Portland’s main source for water is the pristine Bull Run Watershead. When required, it may be supplemented with some water from the Columbia South Shore Well Field. Overall, the water is very pure.
| Average | |
|---|---|
| Calcium (Ca+2) | |
| Magnesium (Mg+2) | |
| Bicarbonate (HCO3-1) | |
| Chloride (Cl-1) | |
| Sodium (Na+1) | |
| Sulfate (SO4-2) |