Can there be too much fluoride in water?

The National Research Council released a statement in March 2006 addressing the levels of naturally-occurring fluoride in drinking water. The report concludes the EPA’s maximum natural fluoride goal of 4.0 milligrams per liter be lowered to protect the public’s health. 

The EPA is reviewing the new assessment of fluoride along with other information (e.g., analytical methods and treatment feasibility, occurrence and exposure) to determine whether it is appropriate to revise the drinking water standard.

The NRC report does NOT call into question the safety of community water fluoridation at appropriate levels.