Softened water is generally safe to drink, but most people don't prefer it, and some households should avoid it entirely

Softened water tastes different—slightly salty and flatter than hard water—because the softening process swaps calcium and magnesium minerals for sodium. That trade-off is what removes the scale buildup in your pipes and appliances, but it also means you're drinking added salt every time you pour a glass. For most healthy adults, this is not a health risk. For people on sodium-restricted diets, infants, or those with certain medical conditions, it can be a real concern.

The decision to drink softened water depends on your health situation, your local water hardness, and whether you're willing to accept the taste. Many households solve this by softening water for washing and cleaning but keeping one unsoftened tap—usually in the kitchen—for drinking and cooking.

Key Takeaways

  • Softened water contains added sodium from the ion exchange process, which is safe for most people but not for those on low-sodium diets or with certain medical conditions.
  • The sodium content in softened water varies based on how hard your incoming water is—harder water requires more salt during softening, adding more sodium to the final product.
  • Infants under six months should not drink softened water because their kidneys cannot process the added sodium effectively.
  • Installing a bypass line to keep one kitchen tap unsoftened is a common and inexpensive way to have soft water for cleaning while preserving hard water for drinking.
  • If you drink softened water regularly, ask your doctor about sodium intake, especially if you have high blood pressure, heart disease, or kidney problems.

How much sodium ends up in your softened water

The amount of sodium in softened water depends directly on how hard your water is. A water softener removes hardness minerals by trading them for sodium ions—the harder the water, the more sodium gets added. If your water is only slightly hard, the sodium increase is minimal. If it's very hard, the sodium content can become significant.

You can find out your water hardness by looking at a recent water quality report from your city or county water department, or by testing a sample yourself with an inexpensive kit from a hardware store. The report will list hardness in parts per million (ppm) or grains per gallon (gpg). A softener manufacturer or water testing company can estimate sodium content based on your hardness level, but the exact amount depends on your specific equipment and settings.

For perspective: a person on a typical low-sodium diet is usually limited to 1,500 to 2,300 mg of sodium per day. If your water is very hard and you drink several glasses of softened water daily, that could add 100 to 300 mg of sodium—meaningful, but not necessarily disqualifying on its own. The question is whether that fits your personal sodium budget.

Who should not drink softened water

Infants under six months old should never drink softened water. Their kidneys are still developing and cannot regulate sodium the way adult kidneys do. Even small amounts of added sodium can stress their system. If you have a water softener and a baby under six months, use unsoftened water for formula and drinking water.

People with high blood pressure, heart disease, or kidney disease should check with their doctor before drinking softened water regularly. These conditions often require strict sodium control, and softened water can make that harder to manage. Your doctor knows your specific situation and can tell you whether the sodium content is a concern for you.

People on sodium-restricted diets prescribed by a doctor should treat softened water the same way they treat any other sodium source—count it. If your diet allows 1,500 mg of sodium per day and your softened water adds 200 mg, that leaves 1,300 mg for food. It's manageable, but only if you're aware of it.

The taste and mineral content issue

Beyond sodium, softened water tastes noticeably different to most people. It feels slippery on your skin and in your mouth because there are fewer minerals to interact with soap. Some people describe it as flat or slightly salty. Others don't mind it at all. Taste is personal, and there's no right answer—but if you dislike the taste, that's a valid reason to keep one unsoftened tap for drinking.

Softened water also removes beneficial minerals like calcium and magnesium that hard water naturally contains. These minerals contribute to bone health and other body functions. Softened water doesn't harm you—your diet provides these minerals through food—but you lose that small supplemental source. If you're concerned about mineral intake, drinking some hard water alongside softened water is one way to maintain that balance.

Setting up a bypass line for drinking water

The most practical solution for many households is to install a bypass line that keeps one tap—usually the kitchen sink—on unsoftened water while the rest of the house gets soft water. This way you get soft water for showers, laundry, and dishwashing, but hard water for drinking and cooking.

A bypass line is a straightforward plumbing addition that diverts a small amount of water around the softener before it reaches your home. A plumber can install one in an hour or two, and the cost is typically between $150 and $300 depending on your setup. Some water softeners come with a bypass valve already built in, so ask your installer whether yours does.

If a full bypass line isn't practical or affordable right now, a simpler option is to install a separate drinking water filter at the kitchen sink. This won't remove the sodium that's already in softened water, but it can improve taste and remove other contaminants. A basic under-sink filter costs $100 to $300 and requires no plumbing changes.

Testing your softened water for sodium

If you want to know the exact sodium content of your softened water, you can have it tested by a certified lab. Your local health department or water utility can recommend a lab, or you can search online for "water testing lab near me." A basic sodium test costs $20 to $50 and takes a few days to a week for results.

You can also estimate sodium content using your water hardness and softener settings. Most softener manuals include a chart showing estimated sodium output based on incoming hardness. If you don't have your manual, contact the manufacturer with your water hardness number and they can tell you roughly how much sodium your softener is adding.

What to do if you're concerned about sodium

Start by talking to your doctor if you have a condition that requires sodium control. They can tell you whether softened water is a problem for you specifically, or whether the amount is small enough that it doesn't matter. Many people worry unnecessarily, and a quick conversation can put your mind at ease.

If your doctor says you should limit sodium from softened water, your options are: install a bypass line to keep one unsoftened tap, use a point-of-use filter at the kitchen sink, or switch to a different water treatment method. A reverse osmosis filter, for example, removes both hardness minerals and sodium, but it's more expensive and wastes some water in the process. A water softener with a bypass line is usually the most practical middle ground.

Frequently Asked Questions

Can I drink softened water every day?

Yes, most healthy adults can drink softened water daily without health problems. The sodium content is usually small enough that it doesn't matter unless you're on a strict low-sodium diet or have a condition like high blood pressure. If you fall into that category, talk to your doctor about whether the amount in your specific water is a concern.

Does softened water cause high blood pressure?

Softened water alone does not cause high blood pressure in healthy people. However, if you already have high blood pressure and are on a sodium-restricted diet, the added sodium in softened water can make blood pressure harder to control. Your doctor can advise whether softened water fits into your treatment plan.

Is softened water bad for plants?

Softened water is not ideal for plants because the sodium can build up in soil over time and interfere with nutrient absorption. If you water indoor or outdoor plants with softened water regularly, they may eventually show signs of stress. Using unsoftened water for plants is better, or watering with softened water occasionally mixed with rainwater or unsoftened water.

Why does softened water feel slippery?

Softened water feels slippery because it has fewer minerals to interact with soap. Hard water minerals bind to soap and create a film; soft water doesn't, so soap spreads more easily across your skin. This is why softened water is better for washing but feels strange to drink if you're used to hard water.

Can I use softened water for cooking?

Yes, softened water is safe for cooking. Some people prefer it because it doesn't leave mineral deposits on cookware or affect the taste of tea and coffee the way hard water does. Others prefer hard water for cooking because they like the mineral content. It's a matter of preference, not safety.