Fluoride in Thompson's Station, TN

It depends on your utility — Thompson's Station is a split town. Addresses on H.B. & T.S. or Milcrofton get Harpeth Valley (HVUD) water, fluoridated at an average of 0.53 mg/L. Franklin Water Department addresses get fluoridated water at 0.71 mg/L from the city's own plant, or HVUD water at 0.53. But Spring Hill Water Department addresses are NOT fluoridated — Spring Hill's own reports state it no longer fluoridates, with only about 0.011 mg/L of natural fluoride — and Maury County Water System buys its water from Columbia Power and Water, which has not fluoridated since 2013.

By utility: H.B. & T.S. and Milcrofton customers — 0.53 mg/L average (HVUD water, range 0.25–0.65 mg/L). Franklin Water Department customers — 0.71 mg/L on the city's own plant water, 0.53 mg/L where the supply is purchased HVUD water. Spring Hill customers — about 0.011 mg/L, naturally occurring only (2018 report, the most recent retrievable). Maury County Water System customers — no published level; its source water (Columbia) is not fluoridated.

It is below the CDC recommended level of 0.7 mg/L — about three-quarters of it — and this page states that plainly rather than rounding it up. It is still far below both EPA standards: the secondary (non-enforceable) standard is 2.0 mg/L and the enforceable maximum contaminant level (MCL) is 4.0 mg/L. Brushing twice daily with fluoride toothpaste covers the rest of what your teeth need.

Then use your own utility's row on this page, not the headline. Franklin Water Department means 0.71 mg/L (own plant) or 0.53 mg/L (blended HVUD water). Milcrofton means HVUD water at 0.53 mg/L average. Spring Hill Water Department means not fluoridated — about 0.011 mg/L natural fluoride only. Maury County Water System means Columbia-supplied water that is not fluoridated, with no published level. Your bill names the system that governs your tap.

Yes — on every system here. Fluoridated drinking water is background exposure, and on the Spring Hill and Maury County systems there is effectively no fluoride in the water at all. Toothpaste delivers the concentrated dose that does most of the work. Brush twice a day with fluoride toothpaste regardless of which utility serves you.

The ADA's guidance: for children under age 3, use a smear of fluoride toothpaste about the size of a grain of rice. For ages 3 and up, a pea-size amount is enough. Supervise brushing, teach your child to spit the toothpaste out rather than swallow it, and remember that more paste on the brush does not mean cleaner teeth — the small amounts are deliberate, because young kids swallow some no matter what.

For many people, yes — and the case is strongest on the systems that run low or not at all: HVUD water at 0.53 mg/L, and Spring Hill or Maury County water with no added fluoride. An in-office fluoride treatment or varnish puts a much stronger dose directly on the teeth, and it remains worthwhile for kids and for adults at higher cavity risk — people with recent cavities, dry mouth, braces, or exposed roots. If your cavity risk is low, ask your dentist to explain your risk either way.

No utility fluoridates private well water — nobody adjusts it at all. Well water can contain some naturally occurring fluoride, a lot, or almost none, and you cannot tell by taste. If your home is on a well in Williamson or Maury County, have the water tested before assuming anything about its fluoride level, and tell your dentist you are on well water so your fluoride plan reflects it.

Start with your own utility's current water quality report — the reports behind every figure on this page are linked in the sources below. Spring Hill's reports state its non-fluoridation in plain words. You can also check CDC's My Water's Fluoride, which tracks fluoridation status and levels by water system. The utility named on your bill is the one whose number governs your tap.