The concentration of magnesium in Darby Creek ranged from 10.7 to 11.7 milligrams per liter in filtered water and the concentration of calcium ranged from 22.5 to 24.6 milligrams per liter. The sodium concentration ranged between 11.1 and 13.0 milligrams per liter and the potassium concentration ranged between 2.15 and 2.80 milligrams per liter. The manganese concentration ranges from 10.6 to 25.6 milligrams per liter and the iron concentration ranges from 18.9 to 60.7 milligrams per liter. The boron concentration ranges from an estimated 12 to 16 milligrams per liter.