Today, Thursday, Sept. 28, 2023, the Baltimore City Department of Public Works (DPW) announced that during a routine test of the Druid Lake Reservoir low levels of the microscopic parasite Cryptosporidium were discovered. Cryptosporidium is a microorganism commonly found in lakes and rivers, which can potentially cause gastrointestinal problems, particularly, in those who are immunocompromised, elderly, or children.