Data about each water system include facility location, population served, fluoridation status, natural fluoridation concentrations, system type. Laboratory testing, dates of facility inspections, and other relevant information are also included.
Public water systems in the United States.
The WFRS database structure is modeled using the same data strategy and structure as the Environmental Protection Agency's (EPA) Safe Drinking Water Information System, which permits exchange of data and updates on utility system configurations. State fluoridation managers enter data into WFRS and generate reports for state program use.
Response Rates and Sample Size:
There are about 54,000 community water systems included in WRFS. Of these, about 16,500 systems are listed as either having fluoride levels that are adjusted, are naturally occurring, or are consecutively fluoridated (purchased from a neighboring system that has optimally fluoridated water).