What does a water softener cost to maintain?

What the two publishers say it costs

This Old House itemises it. Fixr gives one number. Here they are side by side:

Our note, marked as ours, and it matters before you compare those last two rows. Fixr's $150 to $600 is not an annual figure. The same page says ion exchange and reverse osmosis systems need routine inspections every two or three years, which is the cycle that number describes. This Old House's $150 to $300 is explicitly annual. Setting them next to each other as if they were the same thing would make Fixr look expensive when it is measuring a longer interval.

Add up This Old House's own annual items and you get $310 to $620 a year, which is our arithmetic: $60 to $120 of salt at its stated monthly rate, plus $100 to $200 for the resin tank, plus $150 to $300 for the service. Filters are listed as an occasional replacement rather than an annual one, so we have left them out.

The salt figure does not match its own bag

This Old House gives the salt cost in one sentence: $5 to $10 per month for a 40-pound bag that lasts most households 6 to 8 weeks.

We checked that against itself, and this calculation is ours. A bag every 6 weeks is 8.67 bags a year; a bag every 8 weeks is 6.5. At $5 to $10 a bag that is $32.50 to $86.67 a year, which works out at $2.71 to $7.22 a month.

The sentence says $5 to $10 a month. Its own bag price and interval support $2.71 to $7.22. The two overlap only between $5 and $7.22, and the stated figure is higher at both ends.

Our reading. We are not calling this dishonest, and the difference is small in absolute terms. We point it out because salt is the one running cost people use to decide between a salt-based and a salt-free system, and the bag arithmetic is the version you can check at a hardware shop. If you want a number to plan with, use the bag: price one locally, divide by seven weeks, and you have your own figure.

Fixr prices the alternative medium: potassium chloride at $30 to $40, used in place of sodium in the same brine tank. Our regeneration page explains what the salt is actually doing in there, which is not softening the water.

What the service buys

This Old House is specific about what the annual professional visit includes: system cleaning, performance testing, and minor repairs.

Our reading, marked as ours. That third item is the one worth noticing, because it changes how you read the price. A $150 to $300 annual visit that absorbs minor repairs is not comparable to a $150 to $300 visit that bills them separately. Ask which you are being quoted. It is also the reason we have not built a separate repair cost page: on both publishers' accounts, routine repairs on a working softener are folded into servicing, and repairs large enough to be quoted on their own are usually the point at which replacement enters the conversation, which the next section covers.

Fixr describes the other arrangement: companies that supply salt and inspections on a contract, so that you do not have to think about upkeep, with repairs and added components charged on top.

Salt-free and magnetic systems cost less to run

This Old House: salt-free and magnetic systems usually have lower ongoing costs, but may not last as long or work as effectively in hard water conditions.

Our reading, marked as ours. That is a fair summary of the trade and it is worth holding next to the purchase price rather than against it. A system with no salt to buy and no brine tank to clean removes most of the items in the table above. Whether it removes the hardness is the separate question, and the answer depends on how hard your water is, which our water hardness page covers. Buying the cheaper running cost and keeping the scale is not a saving.

When maintenance stops being the right spend

This Old House lists the signs that a system should be replaced rather than serviced again:

• Frequent repairs. Regular maintenance is normal, but a system constantly breaking down is more cheaply replaced.
• Hard water symptoms returning. White, chalky limescale on taps and showerheads means it is no longer removing the minerals.
• Age. Citing the International Association of Certified Home Inspectors, most water softener systems last about 20 years.
• Reduced water pressure, as minerals clog the pipes and the resin beads.
• Rust, cracks or leaks on the unit itself.

Our reading, marked as ours. The 20-year figure is the useful one here, and it is the only lifespan either publisher attributes to a named body rather than leaving unsourced. Against it, the annual running cost we worked out above comes to several thousand dollars across a system's life, which is more than the machine. That is the real reason to price running costs before buying rather than after, and our water softener cost page covers the purchase side.

What to take from this

1. Budget the running cost annually, not as a one-off. On This Old House's own items it is $310 to $620 a year.
2. Fixr's $150 to $600 is a two to three year cycle, not a yearly bill. Do not compare the two directly.
3. Price your own salt. A bag, divided by seven weeks, beats either published monthly figure.
4. Ask whether minor repairs are in the service price. The same number means two different things.
5. Twenty years is the lifespan to plan against, and past it, servicing is usually the wrong spend.