Yes, softened water is safe to drink for most people, but sodium content and individual health conditions matter
Softened water is safe to drink straight from the tap in most households. The softening process removes minerals like calcium and magnesium by replacing them with sodium (salt), which does not make the water unsafe. However, the amount of sodium added depends on your water's hardness level and the type of softener you use, so some people need to pay attention to their intake.
The main concern is sodium content, not the softening process itself. A person on a sodium-restricted diet—typically those with high blood pressure, heart disease, or kidney problems—may need to limit softened water consumption or use an alternative source for drinking and cooking water. For everyone else, the sodium levels in softened water are generally well below amounts that cause health problems.
Key Takeaways
- Softened water is safe to drink because the softening process only swaps calcium and magnesium for sodium, which does not create harmful compounds.
- A water softener adds sodium in proportion to how hard your water is; harder water means more sodium in the softened result.
- People with high blood pressure, heart disease, or kidney conditions should check their softened water's sodium level before drinking it regularly.
- If sodium is a concern, you can install a reverse osmosis filter on your kitchen tap or use a separate unsoftened line for drinking water.
- Softened water is fine for cooking, making coffee and tea, and washing—the sodium content is not high enough to affect taste or food safety in most cases.
How much sodium ends up in softened water
The amount of sodium in softened water depends on how hard your water is to begin with. A water softener exchanges calcium and magnesium ions for sodium ions in a one-to-one chemical swap. If your water is only slightly hard, the softener adds very little sodium. If your water is very hard, the softener adds more.
As a rough guide, water hardness of 100 parts per million (ppm) of calcium carbonate typically results in about 23 mg of sodium per quart of softened water. Water hardness of 300 ppm results in about 69 mg of sodium per quart. The U.S. Environmental Protection Agency (EPA) does not set a limit for sodium in drinking water, but the recommended upper limit for sodium intake is 2,300 mg per day for adults. A quart of moderately softened water contributes a small fraction of that daily limit.
You can find out your water's hardness level by asking your water utility for a water quality report, or by testing it yourself with an inexpensive test kit from a hardware store. Once you know the hardness, you can calculate the sodium content or ask your softener installer to do so.
Who should avoid drinking softened water regularly
People with certain health conditions should consider limiting softened water intake or using an unsoftened source for drinking and cooking. This includes anyone with high blood pressure, congestive heart failure, kidney disease, or cirrhosis of the liver. These conditions make it harder for the body to regulate sodium, so even small increases in sodium intake can matter.
Infants under one year old should not drink softened water regularly. Their kidneys are still developing and cannot handle sodium the way adult kidneys do. If you have a water softener and an infant in the home, use bottled water or unsoftened water for formula and drinking.
If you fall into either category, talk to your doctor about your softened water before making it your main drinking source. Your doctor can tell you whether the sodium level in your specific water is a concern for your situation.
Testing your softened water's sodium content
The most straightforward way to know how much sodium is in your softened water is to have it tested. Your water utility may offer free testing, or you can send a sample to a certified lab. A basic water test costs between $25 and $75 and takes one to two weeks for results.
When you request a test, ask specifically for sodium content. The lab will report the result in milligrams per liter (mg/L) or parts per million (ppm)—these numbers are equivalent for sodium in water. Compare the result to your daily sodium limit and your doctor's recommendations.
If you do not want to wait for lab results, you can estimate sodium content using your water hardness number and the formula above, or ask your water softener company to calculate it based on your system's settings.
Alternatives if sodium is a concern
If your softened water contains more sodium than you want to drink, you have several options. The simplest is to install a reverse osmosis filter under your kitchen sink. This filter removes sodium along with other minerals and contaminants, producing water that is safe for drinking and cooking. Reverse osmosis filters cost $150 to $400 to install and require filter replacements every 6 to 12 months.
Another option is to run an unsoftened line to your kitchen tap. This means your water softener bypasses the cold-water line to your kitchen sink, so you get hard water there while the rest of the house gets softened water. This costs $200 to $500 to install but requires no ongoing maintenance. You will see some mineral buildup in your kettle and on faucets over time, but the water is safe to drink.
A third option is to use bottled water for drinking and cooking if your sodium intake needs to be very low. This is more expensive over time but gives you complete control over your sodium intake.
Softened water for cooking and other uses
Softened water works well for cooking, making coffee and tea, and washing dishes. The sodium content is not high enough to change the taste of food or beverages in most cases, and it does not affect food safety. In fact, softened water can improve some cooking tasks—it dissolves salt and seasonings more evenly, and it makes better coffee because the minerals that interfere with extraction are gone.
For laundry and bathing, softened water is actually preferable to hard water. It allows soap to lather better, requires less detergent, and leaves clothes and skin feeling softer. There is no health concern with bathing in softened water; your skin does not absorb sodium from water the way your digestive system does.
Frequently Asked Questions
Can I drink softened water every day?
Yes, most people can drink softened water every day without health problems. The sodium content is usually low enough that it does not affect overall sodium intake. However, if you have high blood pressure, heart disease, kidney problems, or are on a sodium-restricted diet, check with your doctor first or have your water tested to confirm the sodium level is acceptable for your situation.
Does softened water taste salty?
Softened water should not taste noticeably salty. The amount of sodium added is small—usually 20 to 100 mg per quart depending on water hardness. If your softened water tastes salty, it may indicate a problem with your softener, such as too much salt in the brine tank or a malfunction. Have your system checked by a technician.
Is softened water bad for your kidneys?
Softened water is not bad for healthy kidneys. The sodium content is low enough that healthy kidneys can regulate it without difficulty. However, if you have kidney disease, your kidneys may struggle to handle even small increases in sodium, so you should talk to your doctor or nephrologist before drinking softened water regularly.
What about softened water for pets?
Softened water is safe for dogs and cats to drink. The sodium content does not harm pets with normal kidney function. If your pet has kidney disease or heart disease, ask your veterinarian whether the sodium level in your softened water is a concern for their specific condition.
Can I use softened water to fill a humidifier or steam iron?
Yes, softened water is ideal for humidifiers and steam irons. Because it contains fewer minerals, it produces less white mineral buildup inside the appliance and extends the life of the equipment. This is one of the main benefits of water softening for household appliances.