Water Softener Benefits: Is a Softener Worth It?
Quick answer: if your water is hard (above about 7 grains per gallon), a softener is usually worth it. The best-supported benefits are less scale in pipes, fixtures and water heaters, less soap scum, fewer spots on dishes, and needing less soap and detergent. Some of the strongest numbers come from studies funded by the water treatment industry, which we flag below. Softer skin isn’t proven: a large trial found softeners didn’t help children’s eczema. The downsides are cost, salt, a little added sodium, regeneration water and upkeep. If your water is soft, or you can’t have a drain or salt, you probably don’t need one. The checker below gives a quick answer for your home.
Water softener benefits, and the evidence for each
| Benefit and evidence | What the evidence says |
|---|---|
| Less scale in pipes and fixtures Strong | Hard water forms scale that can plug fixtures, says North Dakota State University (NDSU) Extension. In a Battelle study, hard water could make a showerhead stop working within months. |
| A more efficient water heater Good, industry-funded | NDSU says scale buildup slows heating and takes more energy. In the Battelle study, tankless heaters on 26 gpg water lost about 10% of their efficiency in two years of simulated use; those on softened water lost none. |
| Less soap and detergent Good, industry-funded | Hardness combines with soap to form scum and cuts detergents’ cleaning power, says NDSU. An industry-funded study found softened water let laundry detergent be cut by half, with washing at 60°F instead of 100°F, for the same or better stain removal. |
| Fewer spots on dishes Good | NDSU notes that glassware washed in hard water in a dishwasher may be spotted when dry. The same detergent study found dishwashers on softened water needed nearly 30% less detergent than on 10 gpg water. |
| Some iron removal Strong | NDSU says some softeners remove iron and manganese up to 10 ppm, which helps with orange and black stains. Check each model’s limit. |
| Softer skin and hair Not supported | A 2011 trial of 336 children with eczema in hard water areas found softeners gave no added benefit over usual care. We found no good studies on hair. |
Sources: NDSU Extension; the Battelle study for the Water Quality Research Foundation (WQRF) and Water Quality Association (WQA), reported in Water Conditioning & Purification; the WQRF detergent study by Scientific Services S/D (2011); Thomas et al., PLoS Medicine (2011).
About those studies
The Battelle and detergent studies were funded by WQRF, the research foundation linked to the Water Quality Association, the water treatment industry’s trade group, so treat the exact numbers with some caution; we didn’t find independent repeats. The basic effects, though, are well established: hard water leaves scale, makes soap scum and spots glassware, which NDSU, a university extension service, describes without any industry tie. The eczema trial was independent and found no benefit.
The honest downsides
| Downside | Details |
|---|---|
| Upfront cost | About $500–$1,700 for a typical salt-based softener, plus $500–$700 for standard professional installation, according to This Old House. See our cost guide. |
| Salt | About $5–$10 a month (This Old House), and someone has to lift the bags. |
| A little added sodium | About 8 mg per liter for every grain per gallon removed, says NDSU. Potassium chloride avoids it but costs more. See is softened water safe to drink? |
| Water for regeneration | Roughly 21 to 44 gallons per regeneration on the softeners we’ve covered; see regeneration. |
| Brine discharge | Some communities restrict salt-based softeners, such as Santa Clarita, California, and NDSU warns regeneration water can overload small septic systems. |
| Upkeep | Checking salt every few weeks, occasional cleaning and, eventually, new resin; see how long softeners last. |
| It doesn’t filter | A softener removes hardness, not chlorine, bacteria or most chemicals. For those you need a filter; see softener vs filter. |
| The slippery feel | Softened water can feel slippery on skin; Aquasana notes that its salt-free systems don’t have that feel, which some buyers prefer. |
From This Old House’s 2026 cost guide, NDSU Extension, the makers’ manuals and our earlier guides.
Do you need a water softener?
Start with your water’s hardness. The U.S. Geological Survey calls water above 120 mg/L (about 7 gpg) hard and above 180 mg/L (about 10.5 gpg) very hard, and NDSU notes that consumers believe they have a problem once hardness passes 6 to 7 gpg. On city water, your utility’s yearly water quality report usually lists hardness; on a well, test it. Our testing guide covers strips and kits.
The signs of hard water, according to NDSU, are soap scum, spotted glassware from the dishwasher and scale on fixtures. If you see those and your water tests hard, a softener will help.
Do I need a water softener? Quick check
Answer what you know. Leave the hardness blank if you haven’t tested.
Answer the questions to see if you need a softener.
How it works: hardness bands follow the U.S. Geological Survey (soft up to 60 mg/L, moderately hard 61–120, hard above 120). The signs come from NDSU Extension. Your water test and your own priorities matter more than any checker.
Do I need a water softener with city water?
Possibly. City water is treated to be safe to drink, which isn’t the same as soft, and hardness varies a lot by city. Check your utility’s water quality report; if it lists hardness above about 120 mg/L (7 gpg), a softener will make a difference.
Who doesn’t need a water softener
- Homes with soft water. Under about 60 mg/L (3.5 gpg), the USGS counts water as soft.
- Homes with no drain or where salt softeners are restricted. A salt-free system can protect pipes and heaters from scale without a drain or salt, though it won’t soften; see salt-free systems.
- Renters. You’ll need your landlord’s permission; see small and portable options.
- People on a sodium-restricted diet who won’t use potassium chloride. Keep a hard water tap for drinking, or add reverse osmosis at the kitchen sink; see softener vs RO.
Is a water softener worth it?
For most homes with hard water, yes. A salt-based softener should last about 20 years with maintenance, according to This Old House, which spreads the upfront cost thin. Against that you weigh salt at roughly $60–$120 a year, and on the plus side less scale, less cleaning and less soap. A tankless water heater raises the stakes: Rinnai’s manual says hard water must be treated, and Noritz’s warranty excludes damage from water above 12 gpg; see softeners for tankless heaters. To run your own numbers, use the calculator in our cost guide, then size one with our size calculator.
Pros and cons at a glance
| Pros | Cons |
|---|---|
| Less scale on fixtures, pipes and water heaters | $500–$1,700 upfront, plus installation |
| Less soap scum and fewer spots on dishes | Salt costs and lifting bags |
| Less soap and detergent needed | Adds some sodium to the water |
| Removes some iron and manganese | Uses water to regenerate and needs a drain |
| Protects tankless heater warranties on hard water | Doesn’t remove chlorine or other contaminants |
Frequently asked questions
Do water softeners help with skin?
Not for eczema, according to the best evidence. A randomised trial of 336 children with moderate or severe eczema in hard water areas found that installing a softener gave no added benefit over usual care. Some people simply prefer how softened water feels.
Do water softeners make appliances last longer?
They prevent the scale that hurts water-using appliances: NDSU notes scale slows water heating, and Rinnai treats scale damage to its heat exchangers as a water quality problem not covered by its warranty. Exact life-extension figures come mostly from industry-funded studies.
Why is my water softener full of water?
Some water in the salt tank is normal on most softeners. If the tank is full to the top, the softener usually isn’t drawing brine, often because of a plugged nozzle and venturi or a kinked drain line. See our guide to water in the brine tank and our “is my softener working?” checker.
Is softened water safe to drink?
For most people, yes; it adds a little sodium. See is softened water safe to drink?
Salt-based or salt-free?
Only salt-based softeners actually remove hardness. Salt-free systems reduce scale without softening. See salt vs salt-free, or go straight to the best water softeners.
Related guides
- Best water softeners (all types)
- How much does a water softener cost?
- Is softened water safe to drink?
- How does a water softener work?
Sources
- NDSU Extension, Water Softening (Ion Exchange), WQ1031 (revised May 2022): effects of hard water, iron and manganese, sodium, potassium chloride and septic systems.
- Water Conditioning & Purification, Market water softening based on certified energy savings (May 2010): results of the Battelle study for WQRF and WQA.
- Water Online, Studies Show Washing With Softened Water… (March 2011): the WQRF detergent study by Scientific Services S/D.
- Thomas KS et al., A Randomised Controlled Trial of Ion-Exchange Water Softeners for the Treatment of Eczema in Children, PLoS Medicine (2011).
- This Old House, How Much Does a Water Softener Cost? (updated June 2026): prices, salt and lifespan.
- U.S. Geological Survey, Hardness of Water.
- City of Santa Clarita municipal code via eCode360.
- Rinnai RUS/RUCS installation manual and Noritz tankless limited warranty; see our tankless guide for links.