You should not drink water directly from a water softener
Water softeners remove minerals like calcium and magnesium by replacing them with sodium or potassium. The water that comes out of a softener is safe to use for washing, cleaning, and watering plants, but it is not meant for drinking or cooking. The sodium content in softened water can be a concern for people on low-sodium diets, and the mineral removal process changes the water in ways that make it less suitable for consumption.
If you want to drink water from your tap, you have two practical options: install a separate drinking water line that bypasses the softener, or use a pitcher filter or faucet filter on the kitchen sink. Many households do both — they soften water for household use and keep unsoftened water available for drinking and cooking.
Key Takeaways
- Softened water contains added sodium or potassium and should not be your primary drinking water source.
- A bypass line to your kitchen sink lets you access hard water for drinking while keeping soft water for the rest of your home.
- If you cannot install a bypass, a pitcher filter or under-sink filter can reduce sodium and restore some minerals to softened water.
- People with heart conditions, high blood pressure, or sodium-restricted diets should be especially cautious about drinking softened water.
- Softened water is fine for cooking pasta or rice, but many people prefer unsoftened water for tea and coffee because the minerals affect taste.
Why softened water is not recommended for drinking
A water softener works by swapping out calcium and magnesium ions for sodium or potassium ions. This process makes water "soft" — it lathers better with soap and leaves fewer mineral deposits on fixtures — but it also raises the sodium content. A typical softener adds between 100 and 200 milligrams of sodium per liter, depending on how hard your incoming water is and how the softener is set.
The sodium in softened water is the main concern for drinking. The American Heart Association recommends limiting sodium intake to 2,300 milligrams per day, and many people aim for less. If you drink several glasses of softened water daily, you are adding a noticeable amount of sodium to your diet without getting any nutritional benefit. For people with high blood pressure, heart disease, or kidney problems, this extra sodium can be harmful.
Beyond sodium, softened water lacks the minerals that naturally occur in hard water. While these minerals are not essential nutrients, they do contribute to water's taste and mouthfeel. Many people find softened water tastes flat or slightly salty, which is why they prefer to drink unsoftened water.
Installing a bypass line for drinking water
The most common solution is to run a separate line from your main water supply directly to your kitchen sink, bypassing the softener entirely. This line delivers hard water to your tap while the rest of your home receives softened water. The installation is straightforward if you have access to the plumbing under your sink or in your basement.
A bypass line typically requires a tee fitting, some copper or PEX tubing, and a shutoff valve. If you are comfortable with basic plumbing, you can do this yourself. If not, a plumber can install one in an hour or two for a cost that usually ranges from $150 to $300, depending on how far the line needs to run and your local labor rates. Once installed, you straightforward turn the valve to choose between soft and hard water at that tap.
This approach gives you the best of both worlds: soft water for washing dishes and laundry, and hard water for drinking and cooking. Many households find this the most practical long-term solution because it requires no ongoing maintenance or filter replacement.
Using filters if you cannot install a bypass
If you rent your home or do not want to modify your plumbing, a filter can reduce the sodium in softened water and make it more suitable for drinking. Pitcher filters like Brita or PUR are inexpensive and widely available — they cost $20 to $40 for the pitcher and $5 to $10 per replacement filter. These filters remove some sodium and chlorine, and they improve taste, though they do not eliminate all sodium.
Under-sink filters are a more permanent option. They mount directly under your kitchen sink and deliver filtered water through a separate small faucet. These systems cost $100 to $300 upfront and require filter changes every 6 to 12 months, depending on the model and your water usage. They remove more sodium than pitcher filters and are more convenient because you do not have to refill a pitcher.
Reverse osmosis systems are the most thorough option — they remove nearly all dissolved minerals, including sodium. A reverse osmosis system costs $200 to $500 to install and produces some wastewater in the process, but it delivers the purest drinking water. For people on strict sodium-restricted diets, this may be worth the investment.
Softened water for cooking and other uses
You can use softened water for cooking pasta, rice, and vegetables without any safety concern. The softness actually helps some foods cook more evenly because the water absorbs into them more readily. However, many cooks prefer unsoftened water for tea and coffee because the minerals in hard water can enhance flavor — this is partly why some specialty coffee shops use filtered hard water.
Softened water is ideal for washing dishes, doing laundry, and cleaning because it requires less soap and leaves no mineral spots. It is also fine for watering plants, though some plants that prefer acidic soil may benefit from the slight pH change that softening causes. The main restriction is drinking and, for some people, using it in humidifiers or steam irons where sodium buildup can cause problems over time.
Sodium content varies by your water hardness
The amount of sodium a softener adds depends on how hard your incoming water is. If your water is very hard — say, 20 grains per gallon or higher — the softener will add more sodium to replace all those minerals. If your water is only moderately hard, the sodium addition is smaller. You can find out your water hardness by requesting a water report from your local water utility or by testing your water yourself with an inexpensive kit from a hardware store.
Some softeners use potassium chloride instead of sodium chloride as the regenerant. Potassium-based softeners add potassium rather than sodium, which is better for people on low-sodium diets, but they cost more to operate because potassium chloride is more expensive than sodium chloride. If sodium intake is a serious health concern for you, switching to a potassium-based softener or installing a bypass line are your best options.
What to do if you already drink softened water
If you have been drinking softened water and are concerned about sodium intake, the first step is to check your water hardness and calculate how much sodium you are actually consuming. A moderately hard water supply softened to zero hardness might add 100 to 150 milligrams of sodium per liter — meaning a liter of water per day adds about 100 to 150 milligrams to your daily intake. For most people, this is not a major health risk, but for someone with heart disease or on a strict sodium-restricted diet, it matters.
Talk to your doctor if you have a condition that requires limiting sodium. They can tell you whether the sodium in your softened water is a concern for you personally. In the meantime, switching to a pitcher filter or installing a bypass line will reduce your sodium intake from water and give you more control over what you drink.
Frequently Asked Questions
Is softened water safe to drink in small amounts?
Softened water is not toxic, so drinking a glass occasionally will not harm you. The concern is regular consumption, especially for people with heart or kidney conditions. If you drink softened water daily, the sodium adds up over time.
Can I use softened water in my coffee maker or kettle?
Yes, softened water is safe for coffee makers and kettles. Many people do this because soft water does not leave mineral deposits inside the machine. However, some coffee enthusiasts prefer unsoftened water because they believe the minerals improve flavor.
Does boiling softened water remove the sodium?
No. Boiling water removes chlorine and some other chemicals, but it does not remove dissolved sodium. If you need to reduce sodium, you need a filter or a bypass line.
What if I have a salt-free water softener?
Salt-free softeners do not add sodium because they use a different technology — usually a crystallization process or magnetic field. Water from a salt-free softener is safer to drink than water from a salt-based softener, though it still lacks the minerals of hard water.
Can children drink softened water?
The sodium in softened water is generally not a concern for healthy children, but infants under six months should not drink softened water because their kidneys are still developing and cannot handle excess sodium well. For older children, softened water is safe, though unsoftened water is preferable.