Can you not read? It's right in the politifact article you keep quoting. The official poverty measure is around 15%, supplemental is 20.6.
"From 2013 to 2015, California had America?s 17th-highest poverty rate, 15 percent, according to the U.S. Census Bureau?s Official Poverty Measure. That measure uses income levels to determine poverty, but does not consider differences in cost-of-living among states. It lists the official poverty threshold for a two-adult, two-child family at $24,036 in 2015.
During the same period, California had the highest poverty rate, 20.6 percent, according to the census? Supplemental Poverty Measure."