**4. Conclusion**

Water pollution is a global problem, and the world's population is suffering the consequences of tainted water. Living organisms are also affected by the polluted water very much and it is very harmful to the environment. Acute and choric illnesses are caused by heavy metal concentrations in drinking water that exceed the permissible limits set by several national and international organizations. These can range from nonfatal, such as muscle and physical weakness, to fatal, such as brain, nervous system, and even cancer. Water quality testing is necessary for the protection of human health and the environment.

*Heavy Metal Contamination of Water and Their Toxic Effect on Living Organisms DOI: http://dx.doi.org/10.5772/intechopen.105075*
