Last updated: April 2026.
Chromium-6 in Shower Water
Understanding what's in your shower water and how it affects your health
What Is It & How Does It Get Into Water?
Chromium-6 (hexavalent chromium) is a known human carcinogen made famous by the Erin Brockovich case. It contaminates water through industrial pollution and natural geology.
Chromium-6 enters water from chrome plating, steel manufacturing, mineral deposits, and coal ash. Detected in water serving over 200 million Americans.
Health Effects From Shower Exposure
⚠️ Shower-Specific Risks
Shower exposure is particularly significant because you absorb contaminants through skin absorption, inhalation of steam, and direct contact with eyes and mucous membranes during a typical 10-minute shower.
- Skin sensitizer: Known to cause contact dermatitis, rashes, and allergic reactions
- Skin absorption: Unlike Cr-3, hexavalent chromium can penetrate intact skin
- Inhalation: Shower aerosols may carry chromium-6 particles
- Cancer: Known human carcinogen by inhalation, with growing evidence for ingestion
Regulatory Standards & Health Guidelines
EPA vs EWG: The Gap Between Legal and Healthy
| Standard | Level |
|---|---|
| EPA Maximum Contaminant Level (MCL) | 100 ppb for total chromium |
| EWG Health Guideline | 0.02 ppb for Cr-6 (5000x stricter) |
Over 200 million Americans served by systems with detectable chromium-6. NYC water shows levels above EWG health guidelines.
Filtration Methods That Remove It
| Method | Effectiveness | Notes |
|---|---|---|
| KDF-55 Media | Up to 95% | Reduces Cr-6 to less toxic Cr-3 |
| Ion Exchange | Up to 95% | Strong anion exchange resins |
| Activated Carbon | Limited | Some reduction but not primary |
How Afina Shower Filtration Can Help
Afina's multi-stage filtration system uses activated carbon and KDF-55 media to reduce chlorine, heavy metals, and other contaminants — helping protect your skin, hair, and overall health.
Cities Most Affected
While this contaminant can be found in water systems nationwide, these areas tend to have higher levels:
Check your local water quality at the EWG Tap Water Database by entering your zip code.
Related Reading
- water quality in Houston, Texas
- water quality in Phoenix, Arizona
- water quality in Philadelphia, Pennsylvania
Frequently Asked Questions
Is chromium-6 in my water?
Possibly — over 200 million Americans have detectable levels. Check EWG Tap Water Database by zip code.
Can Cr-6 absorb through skin?
Yes. Unlike trivalent chromium, hexavalent chromium penetrates intact skin and is a known skin sensitizer.
Do shower filters remove it?
KDF-55 media effectively reduces chromium-6 by converting it to less toxic chromium-3.
What made Cr-6 famous?
The Erin Brockovich case exposed contamination in Hinkley, California from Pacific Gas & Electric — one of the most well-known water contamination cases.
See what's in your water.
Run a free 60-second report for your ZIP code.
