Water softeners have been in residential use for years. They protect appliances by removing minerals that cause them to break down more quickly. They also make skin and hair softer and soap more sudsy.
Do you need a whole-house water softening system? Let’s dive in.
What is hard water?
Hard water has high levels of minerals, mainly magnesium and calcium, picked up when water “percolates through deposits of limestone, chalk or gypsum” (Wikipedia).
Hard water is considered safe to drink. However, It may increase the prevalence of eczema and can make your skin and hair dry when you’re bathing with it.
It can also damage appliances over the long term. Hard water—especially hot hard water—causes limescale, a buildup of calcium carbonate that can clog pipes and build up on the inner surfaces of kettles, boilers, and other appliances and devices.
When did we start softening our water?
At the beginning of the last century, at the start of the Industrial Revolution, people started using certain forms of ion exchange to soften water. It was important to keep machinery free of the scaly buildup that comes from water with high amounts of dissolved minerals.
Early attempts involved the use of lime and soda ash before chemists discovered sulfonated coal as a softener in the 1920s and, later, sulfonated vinyl compounds. Those early vinyl compounds are very similar to the ones that are still in use today.
Who needs a water softener?
In Olympia, you’re not likely to need a water softener if you use city water. Like other cities in western Washington, city-supplied water in Olympia is soft. Water hardness is measured in grains per gallon (GPG). Water Hardness Lookup lists Olympia’s city water at 1.3 GPG (a GPG of 3.5 or lower is classified as soft).
In western Washington, people with wells are more likely than city residences to need a water softening system, though not every home with well water will need one.
Well water in western Washington varies so you’ll need to get your water tested. Water testing through Thurston County does not test for water hardness; they recommend having your well water tested through Vanguard Laboratory in Olympia.
If your water measures between 3.5 and 7 GPG, you have moderately hard water. Between 7 and 10.5 GPG indicates hard water and anything higher than 10.5 GPG is considered very hard (Consumer Reports).
If you have moderately hard water, you might want to consider water softening if your laundry never seems fresh, you’re seeing scale buildup or excessive soap scum, or if you’re experiencing other effects of hard water. If you have hard or very hard water, talk with a professional and look into a whole-house water softening system to see if your water’s level of hardness requires intervention to protect your appliances.
How do water softening systems work?
To soften water, systems use salt to remove magnesium and calcium from the water through a process called ion exchange that involves swapping compounds between a solid and a liquid. Ion exchange is by far the most common method used to soften water. The process can also be used to remove other specific minerals from water and is the most common way to soften residential water.
Reverse osmosis is a non-salt alternative to water softening and is basically a fine filtration system that’s available for whole-house systems or for a limited amount of drinking water.
Less common water softening methods involve the use of currents, resin beads, and radio waves, among others. Not all advertised water softening techniques are well studied or proven. Be sure you read about the various methods and look for proof that they work before investing your money.
What are the benefits of water softening?
If you have hard water, a whole-house water softening system can:
Extend the life of large and small household appliances by preventing limescale buildup. Less internal wear and tear means you save on repair and descaling costs and don’t have to replace appliances as often.
Make your hair and skin less dry. Soft water dissolves soap more thoroughly so you can more easily rinse shampoo and soap away. It also eliminates the minerals that cling to you after a shower or bath.
Get your goods cleaner. Soft water also cleans your dishes better; they emerge from the dishwasher with fewer spots and can more easily be cleaned by hand since soap foams better when it’s mixed with soft water. (Plus, you use a heck of a lot less dish soap.) Laundry ends up fluffier and softer, a boon for towels, sheets, and other linens.
Make your water heater more efficient. A 2017 study found that gas, electric, and tankless water heaters performed more effectively with softened than with unsoftened water. (The study itself is behind a paywall.)
Give you better water pressure. If your pipes are choked with limescale it makes it harder for water to flow freely, reducing your water pressure.
Environmental effects of water softening
Other than the ways you may personally benefit from installing a water softening system, you’ll want to gather information and consider its environmental effects.
When you have a water softener, chloride ends up in surface waters through the sewer system which can harm aquatic plants and wildlife.
Consumer Reports notes that “to reduce impact, installers might place softeners after the main shutoff and before indoor plumbing branches, so outdoor spigots and sprinkler lines bypass the system,” in order to keep chloride from making its way directly into the soil.
Should you soften your water?
Look into softening your water if you use well water in your home. Get it tested and if it’s hard—high in dissolved minerals—consult with a specialist who can help you decide if a water softening system is right for you.
Sources
A History of Softening, Peter Meyers, WC&P International, August 12, 2003 (accessed July 31, 2026)
Does Your Home Have Hard Water? Here’s What to Know About Water Softeners…, Jesse Will, Consumer Reports, Updated May 25, 2025 (accessed July 31, 2026)
Hard water, Wikipedia (accessed July 31, 2026)
Residential softening, University of Minnesota Water Resources Center (accessed July 31, 2026)
Water Hardness in Olympia, WA, Water Hardness Lookup (accessed July 31, 2026)
Water softeners help preserve the efficiency of water heaters, Diamond Crystal (accessed July 31, 2026)
Water Quality, City of Olympia (accessed July 31, 2026)