How long does a water softener last, and when should I replace it?

Two kinds of numbers get mixed up when people ask this question: expected life and warranty length.

Expected life. The InterNACHI chart gives "Water Softener" a life of 20 years. For comparison, the same chart lists a conventional water heater at 6 to 12 years and a well pump at 15. It is a general estimate for a whole home, not a promise for a specific model. The chart also warns that the mineral content of water can shorten the life of water heaters and clog showerheads, which is the same hardness a softener is there to remove.

Warranty length. A warranty is not a lifespan. It is the period the maker will replace a defective part. Morton's manual for its M20 to M34 models says that for ten years "the salt storage tank and fiberglass mineral tank will not rust, corrode, leak, burst, or fail to perform to their specifications." For one year, "all other parts will be free of defects in material and workmanship." So the tanks carry the long coverage, and the valve, controller and other parts carry the short coverage. Other brands set their own terms, so read the warranty that came with yours.

That split is useful, and it shapes how to think about repairs. The tanks are usually the long-lived, low-drama part of a softener. The moving and electronic parts are where repairs tend to happen, and they are also the parts that can be swapped without replacing the whole unit.

The EPA WaterSense guide to selecting and maintaining a water softener lists the upkeep a unit needs. Skipping these is the most likely way to lose years.

• Salt level. Use salt pellets made for softeners, and "check salt levels every 4 to 6 weeks." The guide says not to let salt fall below one quarter full. If the tank runs out, the guide says the water will not soften and water and energy are wasted.
• Salt bridges. The guide describes a bridge as pellets that fuse together and leave a gap, so no brine forms. It advises against filling the tank to the top, and says a broom handle can break up a bridge, followed by a regeneration cycle. Our page on why a water softener stops working covers that fault in detail.
• Resin cleaning. The guide says the resin beads "need to be cleaned annually to maintain efficiency," using a cleaner and the steps in your manual.
• Brine tank cleaning. It suggests cleaning the brine tank "at least every few years" to remove mold or dirt buildup.
• Leak checks. The guide says to look at connection points, valves and drains from time to time. "A continuous trickle or flow of water to the drain could indicate a broken valve or other malfunction."

Our page on how to maintain a water softener turns those items into a schedule.

### Phoenix water makes the work harder

The City of Phoenix 2025 water quality report lists total hardness of 172 to 302 ppm, or 10 to 17.6 grains per gallon. That is very hard water, so a Valley softener regenerates often. More cycles means more wear on the valve and more salt used. It is a reason to keep the unit sized properly and maintained, not a reason to skip a softener. Our page on choosing the right size softener explains sizing.

The sources above do not give a repair-versus-replace rule, so what follows is our own advice, based on how the warranty and maintenance items divide up.

1. 1Start with the symptom. A softener that does not soften is often a salt problem, not a failed part. Check salt level and bridging first. Our page on how to tell if a softener is working shows how to test it.
2. 2Check the age and the warranty. If the unit is within its warranty, contact the maker before paying for anything. Under the Morton terms above, a failed valve or controller could fall in the one-year window, while a leaking tank could fall in the ten-year window. Your own paperwork controls.
3. 3Repair when one part failed and the tanks are sound. A worn valve, a stuck bypass or a failed controller is a part-level problem. The tanks and resin may have years left.
4. 4Replace when the tank itself leaks or cracks. A leaking mineral or brine tank is the covered failure in the Morton warranty for a reason. It is the part that holds everything, and it is not a practical repair.
5. 5Replace when repairs keep coming back. A second or third repair on a unit near the 20-year planning figure is a sign to price a new one.
6. 6Ask about efficiency. The EPA WaterSense guide says efficient softeners "can use 4 gallons of water or less per 1,000 grains of hardness removed." It also lists a salt efficiency of more than 3,350 grains of hardness exchanged per pound of salt, and says models certified to the voluntary efficiency rating under NSF/ANSI 44 meet those criteria. Ask any replacement quote whether the unit carries that certification, since an older unit may use more salt and water. A newer, efficient unit can lower running costs as well as replace a failing one.

### Signs the softener needs attention now

These are the things worth a call rather than a wait:

• Hard water returns even though the brine tank has salt in it and no bridge.
• A steady trickle runs to the drain when the unit is not regenerating.
• Water is pooling at the tank or the valve.
• The controller shows no power or an error that a reset does not clear.

The WaterSense guide points to the drain trickle as a possible broken valve.

A failing softener is a good moment to check what the house actually needs. Test the water at a tap, note how many people use it, and look at where the unit sits.

If the softener is failing, think about what you want the next one to do. Our page on whether a softener works with Arizona hard water explains what to expect in the Valley. If drinking water is the concern, water softener versus reverse osmosis shows why a softener does not replace a filter for drinking water. If you are weighing a salt-free unit, see whether a conditioner is the same as a softener. Some cities also require a plumbing permit for the work, as the Scottsdale permit page explains.

HQ Plumbing & Air is licensed and insured. We can look at a failing softener, tell you whether a repair makes sense, and quote a replacement if it does not. We offer free estimates and upfront pricing.