More than 2,000 mental health workers at Southern California’s Kaiser Permanente hospital are planning to walk off the job, their union said.

The union that represents nearly 2,400 mental health care workers in Southern California — 316 in San Diego County — filed a strike notice with Kaiser Permanente on Friday, putting their employer on notice that they intend to launch an “indefinite” strike starting on Oct.

The strike would be the second one in a little more than two years by California mental health workers at Kaiser Permanente. The clock is ticking to avoid a walkout.

The coalition of labor unions representing Kaiser Permanente health care workers has reached a tentative agreement with the company.

Kaiser patients waited 19 days for follow-up mental health appointments in 2019, nine days longer than state law permits.