Do community water systems filter out disease-causing bacteria like Giardia and Cryptosporidium?

Giardia and Cryptosporidium are parasites commonly found in lakes and rivers, particularly if these bodies of water are contaminated with animal waste and sewage. Both parasites exist as cysts in the environment, and the cysts act as protective covers to the parasites inside them. For this reason, Giardia and Cryptosporidium are very resistant to disinfection, and even well operated water treatment systems cannot ensure their complete removal. Currently, there is an EPA drinking water standard established for Giardia, but the regulations do not adequately address the complete removal of Cryptosporidium. Home Page | FAQs | Glossary | Contact Us