Is the water fluoridated?

Whether the water reaching each ZIP is fluoridated, from the Ohio Department of Health's report to CDC's My Water's Fluoride, with the treatment steps the serving system registers with EPA and, where it buys its water, the steps of the utility that treats it (a buyer such as Gahanna registers no treatment of its own because Columbus fluoridates the water before selling it), with the whole treatment train on the card: chlorination or chloramine, softening, iron removal, activated carbon, membranes. Ohio has required fluoridation of systems serving 5,000 or more people since a 1969 law, unless the community exempted itself by ordinance or vote in the window the law allowed, which is why a handful of cities sit unfluoridated among fluoridated neighbours; smaller systems and naturally fluoridated wells decide for themselves. EPA's 2012 to 2019 compliance samples give the fluoride actually measured leaving the plant. Blue is fluoridated, teal natural fluoride at the dental level with no fluoridation step, gold not fluoridated.

673 of 1,233 ZIPs have data.

Legend

Map of Ohio by Fluoride and treatment

Source

CDC My Water's Fluoride (fluoridation status of each system as reported by the Ohio Department of Health, fetched 2026-09-10); SDWIS treatment table (Envirofacts): each system's registered treatment steps, inherited from the supplier for systems that buy their water; Ohio Department of Health county fluoridation profiles (DataOhio); EPA Six-Year Review 4 compliance monitoring fluoride results by system, 2012 to 2019

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