First posted April 25, 2023 For additional information, contact: Director,California Water Science CenterU.S. Geological Survey6000 J Street, Placer HallSacramento, California 95819 Chromium concentrations in rock and aquifer material Hinkley Valleys the Mojave Desert, 80 miles northeast of Los Angeles, California, are generally low compared to average chromium concentration 185 milligrams per ...