Water from a softener is not safe to drink straight from the tap
No. You should not drink water directly from a water softener system. The softening process replaces hard minerals like calcium and magnesium with sodium (salt), which means softened water contains added sodium that makes it unsuitable for drinking. The amount varies depending on how hard your water is and how often the softener regenerates, but even moderately hard water can result in softened water with 100 to 200 milligrams of sodium per liter — far above what health authorities recommend for drinking water.
Water softeners are designed to protect your pipes, appliances, and fixtures from mineral buildup. They do this job well, but the trade-off is water that tastes salty and carries health risks for people on sodium-restricted diets, infants, and those with certain medical conditions. If you want soft water for washing and hard water for drinking, you need a separate system or a bypass.
Key Takeaways
- Softened water contains added sodium and should never be your primary drinking water source.
- People with high blood pressure, kidney disease, or on sodium-restricted diets face real health risks from drinking softened water regularly.
- The safest approach is to install a bypass line that sends unsoftened water to your kitchen tap while softening the rest of your home.
- If a bypass is not possible, a separate drinking water filter or reverse osmosis system removes sodium and other contaminants from softened water.
- Infants should never drink softened water because their kidneys cannot handle the sodium load.
Why softeners add sodium in the first place
Water softeners use an ion exchange process. Hard water passes through a tank filled with resin beads that are coated with sodium ions. The resin pulls calcium and magnesium out of the water and releases sodium in their place. This swap stops scale from building up inside your water heater, dishwasher, and pipes — but it leaves your drinking water saltier.
The harder your water is, the more sodium ends up in the softened water. If your water is very hard (above 15 grains per gallon), softened water can contain 200 to 300 milligrams of sodium per liter. The EPA does not set a legal limit for sodium in drinking water, but the agency recommends keeping it below 60 milligrams per liter for people watching their salt intake.
Who should avoid drinking 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 extra sodium can stress their systems. If you have a water softener and an infant in the home, use unsoftened water for formula and drinking.
People with high blood pressure, heart disease, or kidney disease face real risks. Doctors often recommend limiting sodium to 1,500 to 2,300 milligrams per day. Drinking softened water throughout the day adds up quickly and can make it harder to stay within those limits. If you have any of these conditions, talk to your doctor about whether softened water is safe for you.
People on sodium-restricted diets for any reason should avoid softened drinking water. This includes some people managing diabetes, liver disease, or taking certain medications. The sodium in softened water is not obvious the way salt in food is, so it is straightforward to exceed your target without realizing it.
The best solution: a bypass line to your kitchen
The simplest and most common fix is a bypass valve installed on your softener. This diverts unsoftened water directly to your kitchen sink and refrigerator while sending the rest of your home's water through the softener. You get soft water for showers, laundry, and dishes — where it prevents scale and soap scum — and hard water for drinking and cooking.
A bypass valve costs between $50 and $150 and takes a plumber 30 minutes to an hour to install. Many softeners come with a bypass already built in; you just need to have it connected. If you are renting or cannot modify your plumbing, this may not be an option, but it is worth asking your landlord or the person who installed the softener.
Reverse osmosis and other filters for softened water
If you cannot install a bypass, a reverse osmosis (RO) system under your kitchen sink removes sodium and other dissolved solids from softened water. These systems force water through a membrane so fine that it blocks salt molecules. A typical under-sink RO system costs $150 to $400 and produces drinking water that is safe for everyone in your household, including infants.
The downside is that RO systems waste water — they produce about one gallon of drinking water for every three gallons that go down the drain. They also require filter changes every 6 to 12 months, which adds to the cost. But if a bypass is not possible, RO is the most reliable way to remove sodium from softened water.
Pitcher filters and faucet-mounted filters do not remove sodium effectively. Distillation and deionization can work, but they are slower and more expensive than RO for most households.
What to do if you rent or cannot modify your system
If you live in a rental or cannot install a bypass or RO system, your options are limited but not zero. You can buy bottled water for drinking and cooking, which costs more but guarantees you are not consuming the extra sodium. Some people use a combination: bottled water for drinking and cooking, and softened tap water for everything else.
Another option is to ask your landlord or the building owner whether they would install a bypass or allow you to install a separate drinking water filter. Many landlords are willing to make this change because it protects their tenants' health and is a relatively inexpensive upgrade.
Testing your softened water's sodium content
If you want to know exactly how much sodium is in your softened water, you can have it tested. A water testing kit from a hardware store costs $15 to $30 and gives you a rough idea. For a precise measurement, contact your local health department or a certified water testing lab — costs range from $50 to $150 depending on how many contaminants they test for.
Knowing your sodium level helps you decide whether softened water is safe for you to drink. If your softener is new or recently serviced, the sodium level may be higher than normal for a few weeks while the system settles. Testing after the system has been running for a month gives you a more accurate picture.
Frequently Asked Questions
Can I drink softened water if I only have slightly hard water?
Even slightly hard water produces softened water with some added sodium. The amount is lower than with very hard water, but it is still above the recommended level for people on sodium-restricted diets or with certain health conditions. If your water hardness is below 7 grains per gallon, the sodium content may be acceptable for most people, but testing is the only way to know for sure.
Does boiling softened water remove the sodium?
No. Boiling removes some contaminants like bacteria, but it does not remove dissolved sodium. In fact, boiling can concentrate sodium because water evaporates while the salt stays behind. If you need to remove sodium, use a reverse osmosis system or a bypass line.
Is softened water safe for pets to drink?
Most pets tolerate softened water without problems, but pets with kidney disease or on sodium-restricted diets should drink unsoftened water. If your pet has any health condition, ask your veterinarian whether softened water is safe for them.
What if my softener uses potassium instead of sodium?
Potassium-based softeners are an alternative to sodium, and the water they produce is safer to drink for people on sodium-restricted diets. However, potassium softeners cost two to three times more than sodium softeners, and they are not recommended for people with kidney disease or taking certain medications that affect potassium levels. Talk to your doctor before choosing a potassium softener.
Can I turn off my softener when I need drinking water?
Technically yes, but it is not practical. Turning off the softener and waiting for unsoftened water to reach your tap takes time, and you would have to remember to do this every time you want a glass of water. A bypass line or separate drinking water filter is much more convenient.