A new $399 at-home kit claims it can tell you whether your water filter is actually doing its job, by testing a single tap water sample for more than 100 contaminants.
Quick Take
- ROSE launched a home water test called The Water Test, sold through getrose.com for $399.
- The kit checks one tap water sample for over 100 contaminants, including PFAS, pesticides, heavy metals, and disinfection byproducts.
- Samples get analyzed at a lab the company describes as ISO-certified.
- Separate from ROSE, groups like NSF independently certify many water filters by testing their actual contaminant removal claims.
What The New Water Test Actually Checks
ROSE announced its launch on October 14, 2026, calling itself the first “exposure health” company focused on water. The company’s flagship product, The Water Test, analyzes one tap water sample in a partner laboratory for more than 100 contaminants. That list includes PFAS, pesticides, heavy metals, disinfection byproducts, volatile organic compounds, and petroleum compounds, according to the launch materials.
The kit costs $399 and ships through the company’s website. ROSE also sells a two-tap bundle, built around the idea that kitchen and bathroom water can differ in quality inside the same home. That detail matters for anyone who assumes one faucet represents the whole house.
Why Taste Alone Won’t Tell You What’s In Your Water
Water can look clear and taste perfectly fine while still carrying lead, arsenic, or PFAS at levels a lab would flag. Coverage of the ROSE launch leaned on that exact point to explain why lab testing matters more than a quick glance or a sip. Contaminants like these typically have no smell, no color, and no taste a person could detect at home.
That is the whole reason laboratory-grade testing exists as a category. A filter pitcher or under-sink system might feel like it’s working simply because the water tastes cleaner. Whether it is actually removing PFAS or heavy metals is a separate question, one that requires measuring before-and-after samples rather than trusting appearance.
How Filters Get Independently Verified Today
Outside of ROSE’s new test, there is already an established path for checking filter performance: third-party certification. NSF, a widely used certification body, tests assembled filtration systems to confirm they actually reduce the specific contaminants listed on their packaging. That process checks both safety and label accuracy, not just whether a filter sounds effective.
NSF certification also covers specific standards tied to specific threats. Filters certified to NSF/ANSI Standard 53 or Standard 58, for example, are evaluated for their ability to limit PFAS exposure specifically. No federal law requires home filters to carry this kind of certification, which is exactly why voluntary, independent testing standards were created in the first place.
Certified laboratories themselves go through their own vetting. Massachusetts regulators note that certification evaluates a lab’s facilities, personnel, equipment, and whether its methods are approved by the Environmental Protection Agency. That layered system of checks is what lets a consumer trust a result without personally verifying the chemistry behind it.
What To Ask Before Trusting Any Water Test Result
A consumer weighing a product like The Water Test should look for the same basics that underpin trusted filter certifications: a named lab, a clear list of exactly what gets measured, and the method used for each contaminant. Price is a real factor too. At $399 per kit, it is a bigger ask than many household budgets handle for routine testing, let alone repeat testing after installing a new filter.
None of this takes away from the basic appeal of the idea. Knowing what is actually flowing out of your tap, rather than assuming a filter handles it, is a reasonable thing for any homeowner to want. The smartest move is pairing a reputable test with independently certified filtration, so both the problem and the fix get measured the same honest way.
Sources:
mindbodygreen.com, rosecitylabs.com, businesswire.com
