Softened water is safe for most households to drink. Ion exchange swaps the calcium and magnesium the USGS defines as hardness for a small amount of sodium, so the water is not purified, it is traded. The amount added rises with how hard the incoming water was, which is why the sensible answer depends on your own hardness number rather than on softened water in general.
What the softener actually changes
The resin bed holds sodium ions and releases them as it grabs calcium and magnesium out of the passing water. Nothing is filtered out in the ordinary sense, and nothing is disinfected: bacteria, nitrate, lead and organic compounds pass straight through a softener untouched. That is worth saying plainly, because many households assume a softener improves drinking-water quality generally. It solves scale and soap problems, and leaves every other question exactly where it was.
Who should think about the sodium
The harder the feed water, the more sodium ends up in the softened output, since the exchange is proportional. Anyone on a medically restricted sodium intake should discuss it with their own doctor rather than take a rule of thumb from a website, and the same goes for water used to prepare infant formula. This hub does not give health advice. What it can tell you is that the amount is predictable from your hardness figure and that plumbing offers a straightforward way around it.
The kitchen bypass, and why installers should fit one
The standard arrangement is to leave one cold tap, usually the kitchen sink, plumbed upstream of the softener so drinking and cooking water stays unsoftened. Outside spigots normally get the same treatment, since plants do better on untreated water and there is no reason to spend salt on the garden. If your installer did not fit a bypass and you want one, it is a short piece of work on the cold line, and our water softener installation guide covers where the tee belongs.
Potassium chloride as the alternative fill
Most softeners will run on potassium chloride instead of sodium chloride, which regenerates the resin the same way and leaves potassium in the water instead of sodium. It costs more per bag and is slightly less efficient, so the machine may need a settings change, but it is a direct swap in most modern valves. Households that want softened water everywhere without adding sodium usually go this route rather than replumbing.
Questions people ask about is soft water safe to drink
Does a softener make water salty?
It should not taste salty at normal hardness levels. A noticeably salty taste usually points at a stuck valve or a brine cycle fault, not normal operation.
Can I water plants with softened water?
It is better not to. Sodium accumulates in soil over time, so keep outside spigots on a bypass upstream of the softener.
Does softened water remove contaminants?
No. Ion exchange targets hardness minerals only, so lead, nitrate, bacteria and organic compounds pass through unaffected.