Fluoride in Collierville’s water: 0.838 mg/L, just above the CDC target
Collierville’s fluoridation status, the measured level and where that figure actually comes from, and what a modestly above-target level does — and doesn’t — change about toothpaste, kids’ brushing, and treatments at the dentist.
Collierville’s water is fluoridated — adjusted fluoridation since 1974 — at 0.838 mg/L, a bit above the CDC’s 0.7 target. That is modestly above the recommended level and still far below every EPA limit: less than half the 2.0 mg/L secondary standard and about a fifth of the 4.0 mg/L legal maximum.
Water quality in Collierville
Curious about your tap water? Tennessee Water Authority has the full Collierville water quality guide — contaminant data, utility details, and filter recommendations.
Where the number comes from — stated plainly: Collierville’s own CCR PDF could not be located online. The 0.838 mg/L figure comes from the neighboring Piperton Water System’s 2025 CCR: Piperton buys its water from Collierville and republishes Collierville’s data, and its other figures match Collierville’s own published 2025 numbers exactly. More on that in Confirm it yourself.
Collierville’s level, next to the benchmarks that matter
Three different numbers get mixed up in every fluoride argument. Collierville’s measured level is the first row; the other three are the federal benchmarks it should be judged against — a recommendation, a cosmetic guideline, and a legal ceiling. They are not interchangeable.
| What | Level | What it means |
|---|---|---|
| Collierville Water DepartmentSampled October 2025 — measured range 0.699–0.994 mg/L; figure via Piperton’s 2025 CCR, which republishes Collierville’s data | 0.838 mg/L | The reported level in Collierville’s water. The system draws Memphis aquifer groundwater and adjusts its fluoride — classified as adjusted fluoridation since February 1974, using sodium fluoride. The town tests for fluoride daily, and its 2025 report lists fluoride’s source solely as a “water additive.” At 0.838 mg/L it runs modestly above the CDC’s 0.7 mg/L recommendation. |
| 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. Collierville runs a bit above it. |
| EPA secondary standard (SMCL)EPA — not federally enforceable | 2.0 mg/L | A guideline aimed at preventing tooth discoloration (fluorosis). Systems above it must notify the public, but it is a cosmetic-effects standard, not a health-based limit. Collierville is well under it. |
| EPA maximum contaminant level (MCL)EPA — enforceable | 4.0 mg/L | The legal ceiling for fluoride in public drinking water, set to protect against bone disease and severe tooth damage. Collierville is at about a fifth of it. |
Sources: Piperton Water System, 2025 Consumer Confidence Report (republishing Collierville Water Department data); CDC Fluoridation Census and community water fluoridation recommendation; EPA secondary drinking water standards and fluoride MCL.
Above the target is not the same as over a limit
Read the table in the right direction. The CDC’s 0.7 mg/L is a target — the level judged to balance cavity prevention against fluorosis risk. Collierville’s 0.838 mg/L sits modestly above that target, which mainly matters for total intake in young children (see the kids’ section below). On the safety side of the scale, 0.838 mg/L is far below both the 2.0 mg/L secondary standard and the 4.0 mg/L enforceable maximum. Above-target and over-limit are different claims, and only the first one is true here.
Not the same system as Memphis — check your bill
Collierville is not on Memphis Light, Gas and Water. MLGW is a separate neighboring system with its own fluoridation program and its own level, and its figures are not Collierville’s. If your water bill names the Collierville Water Department, the figures on this page are yours. If it names a different system, look that system up separately — starting with the name on the bill.
Is Collierville planning to stop fluoridating?
In 2025 Collierville’s town board discussed fluoride at a work session; there was no indication of an immediate plan to remove it. Fluoridation in Collierville dates to February 1974 and, as of the town’s 2025 reporting, remains in place with daily testing.
What a modestly above-target level means for your routine
Collierville’s water already carries slightly more fluoride than the CDC aims for. That does not retire your toothpaste — but it does make the amounts, especially for kids, worth getting right.
01 You still need fluoride toothpaste, twice a day
Think of it as two different jobs. The water is background exposure — a low level of fluoride in your mouth all day, every time you take a sip. Toothpaste is the concentrated dose, applied directly to your teeth while you brush.
The ADA recommends fluoride toothpaste twice daily for everyone, including in communities fluoridated at or above the recommended level. The water alone is not a substitute for brushing — it never was, at any level.
02 Kids: the amount matters more here
Per the ADA, start fluoride toothpaste when the first tooth comes in — the dose, not the ingredient, is what changes with age:
Under age 3: a smear the size of a grain of rice.
Age 3 and up: a pea-size amount.
Brush twice a day, teach them to spit and not swallow, and supervise — an adult should be the one loading the brush. At an above-target water level, total intake is what counts, so don’t add fluoride supplements on top unless a dentist or doctor specifically advises them.
03 In-office varnish: still useful if you’re cavity-prone
An in-office fluoride varnish remains a reasonable conversation at checkups for people at higher cavity risk — kids with a pattern of new cavities, braces trapping plaque against enamel, dry mouth (a side effect of many common medications), exposed roots from gum recession, or frequent decay.
It isn’t automatic for everyone. If you’re low-risk with no cavities in years, ask which risk factor the treatment is aimed at — a good answer names a specific one.
04 Supplements: don’t add them here
Fluoride supplements (tablets or drops) are meant for children whose drinking water is low in fluoride. Collierville’s water is not low — it runs above the CDC target — so supplements would stack intake on top of an already sufficient source.
Only on a dentist’s or doctor’s advice — and in Collierville, expect that advice to usually be no. If a supplement is ever suggested, bring your water level to that conversation.
For how fluoride works, what the recent research actually found, fluorosis, and the fluoride-free toothpaste question, read our full guide — it keeps the evidence and its limits separate, the same way this page does. Read the full fluoride guide →
On a private well outside the town system?
Well water is unregulated — test first
If your home is on a private well, none of the numbers above apply to you. No utility adjusts your water, tests it, or reports on it. Natural fluoride in well water varies widely — some wells have almost none, some land near the recommended level, and a few naturally run high.
Have your water tested by a certified laboratory first (your county health department can point you to one). Then take the result to your child’s dentist or pediatrician: fluoride supplements are recommended only when the water is low, in a dose matched to the measured level and your child’s age — and only on professional advice. Never start supplements on a guess; testing is also the only way to catch the opposite problem, a natural level high enough to risk fluorosis while teeth are forming.
Confirm it yourself
Don’t take our word for it — including this page’s. Here are the primary sources behind every figure above, including the honest wrinkle in how Collierville’s figure reaches print:
- Piperton’s 2025 Consumer Confidence Report. The Piperton Water System’s 2025 CCR is the published source for the 0.838 mg/L figure and the 0.699–0.994 mg/L range (sampled October 2025). Piperton buys its water from Collierville and republishes Collierville’s data — and its other figures match Collierville’s own published 2025 numbers exactly. We use it because Collierville’s own CCR PDF could not be located online.
- Ask the Collierville Water Department for its own current CCR. Every community water system must produce a Consumer Confidence Report annually. The department’s own report (system TN0000126) is the authoritative document — if you obtain a copy or a newer edition is posted, its numbers supersede the republished ones here.
- CDC’s My Water’s Fluoride. Look Collierville up in the CDC’s My Water’s Fluoride database, built on state-reported data. It confirms the adjusted-fluoridation classification dating to February 1974. It isn’t real-time, so if it ever disagrees with a fresh CCR, trust the CCR.
Questions Collierville readers actually ask
Yes. Collierville has adjusted fluoridation — the CDC Fluoridation Census classifies it as adjusted since February 1974, using sodium fluoride. The town’s 2025 report lists fluoride’s source solely as a water additive, and the Collierville Water Department (TN0000126) tests for fluoride daily. The water comes from the Memphis aquifer.
0.838 mg/L, with a measured range of 0.699–0.994 mg/L, sampled in October 2025. That is modestly above the CDC’s recommended level of 0.7 mg/L — and still far below the EPA secondary standard of 2.0 mg/L and the enforceable maximum of 4.0 mg/L.
Because we could not locate Collierville’s own CCR PDF online. The neighboring Piperton Water System buys its water from Collierville and republishes Collierville’s data in its 2025 CCR — and Piperton’s other figures match Collierville’s own published 2025 numbers exactly. That is why we use Piperton’s report for the fluoride figure, and why we say so plainly on this page.
Yes. Fluoridated water is background exposure — a low level in your mouth through the day. Fluoride toothpaste is the concentrated dose applied directly to your teeth, and the ADA recommends brushing with it twice a day even where water is fluoridated at or above the recommended level.
Per the ADA: a smear the size of a grain of rice from the first tooth until age 3, then a pea-size amount from age 3 on. Brush twice a day, teach kids to spit and not swallow, and supervise brushing. Because Collierville’s water runs a bit above the CDC target, total intake matters — do not add fluoride supplements unless a dentist or doctor advises them.
Almost certainly not by anyone — private wells are unregulated, and no utility adjusts or reports their fluoride. Natural levels vary, so have your water tested by a certified lab before considering fluoride supplements for your kids, and let their dentist or pediatrician decide based on the actual result. Supplements should only be used on a dentist’s or doctor’s advice.
Sources & method
- Piperton Water System — 2025 Consumer Confidence Report: fluoride 0.838 mg/L, range 0.699–0.994 mg/L, sampled October 2025. Piperton purchases its water from Collierville and republishes Collierville Water Department data; its other figures match Collierville’s own published 2025 numbers exactly. Collierville’s own CCR PDF could not be located online — that gap is disclosed, not papered over.
- Town of Collierville / Collierville Water Department (TN0000126) — 2025 reporting: fluoride’s source listed solely as a “water additive”; fluoride tested daily; Memphis aquifer groundwater source.
- CDC — Fluoridation Census classification: Collierville adjusted fluoridation since February 1974 (sodium fluoride); community water fluoridation recommended level, 0.7 mg/L; My Water’s Fluoride system lookup.
- U.S. EPA — fluoride maximum contaminant level (MCL) 4.0 mg/L (enforceable) and secondary standard (SMCL) 2.0 mg/L (non-enforceable guideline for tooth discoloration).
- American Dental Association — children’s fluoride toothpaste amounts (rice-grain smear under age 3, pea-size from age 3) and the recommendation for fluoride toothpaste alongside fluoridated water.
Method in one line: every figure on this page comes from the reports and federal benchmarks cited above — nothing estimated, nothing rounded into a claim it isn’t. Where Collierville’s own document could not be located, we say so and show the republished source instead. Collierville Water Department and Memphis Light, Gas and Water are separate systems, and their figures are never mixed on this page.
Want the full picture — how fluoride works, the research debate, fluorosis, and fluoride-free alternatives? Read the complete fluoride guide.