How do I handle a return, shipping damage or a warranty claim?

Contact Mountain Pure Water first at (435) 990-3778 with your order number and details of the issue; include photos for shipping damage. We coordinate the review and issue any return instructions, including the correct destination. Wait for our instructions before sending anything back. Shipping damage, including broken fittings, is reviewed case by case. See our Shipping, Returns & Refunds policy for the 30-day return window, restocking fees and warranty terms.

Free Ground shipping on every order, contiguous US. No minimum. Shipping is $10 to Alaska, Hawaii and Puerto Rico. We ship to US addresses only. See our Shipping, Returns & Refunds policy for details.

What is catalytic-carbon filtration, and how is it different from reverse osmosis?

Catalytic-carbon filtration uses specially processed activated carbon that reacts with and breaks down contaminants as water passes through multiple stages. Unlike reverse osmosis, our Sentry H2O systems don't strip the water of everything -- they target the bad stuff while leaving naturally occurring beneficial minerals in place. The non-RO city filtration stages produce no RO reject-water waste.

Does the system need electricity or produce wastewater?

Our non-RO city filtration stages run on water pressure and produce no RO reject-water waste. UV accessories require power. Well treatment may produce waste or backwash water; requirements depend on the selected configuration.

Does it change the taste or smell of the water?

Yes -- for the better. Chlorine and chloramine drive most of that tap-water taste and smell, and the ToxyGuard stage is built to reduce both. The AlkaGuard stage then adds back trace minerals for a cleaner, rounder flavor, without the flat aftertaste reverse osmosis can leave behind.

What about chlorine and chloramine from city water?

Both are specifically targeted by the ToxyGuard stage in every Sentry H2O system. Chloramine is notoriously hard to remove with standard carbon, which is exactly why we use catalytic carbon -- its enhanced reactivity breaks chloramine down more effectively, so your water smells and tastes clean straight from the tap.

Why choose a Sentry H2O system over a reverse osmosis filter?

RO systems waste water, need electricity and a drain line, and strip out healthy minerals (then sometimes add them back with a separate stage). Sentry H2O under-sink systems send no reject water to the drain, run on zero electricity, keep healthy minerals in place via AlkaGuard, and cost less upfront -- a cleaner fit for most homes worried about taste, chlorine, PFAS, lead and fluoride.

How much could I save by switching from bottled water?

A household that relies on bottled water can spend several hundred dollars a year on cases and delivery. The Sentry H2O Wellness System starts at $380 for DualGuard; TriGuard is $495. Replace its filters at 3,000 gallons or 1 year, whichever comes first. Exact savings depend on household use, so compare those numbers with what you actually spend on bottled water.

Mountain Pure Water · Sentry H2O

The water your family drinks shouldn't be a guess.

Start with your water and your home. We’ll help you explore the Sentry H2O options that fit your routine.

Find my water match

4.92/5 from 531 Sentry H2O store reviews

Independent lab reports, published by Sentry H2O

Alive vs. stripped

Compare water-filtration approaches.

Explore the differences between filtration approaches before choosing what fits your home.

Step 1 · Explore
Ask about your water
A current water report can help you ask better questions before selecting a filtration option.
Look up your water
Step 2 · Compare
Compare approaches
Different filtration approaches are built differently. Compare the questions, tradeoffs, and options that fit your home.
See the lab numbers
Step 3 · Decide
Consider water use and fit
Water use can vary by system and installation. Review the details of the approach you are considering.
Find my system

Use the comparison as a starting point, then review your own water information before deciding.

See the honest side-by-side

Compare system details with your household’s water needs before making a decision.

Real customers, real water

Rated by Sentry H2O customers

Verified Sentry H2O reviews — no stock quotes, no cherry-picking.

Sentry H2O store review snapshot, independently collected by Judge.me, as of August 2026.

4.92/5★★★★★

Based on 531 reviews as of August 202692% Verified

August 2026 review-count snapshot.

Rating, count and verification rate checked on Judge.me September 15, 2026.

See the Sentry H2O store reviews →

Reviews independently collected & verified by

Start here

What's really in your water?

"Treated" and "legal" don't mean what most people think. Start with the public data — then see how your own city measures up.

45%: of U.S. tap water carries at least one PFAS "forever chemical."USGS national study, 2023
2.1B: people worldwide still lack safely managed drinking water.WHO / UNICEF, 2025
~4M: lead service lines still feed U.S. homes.EPA lead service line inventory, 2024

Salt Lake City, UTHAA9 582×

City contaminant overview

36+contaminants
detected

16 exceed EWG’s health guidelines

Chromium-6ArsenicTTHMsHAA5 & HAA9NitratePFAS

and more across the Salt Lake City system

360,654 people served · EWG Tap Water Database

See the full report

Published results, in context

What the published tests found

400×
Salt Lake City PFAS, one report
One Salt Lake City PFAS result was about 400× an EWG advocacy health guideline while legal limits were met.
Source details
97.44–99.93%
Tempe under-sink test, PFAS
In one independent Tempe before-and-after test of the complete under-sink system, the three PFAS quantified both before and after fell 97.44–99.93% per compound (PFHxA, PFHpA, PFBS); several others were not detected above the lab's detection limit after filtration.
How it was tested
6.838.21
Tempe under-sink test, pH
In one Tempe under-sink test, pH measured 6.83 before filtration and 8.21 after.
How it was tested

Check your tap water Compare the technologies

About these numbers

City figures come from the EWG Tap Water Database, by water utility, plus each system's Consumer Confidence Report. Numbers vary by ZIP code, water system, and reporting period. EWG health guidelines are science-based benchmarks — not enforceable legal limits. A utility can fully comply with the law and still exceed them.
Each Tempe result is one test of the tested water and system, not a prediction for other water sources. The pH result is not a health-outcome claim.
PFAS exposure is associated with health concerns; review the EPA PFAS guide for public-health information. Review the source details, reporting period, and the facts that apply to your own water system before making a filtration decision.

Beyond your glass

Every filtered glass is a bottle that never gets made.

single-use bottles a family of four can skip every year with filtered water on tap.

Shop whole home See the honest comparison

of all plastic ever made has been recycled

OECD, 2022

~80%

still sits in a landfill or the environment

Science Advances, 2017

plastic bottles bought every minute, worldwide

Euromonitor / The Guardian

Bottle count estimated from ~156–167 bottles per person a year (industry compilations) — yours depends on what you buy today. Plastic figures describe global plastic waste broadly; sources on file.

Why it's worth it

The difference you feel at home

A Sentry H2O system starts with the questions that matter at home: where you use water, what your report says, and which options you want to compare.

Water for everyday routines
Explore under-sink and whole-home filtration for the places your household uses water most.
Options for shower routines
Consider shower filtration alongside the rest of your home’s water plan.
A better starting point
Use your water report and household needs to compare the available options.
Less reliance on single-use bottles
A home water plan can help you consider alternatives to bottled water.

A family in a bright modern kitchen filling a glass of clean water, the Sentry H2O 3-stage under-sink system visible in the open cabinet below — **4.92/5**531 Sentry H2O store reviews

Hard water & scale

The scale hard water leaves is wearing your home down.

Hard water carries dissolved calcium and magnesium. When it heats or dries, those minerals fall out and harden into scale — the white crust on a showerhead is just the part you can see. The expensive part builds up unseen, inside pipes, the water heater and every appliance on the line.

A chrome showerhead caked with white limescale from untreated hard water, beside the same style of showerhead kept free of scale — drag to compare

With scale controlUntreated hard water

The difference hard-water scale makes on one fixture. Salt-free scale control treats water at the point of entry so deposits like this never get the chance to build — it's prevention at the source, not a descaling scrub.

Water heaters work harderScale insulates the heating element, so the heater burns more energy and wears out sooner.
Appliances age fasterDishwashers, ice makers and coffee lines all run mineral-laden water day after day.
Fixtures crust and spotThe white film on showerheads and faucets is the scale you can see — the rest builds up unseen.
More soap, less cleanHard-water minerals fight your soap, so shampoo, detergent and dish soap all go further to do less.
Skin and hair never feel rinsedThat tight, filmy after-shower feeling is a classic hard-water complaint.

Salt-free scale control changes that. The Sentry H2O whole-home system treats water where it enters your house — managing the minerals before they harden onto your pipes, water heater and fixtures, without the brine tank or bags of salt a traditional softener needs.

But the right fix starts with knowing your numbers. Find out exactly what's in your water first.

See what's in your area's water

Curious what it all adds up to?Read what hard water really costs your home →

Know your water

What's really in your tap water?

Enter your ZIP and see the contaminants found in your local supply — with the EPA legal limit, the stricter health guideline, and how far over it runs. No leaving the page.

Salt Lake City, UT · Salt Lake City Dept. of Public Utilities

PWSID UTAH18026 · serves 360,654 people · data 2021–2025

C — Fair

contaminants detected

over health guidelines

EPA legal violations

Legal on paper — zero EPA violations — yet 16 contaminants exceed the stricter, science-based health guidelines. That gap is exactly what a home filter is for.

Contaminant	Your area	EPA legal limit	Health guideline	Over guideline
Haloacetic acids (HAA9)	34.9 ppb	No federal limit	0.06 ppb	582× over
Haloacetic acids (HAA5)	32 ppb	60 ppb	0.1 ppb	324× over
Total trihalomethanes (TTHMs)	40 ppb	80 ppb	0.15 ppb	223× over
Arsenic	0.96 ppb	10 ppb	0.004 ppb	109× over
Chromium-6	0.44 ppb	100 ppb (total Cr)	0.02 ppb	22× over
Nitrate	1.62 ppm	10 ppm	0.14 ppm	12× over

Haloacetic acids (HAA9)582× over

Your area: 34.9 ppb
EPA legal limit: No federal limit
Health guideline: 0.06 ppb

Haloacetic acids (HAA5)324× over

Your area: 32 ppb
EPA legal limit: 60 ppb
Health guideline: 0.1 ppb

Total trihalomethanes (TTHMs)223× over

Your area: 40 ppb
EPA legal limit: 80 ppb
Health guideline: 0.15 ppb

Arsenic109× over

Your area: 0.96 ppb
EPA legal limit: 10 ppb
Health guideline: 0.004 ppb

Chromium-622× over

Your area: 0.44 ppb
EPA legal limit: 100 ppb (total Cr)
Health guideline: 0.02 ppb

Nitrate12× over

Your area: 1.62 ppm
EPA legal limit: 10 ppm
Health guideline: 0.14 ppm

Source: EWG Tap Water Database + Salt Lake City 2025 Consumer Confidence Report (PWSID UTAH18026), data 2021–2025. EWG health guidelines are science-based advocacy benchmarks, not legal limits — a utility can fully comply with EPA law while exceeding them. Educational only; not a claim about your specific address or a health-outcome claim.

These are the exact contaminants a whole-home Sentry H2O system targets.

City or well — both whole-home options include the under-sink drinking unit.

Match my home to a system See whole-home

Los Angeles, CA · LA Dept of Water and Power (LADWP)

PWSID CA1910067 · serves ~4 million people · data 2021–2024

9 over EWG

contaminants detected

over health guidelines

EPA legal violations

Legal on paper — zero EPA violations — yet 9 contaminants exceed the stricter, science-based health guidelines. That gap is exactly what a home filter is for.

Contaminant	Your area	EPA legal limit	Health guideline	Over guideline
Arsenic	~2 ppb	10 ppb	0.004 ppb	500× over
Total trihalomethanes (TTHMs)	~65 ppb	80 ppb	0.15 ppb	433× over
Haloacetic acids (HAA5)	~35 ppb	60 ppb	0.1 ppb	350× over
Chromium-6	~0.24 ppb	No federal limit	0.02 ppb	12× over
Nitrate	~1.7 ppm	10 ppm	0.14 ppm	12× over

Arsenic500× over

Your area: ~2 ppb
EPA legal limit: 10 ppb
Health guideline: 0.004 ppb

Total trihalomethanes (TTHMs)433× over

Your area: ~65 ppb
EPA legal limit: 80 ppb
Health guideline: 0.15 ppb

Haloacetic acids (HAA5)350× over

Your area: ~35 ppb
EPA legal limit: 60 ppb
Health guideline: 0.1 ppb

Chromium-612× over

Your area: ~0.24 ppb
EPA legal limit: No federal limit
Health guideline: 0.02 ppb

Nitrate12× over

Your area: ~1.7 ppm
EPA legal limit: 10 ppm
Health guideline: 0.14 ppm

Source: EWG Tap Water Database + LADWP 2024 Water Quality Report (PWSID CA1910067), data 2021–2024. EWG health guidelines are science-based advocacy benchmarks, not legal limits — a utility can fully comply with EPA law while exceeding them. Educational only; not a claim about your specific address or a health-outcome claim.

These are the exact contaminants a whole-home Sentry H2O system targets.

City or well — both whole-home options include the under-sink drinking unit.

Match my home to a system See whole-home

New York City, NY · NYC Dept of Environmental Protection

PWSID NY7003493 · serves ~9.5 million people · data 2021–2024

6 over EWG

contaminants detected

over health guidelines

EPA legal violations

Legal on paper — zero EPA violations — yet 6 contaminants exceed the stricter, science-based health guidelines. That gap is exactly what a home filter is for.

Contaminant	Your area	EPA legal limit	Health guideline	Over guideline
Haloacetic acids (HAA5)	~65 ppb	60 ppb	0.1 ppb	650× over
Total trihalomethanes (TTHMs)	~56 ppb	80 ppb	0.15 ppb	373× over

Haloacetic acids (HAA5)650× over

Your area: ~65 ppb
EPA legal limit: 60 ppb
Health guideline: 0.1 ppb

Total trihalomethanes (TTHMs)373× over

Your area: ~56 ppb
EPA legal limit: 80 ppb
Health guideline: 0.15 ppb

Source: EWG Tap Water Database + NYC DEP 2024 Drinking Water Supply & Quality Report (PWSID NY7003493), data 2021–2024. EWG health guidelines are science-based advocacy benchmarks, not legal limits — a utility can fully comply with EPA law while exceeding them. Educational only; not a claim about your specific address or a health-outcome claim.

These are the exact contaminants a whole-home Sentry H2O system targets.

City or well — both whole-home options include the under-sink drinking unit.

Match my home to a system See whole-home

Phoenix, AZ · City of Phoenix Water Services Dept.

PWSID AZ0407025 · serves ~1.7 million people · data 2021–2024

8 over EWG

contaminants detected

over health guidelines

EPA legal violations

Legal on paper — zero EPA violations — yet 8 contaminants exceed the stricter, science-based health guidelines. That gap is exactly what a home filter is for.

Contaminant	Your area	EPA legal limit	Health guideline	Over guideline
Arsenic	4.1 ppb	10 ppb	0.004 ppb	1026× over
Chromium-6	0.41 ppb	No federal limit	0.02 ppb	20× over
Chlorite	131 ppb	1,000 ppb	50 ppb	3× over

Arsenic1026× over

Your area: 4.1 ppb
EPA legal limit: 10 ppb
Health guideline: 0.004 ppb

Chromium-620× over

Your area: 0.41 ppb
EPA legal limit: No federal limit
Health guideline: 0.02 ppb

Chlorite3× over

Your area: 131 ppb
EPA legal limit: 1,000 ppb
Health guideline: 50 ppb

Source: EWG Tap Water Database + City of Phoenix Water Quality Report (PWSID AZ0407025), data 2021–2024. EWG health guidelines are science-based advocacy benchmarks, not legal limits — a utility can fully comply with EPA law while exceeding them. Educational only; not a claim about your specific address or a health-outcome claim.

These are the exact contaminants a whole-home Sentry H2O system targets.

City or well — both whole-home options include the under-sink drinking unit.

Match my home to a system See whole-home

Las Vegas, NV · Las Vegas Valley Water District

PWSID NV0000090 · serves ~1.5 million people · data 2021–2024

17 over EWG

contaminants detected

over health guidelines

EPA legal violations

Legal on paper — zero EPA violations — yet 17 contaminants exceed the stricter, science-based health guidelines. That gap is exactly what a home filter is for.

Contaminant	Your area	EPA legal limit	Health guideline	Over guideline
Total trihalomethanes (TTHMs)	77 ppb	80 ppb	0.15 ppb	513× over
Arsenic	~2 ppb	10 ppb	0.004 ppb	500× over
Haloacetic acids (HAA5)	42 ppb	60 ppb	0.1 ppb	420× over

Total trihalomethanes (TTHMs)513× over

Your area: 77 ppb
EPA legal limit: 80 ppb
Health guideline: 0.15 ppb

Arsenic500× over

Your area: ~2 ppb
EPA legal limit: 10 ppb
Health guideline: 0.004 ppb

Haloacetic acids (HAA5)420× over

Your area: 42 ppb
EPA legal limit: 60 ppb
Health guideline: 0.1 ppb

Source: EWG Tap Water Database + LVVWD 2024 Water Quality Report (PWSID NV0000090), data 2021–2024. EWG health guidelines are science-based advocacy benchmarks, not legal limits — a utility can fully comply with EPA law while exceeding them. Educational only; not a claim about your specific address or a health-outcome claim.

These are the exact contaminants a whole-home Sentry H2O system targets.

City or well — both whole-home options include the under-sink drinking unit.

Match my home to a system See whole-home

Open the full water-report tool →

Seen on Instagram

Utah's water problem is going viral

Millions of views on what's coming out of Utah taps. We build the fix.

1 / 5Swipe, scroll or use the arrows

Third-party content shown via Instagram's public embed feature. Views and claims belong to their creators, not Mountain Pure Water.

1.Specialty Coffee Association (SCA) Golden Cup Standard — recommended brewing water 75–250 ppm total dissolved solids. Taste is subjective and varies by coffee and roast.
2.Calcium contributes to the maintenance of normal bones — EU Commission Regulation (EU) 432/2012, EFSA-approved nutrient claim.
3.Magnesium contributes to normal muscle function — EU Commission Regulation (EU) 432/2012, EFSA-approved nutrient claim.

The water your family drinks shouldn't be a guess.

Compare water-filtration approaches.

Ask about your water

Compare approaches

Consider water use and fit

Rated by Sentry H2O customers

What's really in your water?

What the published tests found

Every filtered glass is a bottle that never gets made.

The difference you feel at home

Water for everyday routines

Options for shower routines

A better starting point

Less reliance on single-use bottles

The scale hard water leaves is wearing your home down.

What's really in your tap water?

We don't have a verified report for your ZIP yet.

Utah's water problem is going viral

Your water, matched — start here

Never think about filters again

Whole-home filtration

Under-sink Wellness System

Learn