1.  Fluoride- It can harm the thyroid gland and calcify the pineal gland.
2. Chlorine- exposure can cause respiratory problems and damage cells. Long term effects include memory loss and impaired balance
3.  Lead -Corroded pipes are releasing up to ten times the allowable amount of lead into the water. Lead is toxic to almost every organ and affects children the worst
4. Mercury-Although mercury is a naturally occurring element, “natural” does not mean “safe.” Mercury is extremely toxic and can cause brain damage, blindness, nerve damage, cognitive disability, impairment of motor functions, headaches, weakness, muscle atrophy, etc..
5.  PCB’s (polychlorinated biphenyls)- Although PCBs were banned in 1979, they're still present in landfills and pose a danger to the environment. PCBs break down slowly and infiltrate the environment.
6. Arsenic- Arsenic, despite being poisonous, is used in a multitude of industrial processes. Environmental contamination may result from improper waste disposal, or from poorly-planned wells that hit a natural source.
7.  HCB (hexachlorobenzene) -Until 1965, HCB, or Hexachlorobenzene, was used as a pesticide. Production has been banned, but it is still formed as a byproduct from the production of other chemicals and existing products can be used until supplies are gone. A large dose can result in death.
Some people are under the impression that they can remove toxins from water by boiling it. Boiling water kills harmful organisms but does nothing to remove toxic chemicals, compounds, salts, and metals. This is by no mean a complete list of all the toxins that might be in drinking water. If poor-quality tap water is a problem for you, we recommend investing in a quality water filter system either with the convince of a whole house system or filtered water right from your sink.