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 contains added salt that makes it unsuitable for drinking and cooking. A standard softener adds between 100 and 300 milligrams of sodium per liter, depending on how hard your water is and how the system is set.
The good news is that most residential softeners come with a bypass valve or a separate unsoftened tap, usually at the kitchen sink. This lets you use soft water for washing and cleaning while keeping your drinking and cooking water untreated. If your softener doesn't have one, you can have a plumber install a bypass line — it's a straightforward addition that costs far less than replacing the whole system.
Key Takeaways
- Water softeners add sodium to your water by design, making it unsuitable for drinking without a separate unsoftened tap.
- Most softeners include a bypass valve that lets you draw unsoftened water from a dedicated kitchen sink tap while the rest of the house gets soft water.
- If your softener lacks a bypass, a plumber can install one to give you access to untreated water for drinking and cooking.
- People on sodium-restricted diets, infants, and those with certain health conditions should avoid softened water entirely.
- Softened water is safe for washing, bathing, and cleaning — the sodium concern applies only to consumption.
Why softeners add sodium in the first place
A water softener works by running hard water through a tank filled with resin beads. These beads are coated with sodium ions. When hard water passes through, calcium and magnesium ions stick to the beads and are swapped out for sodium ions — a process called ion exchange. The softened water that comes out the other side contains the sodium that was on those beads.
This is how the system regenerates itself too. Periodically, the softener flushes the tank with a concentrated salt brine solution to strip the calcium and magnesium off the beads and recharge them with sodium. That's why you refill the salt tank regularly — the salt is the fuel that keeps the softening process working.
How much sodium ends up in your water
The amount of sodium your softener adds depends on how hard your water is. Harder water requires more ion exchanges, which means more sodium gets released. A softener treating very hard water (over 15 grains per gallon) might add 300 milligrams of sodium per liter. Moderately hard water (10 to 15 grains per gallon) typically results in 150 to 200 milligrams per liter.
For context, the American Heart Association recommends no more than 2,300 milligrams of sodium per day for most adults. If you drank two liters of softened water from a hard-water system, you'd consume 600 milligrams of sodium just from the water — before accounting for sodium in food. For people on low-sodium diets due to heart disease, kidney problems, or high blood pressure, that's a meaningful amount.
Who should definitely avoid softened drinking water
Certain groups face real health risks from drinking softened water. Infants under six months should never drink softened water because their kidneys cannot regulate sodium the way adult kidneys do. People with congestive heart failure, kidney disease, or cirrhosis should consult their doctor before consuming softened water regularly. Anyone on a sodium-restricted diet prescribed by a physician should stick to unsoftened water.
If you fall into one of these categories, make sure your softener has a bypass or that you have a separate tap for unsoftened water. This isn't a minor convenience — it's a necessary part of using a softener safely in your home.
Setting up a bypass or separate unsoftened tap
Most modern softeners come with a bypass valve already installed, usually a three-way valve near the water inlet. If your softener has one, you can turn the valve to draw unsoftened water directly from the main line, bypassing the softener tank entirely. Check your system's manual to locate it and learn how to operate it.
If your softener doesn't have a bypass, or if you want a dedicated kitchen tap for unsoftened water, a plumber can install a branch line that taps into your main water supply before it reaches the softener. This line runs to a separate faucet, usually installed at the kitchen sink next to the main tap. The cost is typically $200 to $400 for materials and labor, depending on how far the plumber has to run the line and local rates.
What softened water is actually good for
Softened water is excellent for everything except drinking and cooking. It reduces soap scum in showers and tubs, prevents mineral buildup in dishwashers and washing machines, and makes your skin and hair feel cleaner because soap lathers better without minerals interfering. Softened water extends the life of water heaters, pipes, and appliances by preventing scale accumulation inside them.
You can safely bathe and shower in softened water without concern. Some people with sensitive skin actually prefer it because the reduced mineral content is gentler. The sodium in softened water is not absorbed through your skin — it only becomes a concern when you drink or cook with it.
Alternatives if you can't install a bypass
If your softener cannot be retrofitted with a bypass and you cannot afford to install one, you have other options. You can use bottled water for drinking and cooking — this is the most straightforward solution, though it costs more over time. A point-of-use filter pitcher or faucet-mounted filter at your kitchen sink can reduce sodium, though it won't remove all of it.
Another option is a reverse osmosis system installed under the kitchen sink. These systems filter water more thoroughly than standard filters and can remove most sodium, though they produce some wastewater and require filter replacements every six to twelve months. Talk to a water treatment professional about which option makes sense for your situation and budget.
Frequently Asked Questions
Can I drink softened water if I'm on a low-sodium diet?
No — if your doctor has prescribed a low-sodium diet, you should avoid softened water. The sodium content is significant enough to interfere with dietary restrictions. Use unsoftened water from a bypass tap, bottled water, or a reverse osmosis filter instead.
Is softened water safe for pets and plants?
Pets can drink softened water without harm — the sodium levels are not a concern for most animals. Plants are more sensitive; some plants dislike the sodium in softened water, especially if watered with it regularly. If you have a garden or houseplants, use unsoftened water when you can.
What if my softener doesn't have a bypass and I can't afford to install one?
Bottled water for drinking and cooking is the simplest solution. A water filter pitcher is cheaper upfront but requires frequent filter replacements. A reverse osmosis system under the sink is more effective but costs $300 to $800 installed and needs maintenance.
Does boiling softened water remove the sodium?
No — boiling does not remove sodium. It may actually concentrate sodium slightly by reducing the total volume of water. If you need sodium-free water, use a bypass tap, bottled water, or a filter system.
Can I use softened water to make coffee or tea?
Technically yes, but it's not ideal. Softened water will make coffee and tea taste slightly salty to many people. If you notice an off taste, switch to unsoftened water from a bypass tap or bottled water.