4. Giardia Lamblia
This is a parasite that causes the infection, giardiasis (aka Beaver Fever). The incubation period for this organism is two weeks. Although unpleasant, it is not usually dangerous.
Found: It’s most commonly found in areas with poor sanitation (such as surfaces or in soil or contaminated food) as well as in unsafe water, or water that has been contaminated with faeces from infected people or animals.
5. Hepatitis A
Hepatitis A is a highly contagious liver infection caused by the hepatitis A virus. It might surprise you to learn that your water can also be contaminated with this infection! Hepatitis A has a very long incubation period and your symptoms may not show before twenty-eight days after being exposed. Hepatitis A is preventable by vaccine.
Found: When any water source, including private wells, is contaminated with faeces from infected humans, the water can potentially spread the Hepatitis A virus.