What germs stay in water?

Various germs can persist in water, including bacteria like E. coli and Salmonella, which can originate from fecal contamination. Viruses such as norovirus and hepatitis A can also survive in water, especially in untreated sources. Additionally, protozoa like Giardia and Cryptosporidium are resilient and can remain viable in water for extended periods. These pathogens pose significant health risks, particularly in recreational and drinking water sources.