A softener leak rarely starts as a puddle. It starts as a crust of white salt on a fitting, a slightly darker ring on the cabinet floor, or a faint musty smell when you open the cabinet door. By the time water is pooling, the seal or fitting has usually been weeping for a while. The good news is that the early signs are easy to check, and most of them sit on the outside of the unit where you can see them without opening anything.
Where softener leaks usually start
Walk around the unit slowly with a flashlight and a dry paper towel. Check these spots in order.
The inlet and outlet connections where the supply pipes meet the control valve. Look for wet threads, a ring of mineral deposit, or drips that appear only when water is running elsewhere in the house.
The drain hose fitting and the drain line itself. A loose clamp or a cracked adapter can drip only during the rinse part of a cycle.
The brine line and its fitting near the top of the brine tank. This thin tube carries salt water into the resin tank during regeneration. A damp collar or a salt crust here is an early sign.
The base of the brine tank and the seam where the lid meets the tank. Water sitting in the bottom of the brine tank above its usual level is a warning.
The top of the resin tank, where the valve sits. A wet ring or a white film on the tank shell can mean a seal under the valve is weeping. A resin tank that looks bulged or feels soft should be treated as a service call, not a wait-and-see item.
Time the drip before you blame a fitting
A leak that only shows up during regeneration points to a different cause than one that shows up all the time. Write down what you see and when. Note whether the drip happens at a certain hour, during the rinse, or only when water is running somewhere else in the house. Take a photo of the wet spot with your phone so the technician sees the pattern, not just the puddle.
Shut the water off before you touch anything
If you see active dripping, close the water supply to the softener before you tighten a nut or move a clamp. If the unit has no separate shutoff, use the main water shutoff for the house. Find that shutoff before there is a leak, not during one. Keep a bucket and towels under the unit while you wait for a technician, and check the spot again after the next regeneration.
What you can tighten and what you should not open
A compression nut or hose clamp that has worked loose is a reasonable thing for a homeowner to snug, as long as the water is off and you do not force the threads. Do not open the resin tank, pull the valve, or replace a seal yourself. Those jobs involve pressurized parts and the tank contents, and they belong to the company that installed the unit or to a qualified service technician. If a fitting keeps weeping after a gentle snug, call for service and describe the exact location.
Ask three questions when you call
Ask what the repair would be covered under, who pays for water damage to the floor or cabinet, and whether the fitting in question was installed by that company or by someone else. Then ask that your photos and the location of the wet spot be attached to the service ticket. If you are still choosing a company, the rankings on the front page list the firms we cover, and the methodology page explains how we rate them.
Keep a short paper record
Keep a simple note on the fridge or in your service binder: the day you first saw the spot, what it looked like, and whether it grew. A small log is what lets a technician tell a loose clamp from a failing seal, and it gives you something concrete to point to if the first visit does not fix the problem.