Fluoride in Jefferson City’s water: required by city code, measured well below target
Jefferson City may be the best-documented fluoridation case in Tennessee — its own municipal code orders the water department to fluoridate — and still, the level actually measured in 2025 came in at barely a third of the national recommendation. Here is what the documents say, what the numbers show, and what it means for your teeth.
Jefferson City’s water is fluoridated — its city code requires it — but the measured level runs well below the CDC recommendation. Title 18, §18-127 of the city code directs the water department to fluoridate the supply, and CDC records show adjustment going back to December 1966. But Jefferson City’s own 2025 data averages just 0.26 mg/L — barely a third of the CDC’s recommended 0.7 mg/L — and individual samples ranged from 0.00 to 0.48 mg/L. “Fluoridated” is the policy. 0.26 mg/L is the measurement. This page is about the gap between the two.
Water quality in Jefferson City
Curious about your tap water? Tennessee Water Authority has the full Jefferson City water quality guide — contaminant data, utility details, and filter recommendations.
How this page works: Jefferson City does not publish its own Consumer Confidence Report online, so the fluoride figures here are Jefferson City’s own 2025 data table as republished in the Dandridge Water Management Facility’s 2025 Consumer Confidence Report — a neighboring system that buys Jefferson City water. Every number is cited to its source below; where the record runs out, we say so instead of speculating.
The facts, exactly as reported
Four cards: the utility, the legal status, the measured level, and — just as important — where the number comes from.
Utility Jefferson City Water & Sewer Commission
State system ID TN0000328, serving about 9,764 people. Its water comes from Mossy Creek Spring and Jarnigan Mine groundwater. Jefferson City is a source system — other districts buy its finished water, which matters below.
Status Fluoridated — directed by city code
Jefferson City’s municipal code, Title 18 §18-127 (“Fluoridation of water supply”), authorizes and directs the water department to fluoridate the water supply — you can read the code section yourself. CDC census records show the city has been adjusting fluoride since December 1966. Few Tennessee systems document their status this well.
Level 0.26 mg/L average (2025)
Jefferson City’s 2025 data reports an average fluoride level of 0.26 mg/L, a highest detected level of 0.48 mg/L, and a range of detections from 0.00 to 0.48 mg/L. That average is barely a third of the CDC recommended level of 0.7 mg/L, and the low end of the range reaches zero. We present the numbers exactly as reported — we do not round 0.26 up toward 0.7, and we don’t speculate about why the level runs low.
Provenance Where this number comes from
Jefferson City does not publish its own Consumer Confidence Report online. These figures are Jefferson City’s own 2025 water quality data table, republished in the Dandridge Water Management Facility’s 2025 Consumer Confidence Report — Dandridge buys water from Jefferson City and prints its suppliers’ data in its own report. The full citation is in the sources section.
On New Market or Shady Grove water? This page is about you, too
New Market Utility District and Shady Grove Utility District buy finished water from Jefferson City instead of treating their own, so their fluoridation status follows Jefferson City’s: fluoridated by policy, measured at the same 0.26 mg/L average in 2025. If one of those districts sends your water bill, Jefferson City’s numbers are your numbers.
Jefferson City’s level against the benchmarks
Every fluoride number needs its reference points. Here is Jefferson City’s measured level next to the CDC recommendation and both EPA standards, labeled the way the agencies label them.
| System / benchmark | Fluoride level | What it means |
|---|---|---|
| Jefferson City — measured (2025)Jefferson City Water & Sewer Commission, TN0000328 | 0.26 mg/L avg.Highest detected 0.48 mg/L; range 0.00–0.48 mg/L | The city’s own 2025 data table, republished in Dandridge’s 2025 CCR. Fluoridated by policy, but the average sits at barely a third of the CDC recommended level. |
| CDC recommended levelU.S. Public Health Service / CDC, since 2015 | 0.7 mg/L | The target for systems that adjust fluoride — judged to prevent cavities while keeping fluorosis risk low. A recommendation, not a law. |
| EPA secondary (non-enforceable) standardEPA secondary standard (SMCL) | 2.0 mg/L | A guideline aimed at preventing tooth discoloration (fluorosis) in children. Jefferson City’s level is far below it. |
| EPA enforceable maximum contaminant level (MCL)EPA, enforceable | 4.0 mg/L | The legal ceiling for fluoride in public drinking water. Jefferson City’s highest detected sample in 2025 — 0.48 mg/L — is far below it. |
Read the table plainly: Jefferson City is in no danger zone. It is far below both EPA standards, so the question here was never “too much.” The honest question is the opposite one — whether water averaging 0.26 mg/L delivers the cavity protection a fluoridation ordinance promises. The next section covers what to do about that.
Do you still need fluoride toothpaste? Yes — here, emphatically
This is where Jefferson City’s low measured level stops being trivia and starts changing what you should actually do. In a town whose water truly sat at 0.7 mg/L, the tap would carry a real share of cavity prevention. At 0.26 mg/L, it doesn’t — so the basics carry the load.
Yes Brush twice a day with fluoride toothpaste
Fluoride toothpaste is recommended whether or not your water is fluoridated, because it puts fluoride directly on the teeth where cavities start. At a measured average of 0.26 mg/L, Jefferson City’s water contributes only modest background exposure — helpful, but nowhere near the main event. Do not let the word “fluoridated” on a city document talk you out of the tube.
Kids Amounts by age (ADA)
Per the American Dental Association: for children under age 3, use a smear of fluoride toothpaste about the size of a grain of rice; from age 3 up, a pea-size amount. Supervise brushing, teach your child to spit the toothpaste out rather than swallow it, and keep the tube out of reach between brushings. The small amounts are deliberate — young children swallow much of what goes in their mouths.
Varnish In-office fluoride carries more weight here
Professional fluoride varnish — the concentrated coating painted on at the dental office — works directly on the teeth, so its value doesn’t depend on the tap. Because Jefferson City’s measured level runs well below target, varnish carries more value here than the “fluoridated” label alone suggests, especially for kids and higher-risk adults (recent cavities, dry mouth, heavy sugar exposure). Ask about it at your next visit; your dentist can weigh your actual risk.
Ask first Supplements are a dosing decision, not a guess
Fluoride supplements are prescribed against the measured level in your drinking water and the person’s age. Jefferson City households now have a real number to work from — 0.26 mg/L average — which is exactly the input a dentist or pediatrician uses. Bring it to the conversation; don’t self-prescribe off the “fluoridated” label in either direction.
On a private well in the Jefferson City area?
Well water is not fluoridated — test it before assuming anything
None of this page’s numbers apply to a private well. No utility fluoridates, monitors, or reports on well water: the city code, the CDC records, and the 2025 measurements all describe Jefferson City’s public supply only. Natural fluoride in groundwater varies widely — some wells have almost none, some land near the recommended level, and a few naturally run high.
So the order of operations matters: have the water tested by a certified laboratory first (your county health department can point you to one), then take the result to your dentist or your child’s pediatrician. Supplements are considered only against a measured level — and testing is also the only way to catch the opposite problem, natural levels high enough to risk fluorosis. Never dose on a guess, in either direction.
How to confirm all of this yourself
Don’t take our word for it — every claim on this page traces to a document you can open. Here is the trail, in order.
- Read the law. Jefferson City’s municipal code, Title 18 §18-127 (“Fluoridation of water supply”), authorizes and directs the water department to fluoridate the supply. The full Title 18 code is published by MTAS: mtas.tennessee.edu — Jefferson City Title 18 (PDF).
- Read the measurements. Jefferson City does not post its own Consumer Confidence Report online — which is why its figures reach the public inside a purchasing district’s report. The Dandridge Water Management Facility’s 2025 CCR contains a “2025 City of Jefferson City Water Quality Data” table: fluoride 0.26 mg/L average, highest detected 0.48 mg/L, range 0.00–0.48 mg/L. Read the Dandridge 2025 CCR (PDF).
- Check the CDC. The CDC’s My Water’s Fluoride lookup tracks fluoridation status by water system, and CDC census records list Jefferson City as an adjusting (fluoridating) system since December 1966.
- Go deeper. For how fluoride works, what the recent studies actually found, fluorosis, and how Tennessee’s city-by-city decisions get made, see our complete fluoride guide. This page is the short, local version of that evidence.
Questions Jefferson City residents ask us
Yes — on paper and by law. Jefferson City’s municipal code (Title 18, §18-127, “Fluoridation of water supply”) authorizes and directs the water department to fluoridate the supply, and CDC census records show the city has adjusted its fluoride since December 1966. The catch is the measured level: Jefferson City’s 2025 data averages 0.26 mg/L — fluoridated in policy, but well below the CDC’s recommended 0.7 mg/L in practice.
We can only report what the documents show. The city code directs fluoridation; the measurements in Jefferson City’s 2025 data table show an average of 0.26 mg/L, a highest detected level of 0.48 mg/L, and individual samples ranging down to 0.00 mg/L. Why the measured level runs below the target is an operations question the published record doesn’t answer — the utility is the place to ask. What we won’t do is round 0.26 up to “about 0.7.” It isn’t.
Yes. New Market Utility District and Shady Grove Utility District buy finished water from Jefferson City rather than treating their own, so their fluoridation status follows Jefferson City’s: fluoridated by policy, measured at a 0.26 mg/L average in 2025. (Dandridge also buys some Jefferson City water, but blends it with other suppliers, so Dandridge’s delivered water has its own numbers.)
Yes — and here more than in most “fluoridated” towns. Fluoride toothpaste is recommended whether or not your water is fluoridated, because it puts fluoride directly on the teeth where cavities start. At a measured average of 0.26 mg/L, Jefferson City’s water contributes only modest background exposure — nowhere near the 0.7 mg/L level at which the water itself does the heavy lifting. Brush twice a day with fluoride toothpaste; don’t let the “fluoridated” label talk you out of it.
Per the American Dental Association: for children under 3, a smear of fluoride toothpaste about the size of a grain of rice; from age 3 up, a pea-size amount. Supervise brushing, teach your child to spit the toothpaste out rather than swallow it, and keep the tube out of reach between brushings. The amounts are small on purpose — young children swallow much of what goes in their mouths, and the dosing accounts for that.
By every federal benchmark, Jefferson City’s measured level sits on the low side, not the high side. The EPA’s enforceable maximum contaminant level (MCL) is 4.0 mg/L and its secondary (non-enforceable) standard is 2.0 mg/L; Jefferson City’s highest detected sample in 2025 was 0.48 mg/L — far below both. The open question at 0.26 mg/L isn’t too much fluoride; it’s whether the water delivers the cavity-prevention benefit the city’s fluoridation policy intends.
It’s worth asking — especially for kids and for adults at higher risk of cavities. Varnish is a concentrated fluoride coating painted on at the dental office, and its value doesn’t depend on what’s in your tap water. Because Jefferson City’s measured level runs well below the CDC target, varnish carries more weight here than the word “fluoridated” on its own would suggest. Your dentist can judge your actual risk; the water numbers just say not to assume the tap has it covered.
No. No utility fluoridates, tests, or reports on private well water — the city code and the 2025 measurements describe Jefferson City’s public supply only. Natural fluoride in well water varies: some wells have almost none, and a few run naturally high. Have your well water tested by a certified laboratory, then take the result to your dentist before considering supplements for anyone in the household. Never dose on a guess, in either direction.
Sources & method
- City of Jefferson City, TN — Municipal Code, Title 18 §18-127, “Fluoridation of water supply” (MTAS codes library): the water department “is authorized and directed” to plan fluoridation and add fluoride to the water supply, https://www.mtas.tennessee.edu/index.php/system/files/codes/jeffersoncity_t18.pdf.
- Dandridge Water Management Facility — Water Quality Report for 2025 (Consumer Confidence Report), “2025 City of Jefferson City Water Quality Data” table: fluoride — no violation; 0.26 mg/L average; highest detected 0.48 mg/L; range of detections 0.00–0.48 mg/L; sampled 2025. Jefferson City publishes no CCR of its own online; Dandridge purchases water from Jefferson City and republishes its suppliers’ data tables, https://dandridgewater.com/download/ccr-latest-dandridge-tennessee/?wpdmdl=9082&masterkey=OWN3yM9ujIegc6FItTg4ezHgHS9uG7wcWqN-86MrOsN14phZZwj6wpTk0GRuY6LGgx4HQb-dehyEOgqSWYEVN8jOqd9gMilNNg-ooimAuIZw.
- CDC Fluoridation Census (Tennessee section) — Jefferson City (TN0000328) listed as ADJ (adjusted fluoridation) since December 1966; New Market Utility District and Shady Grove Utility District listed as consecutive (purchased-water) systems under Jefferson City, fluoridealert.org/wp-content/uploads/tennessee_census.pdf.
- CDC My Water’s Fluoride — the CDC’s system-by-system fluoridation lookup, nccd.cdc.gov/DOH_MWF.
- CDC / U.S. Public Health Service — recommended fluoride level for community water systems, 0.7 mg/L (2015).
- U.S. EPA — fluoride maximum contaminant level 4.0 mg/L (enforceable) and secondary standard 2.0 mg/L (non-enforceable), epa.gov secondary drinking water standards.
- American Dental Association — children’s toothpaste amounts (smear / grain of rice under age 3; pea-size from age 3), fluoride toothpaste and varnish guidance.
- Tennessee Water Authority — Jefferson City water quality guide: utility identity, population served (~9,764), source water (Mossy Creek Spring, Jarnigan Mine groundwater), and the purchased-water relationships with New Market and Shady Grove.
Method in one line: a city’s fluoridation status goes on this site only when the utility’s own documents or the CDC state it — here the status comes from Jefferson City’s own municipal code, and the level from Jefferson City’s own data table, republished in a purchasing district’s CCR because the city posts no CCR of its own. Accessed October 20, 2026.