin, took more than four months to plug. It sparked a political firestorm, with residents and elected officials demanding that the facility be shut down.

“It has no business being around homes,” Krowne said.


alene.tchekmedyian@latimes.com

Twitter: @AleneTchek