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Industrial carcinogen made famous by Erin Brockovich case. Below are US cities ranked by their measured Chromium-6 levels compared to EPA limits. Higher percentages indicate greater concern.
Vulnerable Populations: California set a much stricter limit of 10 ppb before withdrawing it due to cost concerns. Health advocates recommend under 0.02 ppb.
Ranked by percentage of the EPA limit, using one real EPA measurement per water system. Click any city for its full report.
Historical data. Figure shown is the average of the system's 2012–2019 finished-water compliance samples (EPA Six-Year Review 4), non-detects counted as zero. Treat as history, not today's tap water.
EPA's public datasets do not carry per-system results for Chromium-6 in a form we can rank, so no city table is shown.
| Rank | City | State | Level | Period | EPA Limit | % of Limit | Status | Population |
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Most effective home option. Point-of-use systems.
Specialized resin for chromium-6. Professional installation.
Converts Cr-6 to less toxic Cr-3, then filters. Advanced systems only.
Yes. The Hinkley, California contamination that inspired the movie involved hexavalent chromium from PG&E's cooling towers.
The EPA limit covers total chromium, not specifically chromium-6. Health advocates have pushed for separate, stricter limits for chromium-6.
Most standard carbon filters are not effective. Reverse osmosis or specialized anion exchange is needed.