A salty taste in tap water can be surprising because the water usually looks clear and smells normal. In St. Louis homes, the cause is often inside the house, but it can also come from the supply or a private well. This guide gives you a practical order of checks so you know what to look at first and when a lab test makes sense.
Start with what changed
Before you test anything, think about what changed recently. A salty taste that began after a water softener was installed, serviced, or reset points toward equipment inside the house. A taste that appeared during or after a winter with heavy road salt use, or after work on a nearby water main, may point toward the supply side. Write down the date you first noticed the taste and whether it is constant or comes and goes.
Check the water softener
A softener works by swapping hardness minerals for sodium, so softened water carries more sodium than untreated water. If your home has a softener, check these items:
- Confirm the brine tank has salt and that the salt is not bridged or packed into a solid crust.
- Check the control settings, including the regeneration schedule and the hardness setting, since a wrong setting can change how much sodium the water picks up.
- Look at the bypass valve. Some homes route softened water only to certain fixtures, so a bypass that is partly open can change which taps taste salty.
- Note when the unit last regenerated. A taste that follows a regeneration cycle is a useful clue.
If the softener controls or valves look wrong, or you are unsure how the system is plumbed, a qualified service technician can check it. Ask them to show you which fixtures receive softened water and how the bypass is set.
Compare fixtures and temperatures
Taste the water at several points in the house and write down what you find. This simple comparison often shows where the taste begins.
- Run the cold kitchen tap for a minute, then fill a clean glass and taste it.
- Taste water from a cold tap that is close to where the main line enters the house, such as a basement utility sink, if you have one.
- Taste water from an outdoor hose bib, which often sits on a different branch of the plumbing. Let it run until the water is cold before you taste it.
- Taste the hot tap at the kitchen sink. If hot water is salty and cold water is not, look at the water heater and the hot water branch.
If every tap tastes salty, the source is probably upstream of all the branches, such as the softener, the main supply, or the well. If only one or two taps taste salty, look at the plumbing and fixtures serving those taps, including any filter or treatment device on that line.
Test the water
Taste alone cannot tell you what is in the water. A certified lab can measure sodium and chloride, and those results are more useful than a guess. A handheld total dissolved solids meter can show that the overall mineral load changed, but it cannot tell you whether the change is sodium, chloride, or something else, so use it as a screening tool only.
If you are on public water, check your utility's annual water quality report. Reports often list sodium when it has been tested, and you can compare those results with what you taste at home. The report describes the supply at the treatment plant, not the water at your faucet, so it helps most when the taste appears at every tap.
If you have a private well, a lab test is the most direct option. Ask for sodium and chloride along with a basic panel. Test the water at a tap before any treatment equipment so you can see what the source contains. If the well is near a road that is salted in winter, or if the taste started after work on the well, mention that to the lab and to whoever helps you interpret the results.
When to take extra care
If anyone in your home follows a sodium-restricted diet, ask a doctor or pharmacist whether softened water is a concern for them. If they recommend it, use a cold tap that bypasses the softener for drinking and cooking. Do not change the bypass setting without first confirming which taps are connected to it.
A salty taste that is strong, new, or paired with other changes such as discolored water, a strong odor, or unusual sediment is worth a professional look. Stop using the tap for drinking until you know the cause and have results you trust.