Plumbing service
Water softener installation
Short answer
A water softener removes the calcium and magnesium that make water hard, usually by ion exchange. It's worth considering when your water tests at moderate hardness or above and you're seeing scale on fixtures, shortened water heater life, or spotting. Size it from your water hardness and daily household use, and install it on the main line with a bypass valve and a drain.
Updated · Editorial team; not yet technically reviewed
Water Softener Installation at a glance
- Test first
- Your utility's water quality report lists hardness; well owners should test.
- Hardness units
- Grains per gallon (gpg) or mg/L; 1 gpg is about 17.1 mg/L.
- Install needs
- Main-line connection, bypass valve, drain for regeneration, and power for most units.
- Local rules
- Some communities restrict salt-based softener discharge. Check before buying.
How a softener works
Hard water passes through a tank of resin beads that hold sodium (or potassium) ions. The resin captures calcium and magnesium and releases sodium in their place. When the resin is saturated, the softener regenerates: it flushes the resin with brine from a salt tank and sends the rinse water to a drain. Modern demand-initiated units regenerate based on actual water use, which saves salt and water.
How hard is your water?
| Grains per gallon | mg/L as calcium carbonate | Description |
|---|---|---|
| Under 1 | Under 17.1 | Soft |
| 1–3.5 | 17.1–60 | Slightly hard |
| 3.5–7 | 60–120 | Moderately hard |
| 7–10.5 | 120–180 | Hard |
| Over 10.5 | Over 180 | Very hard |
Sizing
Find hardness
In grains per gallon. Add a little if the water has iron, per the manufacturer's guidance.
Estimate daily use
A common rule of thumb is about 75 gallons per person per day.
Multiply
Hardness × daily gallons = grains removed per day. Choose a unit that regenerates every several days at that load.
Alternatives and add-ons
- Salt-free conditioners (template-assisted crystallization) reduce scale formation but don't remove hardness minerals. Results vary, and they don't produce "soft" water.
- Reverse osmosis at the kitchen sink if you want lower-sodium drinking water after softening.
- [Filtration](/services/water-filtration-systems/) for chlorine, taste or specific contaminants; softeners don't address those.
What affects the cost
- Capacity, sized from your hardness and household use
- Softener type: single tank, twin tank, or salt-free conditioner
- Plumbing access to the main line and space near a drain and outlet
- Adding a bypass valve and loop so outdoor faucets can stay unsoftened
- Ongoing salt and maintenance
We don't publish prices; they vary by market. Get a written quote first.
Problems that lead to water softener installation
Common questions
Should outdoor faucets be connected to a water softener?
Usually not. Irrigation and outdoor use don't benefit, and it wastes salt and softener capacity. Installers often loop the softener so outdoor lines stay on hard water.
Does a water softener help my water heater?
Yes. Scale insulates the bottom of tank heaters and clogs tankless heat exchangers. Softened water reduces scale buildup.
Is softened water safe to drink?
For most people, yes. It adds some sodium in proportion to hardness. People on sodium-restricted diets can use potassium chloride or a separate drinking-water tap.