Tennessee Dental Authority · City Fluoride Guide
Fluoride in Lenoir City, Tennessee
Last updated: October 20, 2026
Lenoir City's water is fluoridated. The Lenoir City Utilities Board reports fluoride by treatment plant, and in 2025 both plants averaged about 0.37 mg/L — Plant #1 averaged 0.3735 mg/L and Plant #2 averaged 0.3665 mg/L. That is roughly half the CDC recommended level of 0.7 mg/L, and far below both EPA standards. You still need fluoride toothpaste every day.
Water quality in Lenoir City
Curious about your tap water? Tennessee Water Authority has the full Lenoir City water quality guide — contaminant data, utility details, and filter recommendations.
Lenoir City at a glance
Those figures come from LCUB's Water Quality Report 2025, published on the utility's own site, lcub.com. LCUB reports fluoride separately for each of its two treatment plants rather than as one system-wide number, based on quarterly samples taken through 2025 — so this page shows both plants instead of a single figure. Read it in full in the sources below.
How Lenoir City compares
Two different kinds of benchmarks matter here, and they are often confused. The CDC figure is a recommendation — the level thought to balance cavity prevention against the risk of mild fluorosis. The EPA figures are safety ceilings. Lenoir City's two plants both average about 0.37 mg/L — roughly half the CDC recommendation, and far under both EPA ceilings.
| Benchmark | Level | What it means for Lenoir City |
|---|---|---|
| Lenoir City Plant #1 (LCUB, 2025) | 0.3735 mg/L average samples 0.339–0.417 mg/L | About 0.37 mg/L — roughly half the CDC recommended level |
| Lenoir City Plant #2 (LCUB, 2025) | 0.3665 mg/L average samples 0.333–0.410 mg/L | About 0.37 mg/L — roughly half the CDC recommended level |
| CDC recommended level | 0.7 mg/L | The target for community water fluoridation |
| EPA secondary (non-enforceable) standard | 2.0 mg/L | Guideline aimed at preventing noticeable tooth discoloration; Lenoir City is well below it |
| EPA enforceable maximum contaminant level (MCL) | 4.0 mg/L | The legal ceiling; Lenoir City is far below it |
One honest note about how to read this: there is no single Lenoir City fluoride number. LCUB reports each plant separately, and the two plants run close together — Plant #1 averaged 0.3735 mg/L and Plant #2 averaged 0.3665 mg/L across quarterly 2025 samples, with every individual sample between 0.333 and 0.417 mg/L. Either way you slice it, the water runs at about 0.37 mg/L — roughly half the CDC recommended level, not at it.
Do you still need fluoride toothpaste?
Yes. Think of drinking water as background exposure: small amounts of fluoride through the day that help teeth resist acid between brushings. Toothpaste does a different job — it puts a much higher concentration of fluoride directly on the tooth surface, twice a day, where decay actually starts.
Fluoridated water does not replace brushing, and brushing does not make the water pointless. They work together. Brush twice daily with fluoride toothpaste, and spit rather than rinsing heavily right away so the fluoride stays in contact with your teeth a little longer.
Fluoride and kids
Children get the biggest benefit from fluoride — and they are also the group where amount matters most, because swallowing too much toothpaste over time can cause mild fluorosis (faint white flecking on permanent teeth). The ADA amounts are simple:
How much toothpaste
Under age 3: a rice-grain smear of fluoride toothpaste.
Ages 3 and up: a pea-size amount.
Supervise brushing, teach spitting, and remind kids not to swallow toothpaste. Those three habits matter more than any brand on the shelf.
Because Lenoir City's water runs at roughly half the CDC recommended level, there is no reason to switch your child to fluoride-free toothpaste out of caution — if anything, toothpaste matters more here, not less. If your child also drinks a lot of bottled or filtered water, mention it at their next dental visit so the full picture gets weighed.
What about fluoride varnish at the dentist?
Varnish is a concentrated fluoride coating painted on during a checkup. It is one of the cheapest preventive treatments in dentistry, and the case for it depends on cavity risk more than on any single water number.
In Lenoir City, at about 0.37 mg/L — roughly half the CDC recommended level — the water's background protection is lighter than the target, so varnish remains worthwhile for kids and for adults at higher cavity risk: people with recent cavities, dry mouth, braces, or exposed root surfaces. For a low-risk adult with no recent decay, it is a reasonable conversation rather than a must. Either way, it is not urgent and it is not a sales pitch to fear — ask what your own risk is based on, and expect a straight answer.
On a private well?
Well water is not fluoridated by any utility. If your home in the Lenoir City area is on a private well, the LCUB numbers on this page do not apply to your tap. Your well may carry little or no natural fluoride, or occasionally more than you would expect.
Test it before assuming. A water test that includes fluoride gives you a real number, and your dentist can help you decide what it means for toothpaste, rinses, or supplements — especially for children.
How to confirm this yourself
You do not have to take our word for any of this. Two checks take five minutes:
1. Read LCUB's Water Quality Report 2025. The figures on this page come from the Lenoir City Utilities Board Water Quality Report 2025 (PDF, lcub.com). Look for the fluoride rows — LCUB lists them separately for Plant #1 and Plant #2, with each plant's average and range of quarterly samples.
2. Check CDC's My Water's Fluoride. The CDC's My Water's Fluoride tool lets you look up your water system and see its fluoridation status as reported to the CDC. Search for it by name on the CDC website and compare it with the CCR.
Want the statewide picture first? Start with our Tennessee fluoride guide, which explains how fluoridation works, where the benchmarks come from, and how to read any city's numbers.
Frequently asked questions
Is Lenoir City's water fluoridated?
Yes. The Lenoir City Utilities Board (LCUB) adjusts fluoride in the water it treats from the Tennessee River. Fluoridation is active, not just naturally occurring.
What is the fluoride level in Lenoir City?
LCUB reports fluoride by treatment plant, not as one system-wide figure. In its Water Quality Report 2025, Plant #1 averaged 0.3735 mg/L (samples 0.339 to 0.417 mg/L) and Plant #2 averaged 0.3665 mg/L (samples 0.333 to 0.410 mg/L) in quarterly 2025 samples. Both plants averaged about 0.37 mg/L — roughly half the CDC recommended level of 0.7 mg/L.
Why does Lenoir City report two fluoride levels instead of one?
Because LCUB treats water at two plants and reports fluoride separately for each one. In the quarterly 2025 samples published in its Water Quality Report 2025, Plant #1 averaged 0.3735 mg/L with samples from 0.339 to 0.417 mg/L, and Plant #2 averaged 0.3665 mg/L with samples from 0.333 to 0.410 mg/L. The two plants run very close to each other — both about 0.37 mg/L on average — but there is no single system-wide figure, so we show both rather than invent one.
Is about 0.37 mg/L safe compared with EPA limits?
Yes, by a wide margin on the EPA scale. The EPA enforceable maximum contaminant level (MCL) is 4.0 mg/L and the EPA secondary (non-enforceable) standard is 2.0 mg/L. Both LCUB plants averaged about 0.37 mg/L in 2025, and even the highest individual sample, 0.417 mg/L, sits far below both EPA standards.
If the water is fluoridated, do I still need fluoride toothpaste?
Yes. Drinking water provides background fluoride exposure through the day, but toothpaste delivers fluoride directly to the tooth surface where it does the most work. Brush twice a day with fluoride toothpaste — fluoridated water is not a substitute for it.
How much toothpaste should my child use?
Follow the ADA amounts: a rice-grain smear of fluoride toothpaste for children under age 3, and a pea-size amount for ages 3 and up. Supervise brushing, teach your child to spit, and help them avoid swallowing toothpaste.
Is fluoride varnish at the dentist still worth it in Lenoir City?
Often, yes. At about 0.37 mg/L — roughly half the CDC recommended level — Lenoir City's water provides lighter background protection than the target, so varnish remains worthwhile for kids and for adults at higher cavity risk. Ask your dentist about your own risk — it is a quick, low-cost treatment, not an emergency need.
What if I have a private well in the Lenoir City area?
Well water is not fluoridated by any utility. Your well may contain little or no natural fluoride, or occasionally more. Test it before assuming either way, and talk with your dentist about the result before adding or skipping fluoride products.
Sources
- Lenoir City Utilities Board, Water Quality Report 2025 (lcub.com) — fluoride by treatment plant, quarterly 2025 samples: Plant #1 average 0.3735 mg/L, range 0.339–0.417 mg/L; Plant #2 average 0.3665 mg/L, range 0.333–0.410 mg/L: https://www.lcub.com/wp-content/uploads/2026/06/2025-LENOIR-CITY-UTILITIES-BOARD-WATER-QUALITY-REPORT-2-AutoRecovered-Copy.pdf
- CDC — recommended fluoride level for community water systems: 0.7 mg/L (CDC recommended level), via CDC community water fluoridation guidance and My Water's Fluoride.
- U.S. EPA — National Primary Drinking Water Regulations: fluoride maximum contaminant level (MCL) 4.0 mg/L; secondary standard 2.0 mg/L.
- American Dental Association — toothpaste amounts for children: rice-grain smear under age 3, pea-size amount ages 3 and up.