Fluoride in Nashville, TN
Three utilities serve Nashville addresses, all treating Cumberland River water independently. Two run close to the CDC target; one runs plainly below it.
Nashville’s water is fluoridated — on all three systems. Metro Water Services, the primary system, reported 0.67 mg/L and Madison Suburban 0.65 mg/L, both close to the CDC 0.7 mg/L target. Harpeth Valley averaged 0.53 mg/L, below the CDC recommended level. All three are far below EPA limits.
How this page works: the levels below come from each utility’s own published water quality report, presented per utility and led by Metro Water Services, the primary system — not from a marketing claim or a guess. New to the topic? Start with our full fluoride guide.
Water quality in Nashville
Curious about your tap water? Tennessee Water Authority has the full Nashville water quality guide — contaminant data, utility details, and filter recommendations.
Nashville’s fluoride, by utility
Everything on this page traces back to these facts, from each utility’s own published water quality report.
LEVEL MWS — primary system
0.67 mg/L
Range 0.56–0.75 mg/L, 2025 report. Essentially at the CDC 0.7 mg/L target. Serves most of Davidson County.
LEVEL MSUD — Madison / north Davidson
0.65 mg/L
Range 0.56–0.70 mg/L, 2025 report (2024 data). Close to the CDC target.
LEVEL HVUD — southwest Nashville / Bellevue
0.53 mg/L average
Range 0.25–0.65 mg/L, 2025/26 report. Below the CDC recommended 0.7 mg/L — stated plainly.
STATUS Fluoridated — adjusted, all three systems
All three systems’ reports use “water additive” fluoride source language, consistent with adjustment on all three.
UTILITY Three utilities serve Nashville
Metro Water Services (TN0000494, ~755,890 served) · Harpeth Valley UD (TN0000286, ~64,359) · Madison Suburban UD (TN0000424, ~78,133).
SOURCE Cumberland River, three plants
All three draw from the Cumberland River — MWS at its K.R. Harrington and Omohundro plants, HVUD at Cheatham Lake, MSUD from Cheatham Reservoir — but each treats independently.
How Nashville’s levels compare
Three systems, three verified levels — all clustered around the CDC target, one plainly below it. Here is each next to the three benchmarks that matter, each labeled for exactly what it is.
| Benchmark | Level | How Nashville compares |
|---|---|---|
| MWS, 2025 | 0.67 mg/L | Range 0.56–0.75 mg/L. Essentially at the CDC target; serves most of Davidson County. |
| MSUD, 2025 (2024 data) | 0.65 mg/L | Range 0.56–0.70 mg/L. Close to the CDC target. |
| HVUD, 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 | MWS and MSUD run just below it; HVUD runs at roughly three-quarters of it. |
| EPA secondary (non-enforceable) standard | 2.0 mg/L | All three Nashville 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 | All three levels are far below the legal limit. |
All three figures come from the utilities’ own reports, as transcribed in the Tennessee Water Authority Nashville guide’s verified CCR sections. The guide’s EWG sections carry no fluoride figure for these systems, so there is no EWG number to agree or disagree with here.
Davidson County is not one water system
MWS’s 0.67 mg/L describes Metro Water customers — most of the county, but not all of it. Southwest Nashville and Bellevue sit on HVUD (0.53 mg/L average), and Madison and northern Davidson County sit on MSUD (0.65 mg/L). All three treat Cumberland River water independently, so check your water bill for your utility’s name before assuming any one 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.
So on all three Nashville systems — at MWS’s 0.67 mg/L, MSUD’s 0.65 mg/L, and 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 Nashville 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. On MWS and MSUD water, both close to target, the same risk-based logic applies.
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 on Davidson County’s edges, where a home can be minutes from a Metro 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 Nashville’s level yourself
Don’t take our word for it — the primary sources are public.
- Read your utility’s current water quality report. MWS’s 2025 report lists fluoride at 0.67 mg/L (range 0.56–0.75); HVUD’s 2025/26 report lists 0.53 mg/L (range 0.25–0.65); MSUD’s 2025 report (2024 data) lists 0.65 mg/L (range 0.56–0.70) — all as transcribed in the Tennessee Water Authority Nashville guide’s verified CCR sections. 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 MWS (TN0000494), HVUD (TN0000286), and MSUD (TN0000424).
- Check whose name is on your bill. If your bill names HVUD or MSUD instead of Metro Water Services, that district’s level governs your tap — not this page’s lead 0.67 mg/L figure.
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 — all three systems that serve Nashville addresses add fluoride. Nashville Metro Water Services (MWS), the primary system, reported 0.67 mg/L in its 2025 report. Madison Suburban Utility District (MSUD) reported 0.65 mg/L. Harpeth Valley Utility District (HVUD), serving southwest Nashville and Bellevue, averaged 0.53 mg/L — below the CDC recommended level. Which level is yours depends on which system serves your address.
Most Nashville addresses are on MWS, at 0.67 mg/L (range 0.56–0.75 mg/L, 2025 report) — essentially at the CDC recommended 0.7 mg/L. MSUD customers in Madison and northern Davidson County get 0.65 mg/L (range 0.56–0.70 mg/L). HVUD customers in southwest Nashville and Bellevue get an average of 0.53 mg/L (range 0.25–0.65 mg/L), below the recommended 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. That figure is HVUD's; MWS (0.67 mg/L) and MSUD (0.65 mg/L) both run close to the target. All three levels are 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.
No — not necessarily. Nashville is not one water system. If your bill names Harpeth Valley Utility District, your average is 0.53 mg/L; if it names Madison Suburban Utility District, your level is 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 on HVUD water 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 Davidson 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 — MWS's 2025 report, HVUD's 2025/26 report, and MSUD's 2025 report (2024 data) are the sources for the figures 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 utility district instead of Metro Water Services, that district's report governs your tap.
Sources & method
- Nashville Metro Water Services, CCR 2025 — fluoride 0.67 mg/L, range 0.56–0.75 mg/L; system TN0000494 (as transcribed in the Tennessee Water Authority Nashville guide’s verified CCR section).
- Harpeth Valley Utility District, CCR 2025/26 — fluoride 0.53 mg/L, range 0.25–0.65 mg/L; system TN0000286 (as transcribed in the same guide).
- Madison Suburban Utility District, Annual CCR 2025 (2024 data) — fluoride 0.65 mg/L, range 0.56–0.70 mg/L; system TN0000424 (as transcribed in the same guide).
- Tennessee Water Authority, Nashville water quality guide — utility identification, PWSIDs, served populations, and the verified CCR transcriptions above; tennesseewaterauthority.com/nashville-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: Nashville’s levels come from the three utilities’ own published reports, as transcribed in the Tennessee Water Authority Nashville guide’s verified CCR sections, and are presented per utility with Metro Water Services first. We never name, rank, or recommend private dental practices.