The third and most common way to reduce nitrates is to dilute the nitrate-polluted water by blending it with water from another source that has low nitrate concentrations. Blending the two waters produces water that is low in nitrate concentration. Blended water is not safe for infants but is frequently used for livestock. There is no simple way to remove all nitrate from your water. Although it is common to think of boiling, softening or filtration is a means of purifying water, none of these methods reduce nitrate contamination.
Boiling water is ,in fact, the worst thing to do because it actually concentrates the nitrate.
Softening and filtration do nothing at all to remove nitrate.