The short answer

10–15 yearstypical water softener lifespan

The band covers conventional salt-based ion-exchange softeners. The resin bed is the real clock: good resin reaches the top of the range in ordinary hard water, but chlorinated city water embrittles it faster, and iron-heavy well water fouls it faster still. Mechanically, it’s the control valve that fails — a valve rebuild is often worth doing once, but when a unit needs new resin and a new valve, the math usually says replace. The sneaky part is that softeners fail quietly: water still flows, it just stops being soft, and the scale moves downstream into your water heater and fixtures.

What shortens or extends its life

Shortens it

• Chlorinated city water degrading the resin bed year after year• Iron and sediment in well water coating and fouling the resin• Salt bridges — a hard crust in the tank that leaves the unit “regenerating” with no actual brine• Very hard water simply working the resin through more cycles

Extends it

• A carbon prefilter on chlorinated supply — it protects the resin, not just taste• Quality pellet salt and a yearly brine-tank clean-out• Resin cleaner a few times a year in iron country• Hardness settings matched to a real test, so it regenerates as often as needed and no more

Warning signs it’s failing

• Spots on dishes and scale on fixtures creeping back• Soap and shampoo not lathering the way they did• The salt level not dropping between refills — a bridge, or a unit that’s stopped cycling• Regeneration running constantly or getting stuck mid-cycle• Resin beads showing up in faucet aerators — a cracked distributor letting the bed escape

What replacement costs

$1,000–$3,500 installedfor a quality unit sized to the household; resin replacement alone is $300–$600 when the valve is still healthy. If a quote lands far above this range, you’re probably being sold capacity you don’t need — a $10 hardness test kit tells you what you actually require.

Maintenance that extends its life

Check the salt monthly

Keep the tank about half full — more salt isn’t better, it just bridges.

Break up salt bridges when the level stops moving

A broom handle down the tank walls; the crust can hold its shape over an empty void.

Clean the brine tank yearly

Dump, rinse, and refill — sludge at the bottom ends up in the valve.

Test your water hardness once a year

The only way to know the softener is actually working, not just running.