From the website (http://www.waterboss.com/watersoftenermyths.shtml)
YOU CAN’T DRINK WATER FROM A WATER SOFTENER
Although many people believe that water from a water softener contains too much sodium for consumption, most do not realize how little sodium is in soft water.
The average amount of sodium in a quart of water from a properly working water softener is 75 to 100mg as opposed to 120 mg in a slice of white bread. If this trace amount of sodium is a concern, a waterboss water softener is capable of using potassium chloride to regenerate the water softener.

The addition of a Reverse Osmosis drinking water system to your water softener can be installed to give you sodium-free drinking water.
http://www.waterboss.com/watersoftenermyths.shtml
From Sheldon G. Sheps, M.D. of MayoClinic.org
So while it is not likely that soft water will increase your sodium intake significantly, I will add two important reasons NOT to drink softened water:
- It just doesn’t taste good! Yes, that is my opinion, but I am not alone in that thinking. The water does taste different and I don not like it!
- There are a whole lot of other contaminants in the water supply that aren’t good for you that a water softener cannot remove – like Chlorine, Chloramine, THM, TCE, PCB, pesticides and chemicals.
Solution: I drink water that is purified by reverse osmosis, which is the best way known to man to remove the largest spectrum of contaminants from the water. Since reverse osmosis or RO was developed to desalinate sea water, it effectively removes the sodium as well. That leaves you with chemical-free, sodium free, healthy, great-tasting water that you can rely on. To those who say, that the minerals in the water are good for you and you should not remove them – what about the chemicals that aren’t good for you? Listen to this: WATER IS NOT A SIGNIFICANT SOURCE OF MINERALS! You get minerals from your food and supplements. Don’t obfuscate the issue. However, if you are concerned with keeping you water mineralized, we now have re-mineralization filters that do just that after the RO process. You can have your cake and eat it too!
