Evette Gilard’s skin itched so badly that it woke her one night in early 2019. When she searched her apartment, she discovered a thick rind of black mold in the threshold of her bedroom closet, and another in her hallway. There had been an apartment fire upstairs months earlier, and Gilard supposed that water damage from the firefighters had caused the mold. She knew that her little subsidized one-bedroom in Antioch, California, was not exactly a luxury condo, but now she feared for her health.