Ongoing cyber threats to local water and wastewater systems were flagged in an advisory jointly sent out by the FBI, the EPA, and the Cybersecurity and Infrastructure Security Agency (CISA) last week. It warned that systems to ensure that sewage and other biohazards stay out of our drinking water are vulnerable. The advisory pointed to several cyberattacks in the last few years, like one in Oldsmar, Florida where someone tried to hack in and dump extra chemicals in one municipal system. CISA is urging water and wastewater facilities to plan for, and get ready to block, these attacks. Marketplace’s Kimberly Adams speaks with Kim Zetter, a cybersecurity journalist and author.