The science
Proof, not promises.
We don't ask you to take our word for it. Sentry H2O publishes independent lab testing for the systems Mountain Pure Water carries, and the real before-and-after numbers are below — including the one result that came in lower than the rest. Honest data is the whole point.
97.44–99.93%
PFAS reduction where both lab values were quantified — most compounds reached non-detect
0
detectable lead, arsenic or uranium left after under-sink treatment
6.8 → 8.2
pH — minerals added back, not stripped out (lab-tested 6.83 → 8.21)
Non-detect
vinyl chloride after treatment in the East Palestine stress test
Every figure from independent, EPA-certified laboratories — Tap Score / SimpleLab (Tempe AZ, 2024–2025) and Summit Environmental Technologies (East Palestine OH, 2023) — published by Sentry H2O. Independent testing, not an EPA-run test.
Daybreak-area evidence
Owner-identified before-and-after samples
The owner identified these two SimpleLab samples as Daybreak-area city water collected before treatment and after Sentry H2O treatment. They are separate from the Tempe dataset below. The pre-treatment sample was collected February 20, 2026; the post-treatment report does not state a collection date. They are not a same-day controlled trial, so the table reports exact values without inventing reduction percentages.
Arsenic & lead
Not detected after treatment
Pre-treatment arsenic was above SimpleLab's non-enforceable Health Guidance Level
Different dates
So we show raw values, not a made-up percentage
Honesty rule: never invent a reduction from uncontrolled samples
* Estimated value below the reporting limit. † Report 2C4J74 uses PPM; in water, PPM is approximately equivalent to mg/L. Tested by Microbac Laboratories, an independent EPA-certified laboratory. Each full report lists that sample's testing facility, EPA analytical methods, laboratory IDs, and accreditation scope per analyte. Read the privacy-redacted owner-identified pre-treatment report and owner-identified post-treatment report.
Legal isn't the same as safe
400×+
Salt Lake City's water passes every legal test — and one PFAS "forever chemical" still measures over 400 times the health guideline.
SLC tap water passes every legal test. But the legal limits were set on cost and feasibility — often decades ago. Here's how the city's own 2026 numbers compare to what independent health scientists say is actually safe.
| In SLC's water | Legal limit | Health guideline | Over the health limit |
|---|---|---|---|
| Chlorine byproducts (TTHMs)36.7 ppb | 80 ppb | 0.15 ppb | ~244x |
| Chlorine byproducts (HAA5)26.5 ppb | 60 ppb | 0.1 ppb | ~265x |
| Arsenic0.54 ppb | 10 ppb | 0.004 ppb | ~135x |
| Chromium-6 (the "Erin Brockovich" chemical)0.27-0.73 ppb | no federal limit | 0.02 ppb | ~25x |
| PFAS "forever chemical" (PFHxS)0.40 ppt | 10 ppt | 0.001 ppt | ~404x |
| Radium (radioactive)0.09-0.72 pCi/L | 5 pCi/L | 0.05 pCi/L | ~8x |
| Lead2.6 ppb | 15 ppb | 0.2 ppb | ~13x |
SLC also still has an estimated 9,400–14,500 lead service lines in the ground. The EPA's own non-enforceable health goal for arsenic, lead and these chlorine byproducts is zero — an admission that the legal number isn't the safe number.
"Health guideline" = the level set purely on health science (EWG Tap Water Database / California OEHHA Public Health Goals — a 1-in-1,000,000 lifetime cancer-risk target), not a "harm starts here" line. Figures: Salt Lake City 2026 Consumer Confidence Report + EWG Tap Water Database (system UT2590020). Legal — not the same as safe.
How it actually works
See every stage that touches your water.
Multi-stage catalytic carbon — not reverse osmosis. It targets the bad stuff and leaves the good minerals in, with no electricity and no wasted water.
Stage 1 · catalytic carbon
ToxyGuard
Catalytic carbon and reduction media break down chlorine, chloramine, fluoride, lead and arsenic as water passes through. (The PFAS numbers below are measured for the system as a whole.)
Stage 2 · minerals back in
AlkaGuard
Re-mineralizes the water and raises pH slightly — the healthy minerals reverse osmosis strips out are kept in, for a cleaner, rounder taste.
Optional · wells (TriGuard)
BioChemGuard
Optional third stage for wells: a submicron barrier against bacteria, viruses and cysts, right at the tap.
Forever chemicals
Does it remove PFAS?
In the Tempe, AZ city-water report, most PFAS compounds reached non-detect after the under-sink Sentry H2O Wellness System. Where both before and after results were quantified, reductions were 97.44–99.93%.
After Sentry H2O In the tap 
The feeling is the hook — the numbers below are the proof. No claim lives on the image itself.
One honest note: on the larger whole-house system, four of the eight PFAS detected in the source water reached non-detect. PFOA fell 47.47%, leaving 52.53% of the measured concentration — the lowest figure in the dataset. We show it because a brand that hides its weakest number hasn't earned your trust.
Percentages use the reports' full-precision values and are rounded to two decimal places.
Heavy metals & inorganics
Lead, arsenic, uranium and more
In the separate Tempe dataset, the untreated report detected arsenic, lead and uranium. Each was below federal enforceable thresholds but above SimpleLab's Health Guidance Level, a health-protective and non-enforceable benchmark. After the under-sink Sentry H2O system, all three were non-detectable.
The good stuff stays
It adds minerals back — it doesn't strip them
Reverse osmosis strips water down to nothing; Sentry H2O's AlkaGuard stage re-mineralizes and gently raises pH for a smoother taste.
pH (acidity)
6.83 → 8.21
Less acidic, smoother taste
Alkalinity
124 → 189
More buffering minerals
It's not just what you drink — it's what you cook with. Wellness researcher Dr. Josh Axe has written that cooking with demineralized water "like reverse osmosis water, you can lose up to 60 percent of magnesium or 70 percent of manganese in your food"[1] — a figure that traces back to the World Health Organization's own research on mineral loss from cooking in low-mineral water. AlkaGuard is designed to keep those minerals in the water you cook with, not just the water you drink.
A real-world stress test
Vinyl chloride, East Palestine
Non-detect
After the 2023 East Palestine, Ohio train derailment, a Sentry H2O Wellness System was tested by Summit Environmental Technologies against vinyl chloride — one of the chemicals released. Treated water tested non-detect for vinyl chloride.
Plain-language note: the lab also ran control samples where vinyl chloride was added after filtration to verify the instrument — those, by design, read high and don't reflect filter performance. The meaningful result is the treated, un-spiked sample: none detected.
What we haven't tested (yet)
Published lab reports currently cover the under-sink and whole-house systems on city water. The shower filter and portable products don't yet have their own published lab results, and we won't claim numbers we can't back up. The owner reports that Sentry H2O systems are tested to NSF standards; certification documentation is being finalized, so we do not call the systems NSF certified.
Results as reported by the testing labs (PFAS in µg/L; metals and minerals in mg/L; "not detected" = below the lab's detection limit). Tested by independent EPA-certified laboratories. Each full report lists that sample's testing facility, EPA analytical methods, laboratory IDs, and accreditation scope per analyte. Tap Score / SimpleLab, Daybreak area (2026) and Tempe AZ (2024-2025); Summit Environmental Technologies, East Palestine OH (May 2023). Source: Sentry H2O's report summary and linked full lab reports.
[1] Dr. Josh Axe, DC, CNS — "Is Reverse Osmosis Water Good for You? Or Does It Over-Filter?" draxe.com, November 1, 2023.
See which system fits your water
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Know your water
Know what is in your water before you choose a system.
Check the public data, test your tap, then match your home to the right Sentry H2O system.
Read your local water report
Your area's annual Consumer Confidence Report (CCR) lists what has been detected in your municipal tap water.
Salt Lake City? See what's really in your water →Check the EWG Tap Water Database
Enter your zip code for a plain-language breakdown of the contaminants found in your local supply.
Open the EWG database →Test your tap with an at-home kit
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