Fluoride in Hartsville, TN
Hartsville's water comes from one treating system on the Cumberland River, and its own reports show the fluoride level plainly — including how it has drifted down over four reports.
Hartsville’s water is fluoridated. The Hartsville/Trousdale Water & Sewer Utility District adjusts fluoride, and its 2025 report puts the average level at 0.58 mg/L (range 0.50–0.69 mg/L). That is below the CDC recommended level of 0.7 mg/L — and far below both EPA standards.
How this page works: the level below comes from the district’s own published water quality reports — four of them, so you can see the trend, not just the newest number. New to the topic? Start with our full fluoride guide.
Water quality in Hartsville
Curious about your tap water? Tennessee Water Authority has the full Hartsville water quality guide — contaminant data, utility details, and filter recommendations.
Hartsville’s fluoride, by utility
Everything on this page traces back to these facts, from each utility’s own published water quality report.
LEVEL Fluoride in Hartsville/Trousdale water
0.58 mg/L average
Range 0.50–0.69 mg/L across the year. Data year: 2025. Below the CDC recommended 0.7 mg/L — stated plainly. Corroboration: 2024 report 0.56 mg/L; 2023 report 0.658 mg/L.
STATUS Fluoridated — adjusted
The district adjusts fluoride as part of treatment — the report’s source language includes “water additive which promotes strong teeth.”
UTILITY Hartsville/Trousdale Water & Sewer UD
PWSID TN0000291. Serves about 7,400 people in Hartsville and Trousdale County. Trousdale County UD (~3,200) purchases this same treated water.
SOURCE Cumberland River
Surface water from the Cumberland River, treated by the district.
How 0.58 mg/L compares
A number by itself doesn’t tell you much. Here is Hartsville’s level next to the three benchmarks that matter, each labeled for exactly what it is.
| Benchmark | Level | How Hartsville compares |
|---|---|---|
| Hartsville/Trousdale average, 2025 | 0.58 mg/L | Range 0.50–0.69 mg/L across the year. |
| CDC recommended level | 0.7 mg/L | Hartsville runs below this — close, at roughly four-fifths of the recommendation. We won’t round it up to the target: 0.58 is 0.58. |
| EPA secondary (non-enforceable) standard | 2.0 mg/L | Hartsville is far below this. The secondary standard is a guideline aimed at preventing cosmetic effects like tooth discoloration. |
| EPA enforceable maximum contaminant level (MCL) | 4.0 mg/L | Hartsville is far below the legal limit. |
The district’s own reports show the trend honestly: 0.72 mg/L average in 2020 (range 0.50–0.90), then 0.658 in 2023, 0.56 in 2024, and 0.58 in 2025 — from just above the CDC target to below it. Castalian Springs-Bethpage UD, which buys Hartsville water, lists the Hartsville source at 0.58 ppm in its own 2025 report — an exact match.
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 even in a fluoridated town — and Hartsville is one, at 0.58 mg/L — 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.
At Hartsville’s 0.58 mg/L — close to the CDC recommended level, but below it — varnish remains worthwhile for kids and for adults at higher cavity risk: people with recent cavities, dry mouth, braces, or exposed tooth roots. That is not alarmism; it is just arithmetic. 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 Trousdale County, where a home can be minutes from a district 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 town’s.
How to confirm Hartsville’s level yourself
Don’t take our word for it — the primary sources are public.
- Read the district’s current water quality report. The Hartsville/Trousdale 2025 CCR (PDF) lists fluoride at 0.58 mg/L average (range 0.50–0.69). 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 Hartsville/Trousdale (TN0000291).
- Check whose name is on your bill. If your bill names Trousdale County UD, your water is purchased Hartsville/Trousdale water — the same treated water this page describes.
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. The Hartsville/Trousdale Water & Sewer Utility District adjusts the fluoride in the water it treats from the Cumberland River, and its 2025 water quality report puts the average level at 0.58 mg/L, with a range of 0.50–0.69 mg/L across the year.
About 0.58 mg/L on the most recent report (2025; range 0.50–0.69 mg/L). The district's recent reports tell a consistent story: 0.56 mg/L in 2024 and 0.658 mg/L in 2023 — all below the CDC recommended 0.7 mg/L. Its 2020 report averaged 0.72 mg/L, so the level has drifted down from just above the target to below it.
It is a bit low compared to the target, but not by much. The CDC recommended level is 0.7 mg/L, so Hartsville's 0.58 mg/L sits below it at roughly four-fifths of the recommendation. It is nowhere near the EPA limits — the enforceable maximum contaminant level (MCL) is 4.0 mg/L and the secondary (non-enforceable) standard is 2.0 mg/L. Brushing with fluoride toothpaste covers the rest of what your teeth need.
If your bill names Trousdale County Utility District, your water is purchased Hartsville/Trousdale water, so the same treated water — and the same fluoride level — applies; what differs is the district reselling it. If your bill names Castalian Springs-Bethpage, that district blends Hartsville water with Gallatin water (its 2025 report lists 0.58 ppm for the Hartsville source). Anyone else's report governs their own 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. Hartsville's water at 0.58 mg/L is close to but below the CDC recommended level, so the water alone is not the full story. 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 Trousdale 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 the district's current water quality report — the 2025 report is linked in the sources below, and fluoride is listed with its average and range. You can also check CDC's My Water's Fluoride, which tracks fluoridation status and levels by water system (Hartsville/Trousdale is TN0000291). A new report comes out each year; the newest one is the one to trust.
Sources & method
- Hartsville/Trousdale Water & Sewer UD, 2025 CCR — fluoride 0.58 mg/L average, range 0.50–0.69 mg/L; system TN0000291; trousdalecountytn.gov — 2025 CCR Water Report (PDF).
- Hartsville/Trousdale Water & Sewer UD, 2024 CCR — corroborating fluoride average of 0.56 mg/L, range 0.35–0.71 mg/L.
- Hartsville/Trousdale Water & Sewer UD, Water Quality Report 2023 — fluoride 0.658 mg/L average, range 0.20–0.80 mg/L; trousdalecountytn.gov — Water Quality Report 2023 (PDF).
- Tennessee Water Authority, Hartsville water quality guide — 2020 CCR transcription (fluoride 0.72 mg/L average, range 0.50–0.90) and utility structure; tennesseewaterauthority.com/hartsville-tn-water-quality-guide. Note: the guide’s table labels this system TN0000097; EPA records show that ID belongs to Castalian Springs-Bethpage UD, so this page uses TN0000291, the ID on EWG’s Hartsville-Trousdale system page.
- 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: Hartsville’s level comes from the district’s own published reports — the 2025 report as the headline, with 2023, 2024, and 2020 published alongside it so the trend is visible rather than cherry-picked. We never name, rank, or recommend private dental practices.