Fluoride Action Network

U.S. Water Systems with High F Levels

Database of drinking water systems with high levels of naturally occurring fluoride; searchable by state.


Most fresh surface water (e.g., lakes, rivers, streams, and springs) contain very low levels of fluoride. However, as with other toxic substances, such as arsenic and lead, some water supplies — particularly those that draw water from deep underground — are contaminated with high levels of naturally occurring fluoride.  In this section of the website, we provide a list of water systems in the United States that have been identified as having high levels of naturally occurring fluoride.

The information in this series comes primarily from the Centers for Disease Control and Prevention’s (CDC) 1993 report titled Fluoridation Census and their 2020 Fluoridation Status Reports by state. However, the CDC’s 2020 report did not list all states in either 1993 or 2020.

In 1993, the CDC did not list the natural levels of fluoride in drinking water for AK, AR, HI, KY, ME, NY, PA, RI, TN, VT, and WV, and provided very little information for some others.

In 2020, the CDC did not do a Fluoridation Status Report for these 18 states, AZ, HI, ID, MD, MT, NJ, NM, NY, NC, OH, OK, OR, PA, SD, UT, WA, WI, WY. We will be doing everything we can to get data for these states and will update this series as we receive the data. If you want to help in this effort or have information about elevated fluoride levels in communities that we have not identified, please email us.

Search by State
Alabama (1993)
Alabama (2020)
Louisiana (1993)
Louisiana (2020)
Alaska (1993)
Alaska (2020)
Maine (1993)
Maine (2020)
Arizona Maryland Oregon
Arkansas (1993)
Arkansas (2020)
Massachusetts (1993)
Massachusetts (2020)
California (1993)
California (2020)
Michigan (1993)
Michigan (2020)
Rhode Island (1993)
Rhode Island (2020)
Colorado (1993)
Colorado (2020)
Minnesota (1993)
Minnesota (2020)
South Carolina (1993)
South Carolina (2020)
Connecticut (1993)
Connecticut (2020)
Mississippi (1993)
Mississippi (2020)
South Dakota
Delaware (1993)
Delaware (2020)
Missouri (1993)
Missouri (2020)
Tennessee (1993)
Tennessee (2020)
Florida (1993)
Florida (2020)
Montana Texas (1993)
Texas (2020)
Georgia (1993)
Georgia (2020)
Nebraska (1993)
Nebraska (2020)
Hawaii Nevada (1993)
Nevada (2020)
Vermont (1993)
Vermont (2020)
Idaho New Hampshire (1993)
New Hampshire (2020)
Virginia (1993)
Virginia (2020)
Illinois (1993)
Illinois (2020)
New Jersey Washington State
Indiana (1993)
Indiana (2020)
New Mexico West Virginia (1993)
West Virginia (2020)
Iowa (1993)
Iowa (2020)
New York Wisconsin
Kansas (1993)
Kansas (2020)
North Carolina Wyoming
Kentucky (1993)
Kentucky (2020)
North Dakota (1993)
North Dakota (2020)

Did You Know?
High Artificial Levels in U.S. School Water Systems

In the United States, elementary schools were once targeted in several states with high-dose fluoridation programs, where up to 5.4 ppm of fluoride was added to school drinking water.  It appears this practice began in the early 1970s and ended sometime in the late 1990s. As far as we know there has been no acknowledgement of its history in the many schools that installed these devices.


back to top