In September of this year, routine testing turned up the presence of a microscopic parasite called cryptosporidium in Baltimore’s water supply. Johns Hopkins environmental health scientist Natalie Exum returns to the podcast to speak with Lindsay Smith Rogers about what the parasite’s presence means for the larger water system, and why it’s critical to repair and replace aging infrastructure throughout the US. Note: This podcast was recorded in November. Since then, President Biden has proposed a new plan to remove all lead water pipes across the country. Learn more about another one of our projects, the Expert Insights newsletter: http://publichealth.jhu.edu/subscribe