Living with lead—a neurotoxin that can cause low IQs, behavioral and learning issues for children, and high blood pressure, pain, or memory loss for adults—is something every homeowner or renter wants to avoid. But the unfortunate reality is that lead can be found in many homes we live in, buildings we frequent, and infrastructure we depend on.

Lead concerns can be as personal as discovering lead paint in beloved built-ins at home and as detrimentally widespread as water contamination from lead pipes in Flint, Michigan. So how much of a risk does it pose in your life? And if you think there’s lead in your home, what should you do?

Curbed spoke with three environmental experts about when and how to test for lead, whether you’re a homeowner or renter. In tackling this scary neurotoxin, knowledge is power—and proper testing and treatment can make it manageable.