Testing conducted by federal and state labs found no radiation safety risk to families living in homes built with drywall manufactured in China, the Consumer Product Safety Commission said Monday.

The Los Angeles Times ran an investigative story in July, revealing that phosphogypsum, a radioactive byproduct of phosphate fertilizer production, is commonly used in some Chinese-made drywall.

Florida and federal agencies responded by ordering more tests on samples. The commission said 21 samples were analyzed from homes and manufacturers of drywall, according to a news release.

Seventeen samples were obtained from manufacturers and suppliers in multiple states, and four were obtained from homes in Florida exhibiting copper corrosion, odors and occupant complaints.

Results of the phosphogypsum testing showed levels of radiation that do not pose a radiation safety risk to families.

Radiation levels were found to be comparable to “background” levels found in soil, brick and concrete. Investigations to find answers and solutions to the drywall issue are continuing on multiple tracks, according to the news release.

The Florida Department of Health has received more than 500 complaints of Chinese drywall in homes, with the majority in South or Southwest Florida. The problem drywall has been associated with metal corrosion in air conditioners and electrical wiring, odors and health complaints.

Previous testing of problem drywall showed higher levels of sulfur compounds in Chinese drywall compared to domestic brands, and strontium, which was not found in domestic brands. Additional test results on indoor air sampling at several homes are expected soon

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