It is a well known fact that clean water is absolutely essential for healthy living. Adequate supply of fresh and clean drinking water is a basic need for human beings on the earth. That is why drinking contaminated water is the primary cause of  diseases. Harmful organisms such as bacteria protozoa, or viruses travel through water sources and reach people upon drinking. Many areas ground water and surface are now contaminated with heavy metals. POPS (precedent organic pollution), and nutrients that have an adverse effect on or health. Making water borne diseases and water caused health problems are very common today such as diarrhea. cholera, typhoid, hepatitis A, flukes, chemical contamination, lead, pesticides, and arsenic poisonings. Even if a water is to acidic or basic can weaken our bodies and origins. 

Water caused diseases: 
Diarrhea: Caused by variety of micro-organisms including viruses, bacteria and protozoans.  
Cholera: A acute bacterial infection of intestinal tract. It causes diarrhea that can lead to dehydration and death. This is also a world wide problem. 
Typhoid: A fever that is a bacterial infection caused by injecting contaminated food or water. 
Hepatitis A: This condition is acquired when drinking fecal contaminated water. Some symptoms fatigue, fever, abdominal pain, itching, and jaundice.