Missouri sits on limestone, and limestone makes hard water. This guide is written the way a good field manual is: identify the problem, learn the species of equipment, size it correctly, then choose who installs it. Rankings second, education first.
Field photographs courtesy of Jones Air & Water.
Six ways to buy a softener in Missouri, ranked against our stated editorial criteria: local accountability, testing before recommending, service coverage, product fit, installation practices, and transparency. The full scoring rubric is on our methodology page, and the footer of every page says who publishes this site.
Local option: Jones Air & Water is a family-owned water treatment company in the St. Louis area that starts with a free in-home water test. Call (636) 899-1040.
One of the most recognizable names in residential water treatment, Culligan has been in the water business since 1936 and operates through a network of local dealerships. Product lines span softeners, whole-home filtration, and drinking water systems, with service plans and salt delivery available through participating dealers.
Founded in Ohio in 1970, Kinetico is known for non-electric control valves powered by the movement of water itself, and for twin-tank designs that regenerate on demand so soft water remains available around the clock. Systems are sold and installed through authorized independent dealers.
EcoWater Systems traces its lineage to some of the earliest household water softening equipment in the United States, with roots going back to 1925. It manufactures softeners, conditioners, and filtration systems sold through a dealer network, and newer models offer app-based monitoring of salt levels and water use.
RainSoft, founded in 1953, manufactures water softeners, whole-house filtration, and drinking water systems sold through authorized dealers. The company emphasizes in-home water testing as part of its sales process and offers limited lifetime warranties on many softener models.
Hague Quality Water is a family-owned American manufacturer, building equipment in Ohio since 1960. It is best known for the WaterMax, a multi-compartment unit that combines softening and filtration in a single cabinet, sold and serviced through independent dealers.
Softener brands stocked at national home improvement retailers offer a self-directed path: pick a cabinet-style unit off the shelf, install it yourself or hire an installer, and manage your own maintenance. Water testing and sizing are up to you, so measure your hardness in grains per gallon before you buy, and read chapter five of our guide before cutting any pipe.
Seven chapters, condensed. The full buyer's guide runs well past two thousand words and is the better read before you spend real money. This is the trail map.
Much of the state sits on limestone and dolomite. Slightly acidic rainwater dissolves those carbonate rocks on its way underground, loading groundwater with calcium and magnesium. The result: water that commonly tests hard to very hard, and scale on everything it touches.
Read chapter oneIon exchange: resin beads trade sodium ions for the calcium and magnesium in your water, then periodically rinse themselves clean with brine. That regeneration cycle is the whole trick, and the salt in the brine tank is what keeps it running.
Read chapter twoPeople times gallons times grains. A four-person home on 18 grain water needs roughly 5,000 grains of softening a day, which points to a specific capacity class. Undersize it and it regenerates constantly; oversize it wildly and you waste money.
Read chapter threeSalt-free units are conditioners: they reduce scale but remove nothing. Only ion exchange makes water actually soft. Both have a place, and chapter four says plainly which place is which.
Read chapter fourA cut into the main line, a drain with a proper air gap, a power outlet, and settings programmed to your actual hardness. Codes and permit rules vary by Missouri municipality, which is where a licensed installer earns their fee.
Read chapter fiveSalt is the recurring cost: commonly one to three 40 pound bags a month. Add occasional resin cleaner, a brine tank cleanout every year or two, and eventual resin replacement after a decade or so of service.
Read chapter sixPrivate wells, iron or sulfur problems, older plumbing, no drain nearby, or any uncertainty about code: these are the field marks of a job that wants a professional. Chapter seven includes the questions to ask before you hire one.
Read chapter sevenNarrower editions of this same research, by county and by need. New chapters post here as they clear our data bar.
Common signs include white scale on faucets and showerheads, spotted glassware, soap that will not lather well, stiff laundry, and dry skin after showers. Much of Missouri sits on limestone and dolomite bedrock, so groundwater in the state commonly tests hard to very hard. A water test, either an in-home test or a mail-in lab kit, gives you an exact number in grains per gallon.
Multiply the number of people in your home by your approximate daily water use per person, then by your water hardness in grains per gallon. That gives your daily softening requirement in grains. Most households do well with a unit sized to regenerate about once or twice a week. Our buyer's guide walks through the full calculation with a worked example.
Salt-free systems are conditioners, not softeners. Most use template assisted crystallization to reduce scale buildup, and they can do that reasonably well, but they do not remove calcium and magnesium from the water. If you want measurably soft water, only ion exchange softening delivers it. Chapter four of our guide covers the honest trade-offs.
The main recurring cost is salt. A typical household goes through roughly one to three 40 pound bags per month depending on hardness and water use. Beyond salt, plan on occasional resin cleaner, a brine tank cleanout every year or two, and a professional checkup if performance slips. Chapter six of our guide covers general cost ranges.
A confident DIYer with plumbing experience can install one, but the job involves cutting into the main water line, running a drain line with a proper air gap, and meeting local plumbing code, which varies by Missouri municipality. Private wells, iron staining, or sulfur odor make professional sizing and installation the safer choice.
For most people, yes. Ion exchange adds a small amount of sodium, roughly 8 milligrams per liter for each grain per gallon of hardness removed. People on strict sodium-restricted diets sometimes keep an unsoftened kitchen tap, add a reverse osmosis drinking system, or regenerate with potassium chloride instead. Ask your doctor if you are unsure.
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A field guide describes the equipment. For the water it treats, we follow two newsrooms.
