Chromium is an odorless, tasteless metallic element. One form, chromium-3, is essential to human health and is found in many vegetables, fruits, meats and grains and is often included in multi-vitamins. Its cancer-causing cousin, the chromium-6 infamous from the California exposure and Hollywood movie about Erin Brockovich, occurs naturally but is also produced in high quantities by industry, and can contaminate both soil and groundwater.