Lancaster School District has asked the Los Angeles County Department of Public Health to inspect Sunnydale Elementary School.
Some parents claim a form of contamination, possibly mold, has been making students and teachers at the school sick.
PTA President Karaleigh Roe says illnesses attributed to the alleged contamination include hair loss, nose bleeds, asthma attacks, blood disorders and cancer.
Lancaster School District Superintendent Michele Bowers asserts the school is safe. An independent contractor has done 15 tests at Sunnydale since January.
Bowers says most of the tests, which each cost $3,000, were requested by teachers who wanted reassurance after talking to Roe about health issues on campus.
Bowers says the district uses an outside consultant because county public health officials are spread too thin and wouldn't be able to respond to her request fast enough.
"If there's something that needs to be addressed we will address it. That is my commitment to everyone over in Sunnydale," Bowers said.
The superintendent says public health officials will inspect the Sunnydale campus on Monday.
The department has admitted it mishandled Roe's original inspection request, saying training issues and the consolidation of its complaint department led to her request falling through the cracks.