What Is Hexavalent Chromium and Is It in Utah Water?
Chromium-6 — the Erin Brockovich contaminant — has been detected in Orem and West Jordan water at levels 36x and 93x the EWG health guideline. Here's what it is and what reduces it.
Hexavalent chromium — chromium-6 — became a household name through the Erin Brockovich case, which documented contamination in Hinkley, California. Less well-known is that it has been detected in Utah’s Wasatch Front water supplies at levels that significantly exceed EWG health guidelines, including in two of the region’s larger communities.
Here’s what chromium-6 actually is, where it shows up in Utah water, and what residential treatment approaches work.
What Is Hexavalent Chromium?
Chromium is an element that exists in several forms. The two most common in water are:
- Trivalent chromium (chromium-3): An essential trace mineral found in food. Not considered a health concern at typical water levels.
- Hexavalent chromium (chromium-6): A more toxic form associated with industrial use and some natural geological sources. The form that generated the Erin Brockovich story.
The EPA currently regulates total chromium in drinking water — not chromium-6 specifically — at a legal limit of 100 parts per billion (ppb). California has established its own state-level standard for chromium-6 specifically, but the EPA has not yet finalized a separate federal limit for the hexavalent form.
EWG’s health guideline for chromium-6 is 0.02 ppb — based on research suggesting carcinogenic risk at lower concentrations than the current federal total chromium standard accounts for.
Where Is Chromium-6 Detected on the Wasatch Front?
| City | Chromium-6 vs. EWG Guideline | Notes |
|---|---|---|
| West Jordan | 93x | Among the highest in Salt Lake County |
| Orem | 36x | Second-highest detected level in the valley |
Both cities receive water primarily from the Jordan Valley Water Conservancy District. The chromium-6 in these supplies is believed to be largely naturally occurring — from the geological formations the source water moves through — rather than industrial contamination.
All detected levels are within the EPA’s current federal total chromium standard of 100 ppb.
What the Research Says
The California Office of Environmental Health Hazard Assessment (OEHHA) conducted an extensive review of chromium-6 health research after the Hinkley case. Their findings linked long-term chromium-6 exposure (at higher concentrations than typically found in drinking water) to increased cancer risk, particularly gastrointestinal cancers in animal studies.
The EPA’s ongoing assessment of chromium-6-specific health risks has been in process for years. The scientific debate centers on: at what concentration does chromium-6 in drinking water present meaningful long-term health risk? EWG’s 0.02 ppb guideline is based on a conservative interpretation of this research. The current federal 100 ppb total chromium standard is based on older methodology.
For Utah homeowners, the relevant question is practical: at 93x or 36x the EWG health guideline, is action warranted?
That’s a personal decision. What we can offer is clarity on what actually reduces chromium-6 in residential water.
What Reduces Chromium-6?
Reverse osmosis: Highly effective. The RO membrane operates at 0.0001 micron — the membrane blocks dissolved inorganic ions including hexavalent chromium. Multiple studies have confirmed RO as one of the most effective residential approaches for chromium-6 reduction. Blue Logic’s whole-home RO system applies this to every tap in your home.
Ion exchange (some types): Moderately effective. Strong base anion exchange resins can reduce chromium-6. Standard water softener ion exchange (cation exchange) does not address chromium-6.
Activated carbon: Generally not effective for chromium-6. Carbon filtration excels at chlorine and organic compounds, not dissolved heavy metals.
Standard water softener: Not effective for chromium-6.
The Practical Implication for Orem and West Jordan Homeowners
If you live in Orem or West Jordan and are concerned about chromium-6:
- A free in-home water test gives you a starting point and a conversation with a Blue Logic specialist about your city’s specific water profile.
- The whole-home filtration system addresses hardness, chlorine, and iron — but not chromium-6 specifically.
- The whole-home RO system (filtration + RO membrane + storage + pump) addresses chromium-6 at the molecular level — the most complete residential option for Orem and West Jordan homeowners with this specific concern.
The water is federally legal. The concern is long-term cumulative exposure based on EWG’s research-based guidelines. What you decide to do with that information is yours to determine — starting with knowing what’s actually in your home’s water.
Schedule a free in-home water test →
Learn about Orem’s water →
Learn about West Jordan’s water →
Whole-home RO systems →
Chromium-6 data from the EWG Tap Water Database reflecting official utility testing. All levels are within current federal EPA standards. EWG guidelines are stricter than federal law. Blue Logic makes no specific health claims.
Orem water profile → · West Jordan water profile → · Utah water quality guide →
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