until 7 p.m. Wednesday.

The strike could affect a number of services, including the county’s nonurgent health clinics, public libraries, wildfire cleanup services, trash pickup and homeless encampment enforcement.

“This is the workforce that got L.A. County through emergency after emergency: the January wildfires, public health emergencies, mental health emergencies, social service emergencies and more,” David Green, SEIU 721’s executive director and president, said in a statement. “From the San Fernando Valley to the San Gabriel Valley, from the foothills to the beaches, all across L.A. County, we get the job done. That’s why we have had it with the labor law violations and demand respect for our workers.”

The union accuses L.A. County management of refusing to bargain with union members in good faith and allege retaliation and surveillance of union members. It has alleged 44 labor law violations during contract negotiations.

The union claims the county’s proposal was a 0% increase for cost of living, and alleges the Board of Supervisors was able to spend $205 million on a downtown skyscraper for new office space while maintaining there’s no money for front-line staff.

The county disputes those claims, saying there are other costs the county is facing, including $4 billion on sex assault claims and $2 billion in impacts from January’s wildfires “and the potentially catastrophic loss of hundreds of millions or more in federal funding.” The county CEO recently released the budget proposal for the coming year, including 3% cuts to some departments and the elimination of more than 200 vacant positions.

“We are working hard to make sure our labor partners understand the financial reality of our situation,” a county statement read. “Despite the severity of our fiscal outlook, the county has made fair and responsible counter proposals that we hope the union will seriously consider. We are committed to continuing constructive negotiations and to joining with labor on something we can all agree on — which is the County’s absolutely essential role in serving the people who rely on us not just for safety net services but to make their lives better.”

The previous contract with the union expired in March.

County library officials issued a statement saying the strike could affect services and possibly force temporary closures of some library locations.

“We are closely monitoring the situation and are preparing our operations for the strike’s potential impact on library services,” County Librarian Skye Patrick said in a statement. “In the event we have to temporarily close our libraries, we recommend customers access our Digital Library, which is open 24/7. We encourage customers to stay informed by checking our website for regular updates as the events unfold.”

Some nonurgent county clinics will be closed during the two-day strike, some beach restrooms may be closed, and there may be some delays in services provided by the medical examiner.

Residents can go to lacounty.gov/closures for details on possible closures or service delays caused by the strike.

The Associated Press contributed to this report.