Fluoride in Kingsport’s Water

Last updated: October 20, 2026

Kingsport’s water is fluoridated — its own report says so — but the measured level, 0.35 mg/L, is about half the CDC recommendation of 0.7 mg/L. The Kingsport Water Department treats South Fork Holston River water and states plainly in its Consumer Confidence Report that the filtered water is treated with fluoride to reduce tooth decay. The level it actually measured in 2024, though, sits well below the target — a fact that matters for how much your toothpaste and your dentist’s fluoride treatments are doing. Here is what the utility’s own numbers say, and what they mean for your teeth.

This page is part of our Tennessee fluoride guide, which explains how fluoridation works, where the recommended levels come from, and how to check any Tennessee city.

Water quality in Kingsport

Curious about your tap water? Tennessee Water Authority has the full Kingsport water quality guide — contaminant data, utility details, and filter recommendations.

The short versionKingsport’s fluoride facts

Utility
Kingsport Water DepartmentTreats South Fork Holston River water with its own system
Public water system ID
TN0000349
Fluoridation status
FluoridatedThe utility’s CCR states it treats the filtered water with fluoride to reduce tooth decay
Measured level (2024)
0.35 mg/LRange 0.31–0.40 mg/L, from daily samples

All figures are from the Kingsport Water Department’s 2024 Consumer Confidence Report (revised, published 2025) and describe Kingsport Water Department customers. Bloomingdale Utility District and First Utility District of Hawkins County also serve parts of the area — their fluoridation status was not verified for this page, so check your water bill to see which system serves your home.

The numbersHow Kingsport’s level compares

Fluoride levels get argued about a lot, so let’s keep the comparison simple and use the benchmarks exactly as the agencies state them. Kingsport fluoridates, and at the same time its measured level is roughly half of what the CDC recommends — both of those things are true at once, and neither one cancels the other out.

Fluoride levels in milligrams per liter (mg/L)
Level mg/L What it is
Kingsport Water Department (2024 average) 0.35 Measured average from daily samples; range 0.31–0.40 mg/L
CDC recommended level 0.7 The level the CDC recommends for community water fluoridation
EPA secondary (non-enforceable) standard 2.0 A guideline aimed at preventing cosmetic effects on teeth
EPA enforceable maximum contaminant level (MCL) 4.0 The legal limit a water system may not exceed

Read plainly: Kingsport’s 0.35 mg/L is about half the CDC recommended level of 0.7 mg/L, and it is far below both EPA standards — the secondary standard of 2.0 mg/L and the enforceable MCL of 4.0 mg/L. Whatever side of the fluoride debate you land on, this is a low level by every official yardstick.

The trend: Kingsport’s reported fluoride average has declined over the years — 0.64 mg/L in 2017 → 0.58 in 2019 → 0.45 in 2021 → 0.35 in 2024. We report the utility’s own figures and don’t speculate about why the level has come down; that is a question for the utility.

At homeDo you still need fluoride toothpaste?

Yes. Fluoride in drinking water works as background exposure — small amounts, spread across the day, every time you drink, cook, or make coffee. Toothpaste delivers fluoride directly onto the tooth surface at much higher concentration, twice a day, right where decay starts. The two are partners, not substitutes.

And in Kingsport the background is modest: at 0.35 mg/L, the water supplies about half the CDC recommended level. That makes the toothpaste half of the equation more important here, not less. Brush twice a day with fluoride toothpaste, spit, and don’t rinse it all away immediately — let the residue keep working.

ChildrenFluoride guidance for kids

Kids get the most benefit from fluoride — their enamel is still developing — and they’re also the ones most likely to swallow toothpaste, which is why the amount matters. The American Dental Association’s guidance is simple:

With Kingsport’s water at about half the recommended level, children here are not getting an unusually large fluoride dose from the tap. The rice-grain and pea-size amounts above are the standard guidance everywhere — follow them and you’re in line with what the ADA recommends.

At the dentistFluoride varnish and in-office treatments

Professional fluoride varnish — the quick coating painted on during a cleaning — is worth a slightly longer look in Kingsport than in a city running at the full 0.7 mg/L. Because the water here supplies only about half the CDC target, the extra fluoride from a varnish treatment carries somewhat more value, especially for kids and for adults at higher risk of cavities: people with dry mouth, braces, exposed roots, or a recent run of new cavities.

Frame it honestly, though: this is a modest, inexpensive preventive step, not a response to an emergency. Kingsport’s water is fluoridated and its level is far below every safety limit. If your dentist suggests varnish, it’s a reasonable conversation about your individual risk — ask what they’re seeing in your mouth that points that way.

Outside city waterOn a private well?

None of this applies to well water. No utility fluoridates a private well, and natural fluoride levels in groundwater vary from place to place — some wells carry almost none, others carry more than city water. If your home is on a private well, don’t assume your fluoride exposure is covered, and don’t assume it’s zero either. Have the water tested, then talk with your dentist about what the result means for toothpaste and treatments.

Check it yourselfHow to confirm Kingsport’s fluoride status

Don’t take our word for it — the primary source is public:

The honest bottom line

People argue about fluoride from both directions — some want none at all, others worry Kingsport isn’t getting enough. The utility’s own measurements cut through both arguments: Kingsport fluoridates, the level is 0.35 mg/L, that’s about half the CDC recommendation, and it’s far below both EPA limits. What you do with that — toothpaste, varnish, a water test — is a calmer decision with the real number in hand.

Common questionsFluoride in Kingsport — FAQ

Where this came fromSources