Water softener not softening?

Spots on glasses and soap that won't lather mean the water is still hard. Most often the unit is out of salt, has a salt bridge, or was left in bypass. Check those first, since none of them needs a repair.

Not sure which one it is? Snap your water softener and we’ll narrow it down.

Is the brine tank full of water instead?

That's a different problem, and it has its own causes. Water softener brine tank full of water

Likely causes

Out of salt
Most commonEasy DIY
Lift the brine tank lid and look. If there's little or no salt left above the water line, the unit has nothing to make brine with, so it can't recharge the resin.
Salt bridge
CommonModerate DIY
The tank looks full of salt, but a hard crust has formed on top with empty space or water underneath. Press a broom handle gently on the top: if it hits a hard layer and there is a gap below, that's a bridge, and the salt above isn't dropping into the water.
Bypass valve left in bypass
CommonEasy DIY
Hard water is reaching the taps even though the unit seems to be working. The bypass valve at the back of the control head, or on the pipes beside it, is set to bypass, so water goes around the softener. This is easy to leave that way after servicing.
Clock or hardness setting wrong
CommonEasy DIY
The display is blinking or shows the wrong time, which often happens after a power outage, or the hardness setting has been changed or reset. The unit then regenerates at the wrong time or not enough.
Clogged injector or brine line
Less commonCall a pro
There's salt in the tank, but the water level in the brine tank never drops after a regeneration, so the unit isn't drawing brine. A blocked injector or brine line stops it.
Worn-out resin in an old unit
Less commonCall a pro
Salt, settings and bypass are all fine, but the water stays hard on a unit that is 10 years old or more. HomeAdvisor puts a softener's lifespan at 10 to 15 years.
Part: $500–1,700 (new single-tank softener, installed)

Quick checks

Low risk. Unplug the unit before opening the control head. Put the valve in bypass before you disconnect anything. Break up a salt bridge gently and don't puncture the tank. Salt bags are heavy, so lift carefully.

Lift the brine tank lid and check the salt level. If it's low, add salt. Bags are heavy, so lift with your legs or pour from a smaller scoop.
Look for a hard crust on top of the salt. If there is one, press gently with a broom handle to break it up, and don't puncture the tank wall or bottom.
Check the bypass valve is set to service, not bypass.
Look at the control head display. If it's blinking or the time is wrong, reset the time and check the hardness setting against your water.
After a regeneration, check whether the water level in the brine tank has dropped. If it hasn't, see water softener brine tank full of water.

Sharpen the read

Diagnose your water softener in seconds, for free

No account, no phone number. Fixology’s AI reads your photo and tells you what’s likely wrong, how worried to be, and whether it’s a DIY fix.

Snap one of these:

the brine tank with its lid off, showing the salt and water level
the control head display
the bypass valve
the drain line

Add a note or more photos next. Nobody calls you.

When to call a pro

Salt, settings and bypass are right but the water is still hard, the brine tank never draws down, or the unit is 10 years old or more and you're weighing a repair against a replacement. For a tank that's full of water, see water softener brine tank full of water. For upkeep, see the water softener guide.

Typical cost: HomeAdvisor puts water softener repair at an average of $553 ($162–978). A new single-tank ion-exchange softener installed runs $500–1,700. A softener lasts 10 to 15 years.

Sources: HomeAdvisor: Water softener repair cost (no update date shown), HomeAdvisor: Water softener installation cost (updated June 17, 2026)

After a scan, Fixology can also help you find pros near you.