Information about the fluoridation levels in many community water systems can be found on the CDC Web site entitled My Water’s Fluoride (http://apps.nccd.cdc.gov/MWF/Index.asp). Not all communities report this information to the CDC; therefore, it may be necessary to contact the local water department to determine the level of fluoride in the community water. Well water must be tested for fluoride content before prescribing supplements; such testing is available in most states through the state or county public health laboratory.