Why it matters
The Water Test Kit, in short.
Stop guessing what's in your water. This lab-grade kit tells you exactly what you're drinking, so you buy the right system once — no over-spending, no under-protecting.
On a well, it's required before we build your Whole House System: well water is different at every address, and the test is how we get yours right and keep your warranty valid. Knowledge first, clean water next.
Go deeper
The complete breakdown
Everything about the Water Test Kit — what it targets, how it installs, maintenance and the honest limits.
The details
Specifications
Specifications reflect the manufacturer (Sentry H2O). See our Science page for published independent lab reports and testing gaps. Sentry H2O reports its systems are tested to NSF standards; certification documents are being finalized, so we do not call them NSF certified.
Straight answers
Common questions
Is the Sentry H2O Water Test Kit right for my home? +
Anyone who wants to know exactly what’s in their water before they buy. Not sure? Our 60-second quiz confirms fit in a minute.
How often do filters need replacing? +
One-time. Subscribe to auto-ship and we'll send the exact refill on schedule with a reminder.
What if it is not right for me? +
Every refill is backed by a 30-day money-back guarantee. Filters and filter media are consumables.
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. You get cleaner, better-tasting water without wasting a drop or plugging anything into the wall.
Does the system need electricity or produce wastewater? +
No electricity, no drain connection, and no wastewater. Reverse osmosis systems can reject 3 to 5 gallons for every gallon they make; our Sentry H2O systems reject none and run on normal household water pressure. That means no extra drain line, no outlet, and nothing to plug in.
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.
Real customers, real water
What owners actually say
Verified Sentry H2O reviews, independently collected by Judge.me.
Verified reviews of Sentry H2O systems, independently collected by Judge.me.
Reviews independently collected & verified by
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
A mail-in lab kit such as Tap Score by SimpleLab tells you exactly what is in your own water.
Get a Tap Score kit (SimpleLab) →Want help matching the result to a Sentry H2O system?