Chromium-6 in Water
The short answer on chromium-6
The federal limit regulates *total* chromium at 100 ppb; hexavalent chromium (Cr6, the "Erin Brockovich chemical") has no federal standard of its own. California set the nation's first Cr6-specific limit at 10 ppb (effective October 2024). Boiling does not remove it and no pitcher or fridge carbon filter claims it — the PAA-frequent questions, both answered no. Reverse osmosis and anion exchange r… The details — sources, official limits and honest removal methods — are in the complete guide: The complete chromium-6 guide.
How to remove chromium-6 — what actually works
| Technology | Where it lives | What to demand on paper |
|---|---|---|
| RO / resin | Point-of-use or whole-house system per spec | Named NSF/ANSI protocol or third-party lab sheet for the exact model |
If a listing claims chromium-6 reduction and cannot name the standard or show the lab sheet, assume it does not have one. That single check filters out most of the market.
Can your refrigerator filter handle chromium-6?
No — standard carbon cartridges are not engineered for it. The technologies above are the ones that address it; your fridge filter still does its own job (chlorine, taste, and with a 53 claim, lead and cysts). Fridge cartridges are built for chlorine, taste and odor (NSF/ANSI 42), plus lead and cysts on certified 53 tiers. If chromium-6 is your concern, keep the fridge cartridge for what it does well and put the right technology where you drink: see what your fridge model takes, then match the removal stage to the contaminant.
Chromium-6 questions, answered straight
Does boiling water remove chromium-6?
Boiling is a concentration step, not a filter: water leaves as steam and whatever is dissolved stays behind, so levels rise by roughly the volume lost. The only heat-based method that works is distillation — capturing and condensing the steam. For chromium-6 specifically, see the full guide.
Is my refrigerator water filter enough for chromium-6?
No — standard carbon cartridges are not engineered for it. The technologies above are the ones that address it; your fridge filter still does its own job (chlorine, taste, and with a 53 claim, lead and cysts). Match the technology to the contaminant, not the badge on the box.
How do I find out my actual chromium-6 level?
On city water, your utility's annual Consumer Confidence Report lists it free. On a well, a lab mail-in panel is the reliable route — the test-first card above links our guide to reading the results.
What removes chromium-6 from drinking water?
The technologies with a track record for chromium-6: ro / resin. Claims worth having come with a named standard (NSF/ANSI protocol or third-party lab sheet) — buy where the certificate names the exact part number.
Go deeper
Every contaminant, one page each
48 water problems from EPA primary, secondary and unregulated lists — sources, official limits, and which filters actually work (and which honestly don’t). Browse the Water Problems A–Z →