You should not drink water from a water softener, and most systems include a bypass so you don't have to
Water softeners remove minerals like calcium and magnesium by replacing them with sodium. The result is softer water that's better for your skin, hair, and appliances — but it's not meant for drinking. The sodium added during the softening process makes the water taste salty and can be a concern for people on sodium-restricted diets, infants, and those with certain health conditions.
The good news is that most home softeners come with a bypass line that lets you draw unsoftened water from a separate tap, usually at the kitchen sink. This is the water you should drink and use for cooking. If your softener doesn't have a bypass installed, a plumber can add one — it's a straightforward job that costs between $150 and $300 in most areas.
Key Takeaways
- Water softeners add sodium to your water, making it unsuitable for drinking and cooking without a bypass line.
- A bypass line lets you draw unsoftened water from a separate tap, usually installed at the kitchen sink.
- Softened water is safe to use for bathing, laundry, and washing dishes, where the sodium poses no health risk.
- If your softener has no bypass, a plumber can install one for a few hundred dollars.
- People on low-sodium diets, infants, and those with high blood pressure should avoid drinking softened water entirely.
Why softeners add sodium and what it means for your health
A water softener works by running hard water through a resin bed filled with sodium ions. As calcium and magnesium pass through, they stick to the resin and sodium is released into the water in their place. This ion exchange is what makes the water soft — but it also raises the sodium content.
The amount of sodium added depends on how hard your water is. If your water is very hard, the softener adds more sodium to do its job. A rough estimate: for every grain of hardness removed per gallon, about 7.5 milligrams of sodium is added. Hard water (over 10 grains per gallon) can result in softened water with 70 to 100 milligrams of sodium per liter — enough to taste noticeably salty to most people.
For most healthy adults, this level of sodium is not dangerous in small amounts. But for people managing high blood pressure, on a doctor-prescribed low-sodium diet, or caring for infants under one year old, drinking softened water regularly can add up. Infants are especially sensitive because their kidneys are still developing and cannot handle excess sodium the way adult kidneys can.
How to set up a bypass so you have unsoftened water to drink
If your softener was installed by a professional, it almost certainly has a bypass valve already built in. Look under your kitchen sink or at the point where the water line enters your home. You should see a three-way valve or a separate line branching off from the main softened water line. This bypass line carries hard water directly to a dedicated tap — usually a third faucet at the sink, separate from your hot and cold handles.
If you have a bypass valve but it's not connected to a tap, or if your softener has no bypass at all, you have two options. The simpler one is to install a separate faucet on the bypass line yourself using a basic kit from a hardware store — these cost $20 to $50 and take an hour or two. The more reliable option is to call a plumber, who will may support the line is properly connected, the water pressure is balanced, and the tap is positioned where you want it. This usually costs $150 to $300.
Before you call a plumber, check your softener's manual or the paperwork from installation. It will tell you whether a bypass exists and where to find it. If you can't locate the manual, take a photo of your softener's model number and search for it online — most manufacturers post PDFs for free.
What happens if you drink softened water occasionally
Drinking a glass or two of softened water by accident won't hurt you. The sodium content is not toxic at that level. What matters is regular consumption — if softened water is your main drinking water day after day, the sodium adds up, especially for people with salt sensitivity or medical restrictions.
If you're visiting someone else's home or staying somewhere temporarily and you're not sure whether the water is softened, you can ask directly or look for a softener unit near the water heater or where the main line enters the house. If you're thirsty and can't tell, drinking it once is not a health emergency. But if you're managing high blood pressure or on a sodium-restricted diet, it's worth asking.
Using softened water safely for everything except drinking
Softened water is excellent for bathing, showering, laundry, and washing dishes. The small amount of sodium that stays on your skin after a shower is not absorbed into your body in any meaningful way. Your skin may actually feel better — soft water doesn't leave mineral deposits and is gentler on sensitive skin and eczema.
For laundry, softened water lets detergent work more effectively, so you can use less soap and still get clothes clean. For dishes, there are no spots or film left behind. For your hair, many people find that soft water reduces frizz and makes hair easier to manage. None of these uses involve ingesting sodium, so there's no health concern.
Testing your water hardness to understand your softener's output
If you want to know exactly how much sodium your softener is adding, you can test your water. A basic hardness test kit costs $10 to $20 at any hardware store and takes a few minutes. You test both the hard water (before the softener) and the soft water (after it) to see the difference.
For a more detailed picture, including sodium levels, you can send a sample to a lab. Many county extension offices offer water testing for $15 to $50, or you can use a private lab — search "water testing lab near me" to find one. The results come back in a few days and show you exactly what's in your water, including sodium, chloride, and other minerals.
Knowing your water's sodium content is useful if you're on a low-sodium diet or if you're concerned about the taste. It can also help a plumber recommend the right bypass setup or suggest alternative softening methods, like potassium-based softeners, which add potassium instead of sodium (though these cost more and require special salt pellets).
When to call a plumber about your softener and water lines
Call a plumber if your softener has no bypass line and you want one installed, if the bypass tap isn't working, or if you're not sure whether your system is set up correctly. A plumber can also help if you're considering switching to a potassium-based softener or if you want to install a reverse osmosis filter under your sink for extra drinking water safety.
You don't need a plumber just to use the bypass that's already there — if your softener came with one, it's ready to go. straightforward use the dedicated tap for drinking and cooking water, and use the regular taps for everything else.
Frequently Asked Questions
Can I drink softened water if I'm on a low-sodium diet?
No. People on sodium-restricted diets should avoid softened water as their main drinking water. The sodium content, though small per glass, adds up over time. Use the bypass line to get unsoftened water for drinking and cooking instead.
Does softened water taste salty?
Yes, most people can taste the saltiness in softened water, especially if the original water was very hard. The taste is usually mild but noticeable. If you don't like it, stick to unsoftened water from the bypass line for drinking.
Is softened water safe for babies and young children?
Infants under one year old should not drink softened water regularly because their kidneys cannot handle excess sodium. For older children, occasional softened water is not harmful, but unsoftened water from the bypass is the safer choice for daily drinking.
What if my softener doesn't have a bypass line?
You can install one yourself with a kit (about $20 to $50 and a couple of hours of work) or hire a plumber to do it ($150 to $300). A plumber is the better choice if you're not comfortable with plumbing work or if you want the job done quickly and correctly.
Can I use a pitcher filter instead of a bypass line?
Yes. A pitcher filter or under-sink filter can remove some sodium from softened water, though not all of it. This works if you don't have a bypass line and don't want to install one, but a bypass line is the most straightforward solution.