Fluoride in Franklin, TN
Five utilities serve Franklin addresses, and they do not all deliver the same water. The city’s own plant runs at the CDC target; the wholesale system behind four of the five utilities runs below it.
Franklin’s water is fluoridated — at two different levels. The Franklin Water Department’s own plant reported 0.71 mg/L (2024), essentially at the CDC 0.7 mg/L target. Water supplied by Harpeth Valley Utility District — behind four of Franklin’s five utilities — averaged 0.53 mg/L, below the CDC recommended level. Both are far below EPA limits.
How this page works: the levels below come from each treating utility’s own published water quality report, presented by supply chain — the city plant’s water versus HVUD-supplied water — not from a marketing claim or a guess. New to the topic? Start with our full fluoride guide.
Water quality in Franklin
Curious about your tap water? Tennessee Water Authority has the full Franklin water quality guide — contaminant data, utility details, and filter recommendations.
Franklin’s fluoride, by utility
Everything on this page traces back to these facts, from each utility’s own published water quality report.
LEVEL Franklin Water Dept. — own plant
0.71 mg/L
2024 Water Quality Report (annual sample, Jan 2024; range 0.71–0.71 mg/L). Corroboration: 2023 report 0.74 mg/L. Essentially at the CDC 0.7 mg/L target. The department also blends purchased HVUD water.
LEVEL HVUD-supplied water
0.53 mg/L average
Range 0.25–0.65 mg/L, HVUD 2025/26 report. Below the CDC recommended 0.7 mg/L — stated plainly. This is the water HVUD delivers to its own customers and to the three purchasing districts below.
STATUS Fluoridated — adjusted, both systems
Both treating systems add fluoride. The Franklin report lists the source as “Water additive which promotes strong teeth.”
UTILITY Five utilities serve Franklin
Franklin Water Dept. (TN0000246, ~77,411 served) · Harpeth Valley UD (TN0000286, ~64,359) · H.B. & T.S. UD (TN0000699, ~37,803) · Mallory Valley UD (TN0000428, ~27,656) · Milcrofton UD (TN0000247, ~33,605). The last three buy treated water from HVUD.
SOURCE Two rivers
Franklin’s own plant treats Harpeth River water. HVUD treats Cumberland River water at its own plant.
How Franklin’s levels compare
Franklin has two verified levels, not one — so the table carries both, next to the three benchmarks that matter, each labeled for exactly what it is.
| Benchmark | Level | How Franklin compares |
|---|---|---|
| Franklin Water Dept. (own plant), 2024 | 0.71 mg/L | Annual sample, Jan 2024. Essentially at the CDC target. |
| HVUD-supplied water, 2025/26 | 0.53 mg/L avg | Range 0.25–0.65 mg/L. Below the CDC recommended level — we won’t round it up to the target. |
| CDC recommended level | 0.7 mg/L | Franklin’s own plant meets it; HVUD water runs below it, at roughly three-quarters. |
| EPA secondary (non-enforceable) standard | 2.0 mg/L | Both Franklin levels are far below this guideline, which is aimed at preventing cosmetic effects like tooth discoloration. |
| EPA enforceable maximum contaminant level (MCL) | 4.0 mg/L | Both levels are far below the legal limit. |
Four of Franklin’s five utilities deliver HVUD water, so most Franklin-area taps on purchased systems run at HVUD’s below-target 0.53 mg/L average — not at the city plant’s 0.71 mg/L.
Franklin is not one water system
Which level is yours depends on your supply chain: the Franklin Water Department’s own Harpeth River plant (0.71 mg/L), or HVUD’s Cumberland River plant (0.53 mg/L average) — delivered directly by HVUD or through H.B. & T.S., Mallory Valley, or Milcrofton. Check your water bill for your utility’s name before assuming either number is your number.
Do you still need fluoride toothpaste?
Yes — and this is the point people most often get backwards.
Fluoridated drinking water is background exposure. Every glass of water bathes your teeth in a low level of fluoride, and that steady, low-level contact genuinely helps enamel resist acid. But it is a base layer, not the main event. Fluoride toothpaste delivers a much more concentrated dose directly onto the enamel, twice a day, right where decay starts.
That holds on both Franklin systems — at the city plant’s 0.71 mg/L and at HVUD’s below-target 0.53 mg/L alike: brush twice daily with fluoride toothpaste. If you have been skipping fluoride toothpaste because “it’s in the water anyway,” the water was never carrying that load on its own.
Fluoride and kids: the amounts matter
Young children swallow toothpaste, so the ADA’s guidance is about using the right small amount — not about avoiding fluoride toothpaste.
UNDER 3 A rice-grain smear
For children under age 3, use a smear of fluoride toothpaste about the size of a grain of rice. That tiny amount is deliberate — it protects the teeth while keeping what gets swallowed to a minimum.
AGES 3+ A pea-size amount
From age 3 up, a pea-size amount is enough. A ribbon of paste running the length of the brush is several times more than a child needs.
- Supervise brushing. An adult should be watching (and helping) until a child can reliably spit and rinse on their own.
- Teach spitting, not swallowing. Spit the toothpaste out when done; swallowing it as a habit is what the small amounts are designed to guard against.
- Don’t load the brush. More paste does not mean cleaner teeth — it mostly means more swallowed.
What about fluoride varnish at the dentist?
An in-office fluoride treatment or varnish is a much stronger, targeted dose than anything in tap water or toothpaste.
If your Franklin water comes from HVUD at 0.53 mg/L — below the CDC recommended level — varnish remains worthwhile for kids and for adults at higher cavity risk: people with recent cavities, dry mouth, braces, or exposed tooth roots. The water gives you a partial base layer, and varnish tops it up exactly where a clinician can see it’s needed.
If your cavity risk is low, it’s also reasonable to ask your dentist to walk you through your risk before a treatment — in either direction, the decision should be explained, not automatic.
On a private well? None of this applies automatically
Well water is not fluoridated by any utility
Nobody adjusts the fluoride in a private well — or tests it, unless you do. Well water may carry naturally occurring fluoride, almost none, or more than you’d expect, and taste won’t tell you. This matters in Williamson County, where a home can be minutes from a city main and not connected to it. Test your well water before assuming what’s in it, and tell your dentist you’re on well water so your fluoride plan is built on your actual water, not the city’s.
How to confirm Franklin’s level yourself
Don’t take our word for it — the primary sources are public.
- Read your utility’s current water quality report. The Franklin Water Department 2024 report (PDF) lists fluoride at 0.71 mg/L; HVUD’s 2025/26 report lists its average at 0.53 mg/L (range 0.25–0.65 mg/L). A new report comes out each year; the newest one is the one to trust.
- Check CDC’s My Water’s Fluoride. The CDC’s system-by-system tracker at nccd.cdc.gov/DOH_MWF lists fluoridation status and levels for community water systems, including Franklin Water Department (TN0000246) and HVUD (TN0000286).
- Check whose name is on your bill. If your bill names H.B. & T.S., Mallory Valley, or Milcrofton, your water is HVUD water — HVUD’s 0.53 mg/L average governs your tap, not the city plant’s 0.71 mg/L.
For the bigger picture — how fluoridation works, the arguments on both sides, and how to think about filters — see our full fluoride guide.
Questions people actually ask
Asked the way people actually ask them — answered from the sources cited below.
Yes — but Franklin is not one water system. Five utilities serve Franklin addresses, and two of them treat the water. The Franklin Water Department's own Harpeth River plant reported 0.71 mg/L in its 2024 water quality report. Harpeth Valley Utility District (HVUD) water — which also supplies H.B. & T.S., Mallory Valley, and Milcrofton — averaged 0.53 mg/L. Both treating systems add fluoride; the level at your tap depends on which system serves you.
It depends on your utility. Franklin Water Department customers on the city's own plant water get about 0.71 mg/L (2024 report), essentially at the CDC recommended 0.7 mg/L. Anyone whose water comes from HVUD — HVUD's own customers plus the H.B. & T.S., Mallory Valley, and Milcrofton districts that buy HVUD water — gets an average of 0.53 mg/L, with a range of 0.25–0.65 mg/L. The Franklin Water Department also blends purchased HVUD water, so some city customers receive HVUD water at HVUD's level.
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.
Probably not. The 0.71 mg/L figure is the Franklin Water Department's own plant. If your bill names Harpeth Valley Utility District, H.B. & T.S. Utility District, Mallory Valley Utility District, or Milcrofton Utility District, your water is HVUD-treated water, which averaged 0.53 mg/L (range 0.25–0.65 mg/L). Check whose name is on your water bill — that utility's report is the one that governs your tap.
Yes. Fluoridated drinking water is background exposure — it bathes your teeth in a low level of fluoride through the day, which helps, but it does not replace the concentrated fluoride that toothpaste delivers directly to the enamel while you brush. Brush twice a day with fluoride toothpaste, and treat the water as a helpful base layer, not the whole defense.
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 — especially if your water comes from HVUD at 0.53 mg/L, below the CDC recommended level. 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 rather than accepting or skipping it on autopilot.
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 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 Franklin Water Department's 2024 report and HVUD's 2025/26 report are linked in the sources below, and each lists fluoride with its level and range. You can also check CDC's My Water's Fluoride, which tracks fluoridation status and levels by water system. If your bill names a purchasing district, its water is HVUD water, so HVUD's report is the one that governs your tap.
Sources & method
- City of Franklin Water Plant, Water Quality Report 2024 — fluoride 0.71 mg/L (annual sample, Jan 2024), source “Water additive which promotes strong teeth”; system TN0000246; tapwaterinfo.com/2024/franklin.pdf.
- City of Franklin Water Plant, Water Quality Report 2023 — corroborating fluoride level of 0.74 mg/L; tapwaterinfo.com/2023/franklin.pdf.
- Harpeth Valley Utility District, CCR 2025/26 — fluoride 0.53 mg/L average, range 0.25–0.65 mg/L; system TN0000286 (figure as transcribed in the Tennessee Water Authority Franklin and Nashville guides’ verified CCR sections).
- Tennessee Water Authority, Franklin water quality guide — five-utility structure, PWSIDs, purchasing relationships, and served populations; tennesseewaterauthority.com/franklin-tn-water-quality-guide.
- CDC — recommended fluoride level of 0.7 mg/L for community water systems; fluoridation status and levels are also tracked in CDC’s My Water’s Fluoride.
- EPA — enforceable maximum contaminant level (MCL) of 4.0 mg/L and secondary (non-enforceable) standard of 2.0 mg/L for fluoride in drinking water.
- American Dental Association (ADA) — children’s toothpaste amounts: a rice-grain smear under age 3, a pea-size amount at ages 3 and up, with supervised brushing.
Method in one line: Franklin’s levels come from the two treating utilities’ own published reports — the city plant’s 2024 report and HVUD’s 2025/26 report — presented by supply chain, because the purchasing districts inherit HVUD’s verified level. We never name, rank, or recommend private dental practices.