Giardia, a microscopic parasite that can be located in water sources, particularly in untreated or inadequately treated water. It’s known to cause waterborne illnesses and can lead to a diarrheal illness called giardiasis when ingested, as the transmission of giardia occurs through water form food contaminated with the parasite once consumed. It is able to spread through direct contact with infected individuals or animals and can survive for extended periods in water and is resistant to chlorine disinfection commonly used in water treatment. Symptoms of giardiasis may include diarrhea, abdominal cramps, bloating, fatigue and weight loss, while most cases resolve without treatment, some individuals may experience persistent or severe symptoms that require medical attention. To prevent transmission of giardia and protection against giardiasis, it is essential to treat water from potentially contaminated sources before consumption. Boiling water or using filtration systems capable of removing giardia, such as submicron filters, are effective methods to reduce the risk of infection. Proper sanitation measures and personal hygiene methods are crucial in the prevention of the spread of giardia and other waterborne diseases.