Do I Need a Water Softener if I'm on City Water in Idaho?

This is the most common misconception we hear: “I'm on city water, so it's already treated. Why would I need a softener?” It's a fair question. Here's the honest answer.

What City Water Treatment Actually Does

The City of Idaho Falls treats your water to make it safe to drink. That means eliminating bacteria, viruses, and other microbial contaminants that could make you sick. A small amount of chlorine is added as a precaution to protect against anything that might enter the system between the treatment facility and your tap.

That's important work, and Idaho Falls does it well. The city's water consistently meets or exceeds EPA and Idaho Department of Environmental Quality standards.

But here's what the treatment process does not do: it doesn't remove dissolved minerals. The calcium and magnesium that cause water hardness come from the Eastern Snake River Plain Aquifer — the underground source of Idaho Falls' water supply. As groundwater moves through basalt rock and limestone deep below the surface, it picks up those minerals naturally. They're not contaminants. They're not dangerous. And the city has no reason to remove them.

So what arrives at your faucet is water that's microbiologically safe — but still loaded with hardness minerals at 14 grains per gallon.

What 14 GPG Does to Your Home

The Water Quality Association classifies anything above 10.5 GPG as “very hard.” Idaho Falls exceeds that by a wide margin. Here's what that means in practical terms.

The stuff you can see: White scale buildup on your faucets and showerheads. Water spots on dishes and glasses no matter how much rinse aid you use. A chalky ring forming inside your toilet bowl. Soap that doesn't lather well. Skin that feels tight and dry after a shower. Hair that looks dull no matter what shampoo you try.

The stuff you can't see: This is where it gets expensive. Hard water coats the heating element inside your water heater with mineral scale. That insulating layer forces the heater to work up to 29% harder to reach the same temperature — which shows up on your energy bill every month. Over time, it cuts the heater's lifespan roughly in half. The same thing happens inside your dishwasher, washing machine, and any other appliance that heats water.

When You Don't Need a Water Softener

We're not in the business of selling people things they don't need, so here's when you can skip it:

Your building already has one. Some newer apartment complexes and condos in the Idaho Falls area have a whole-building water softener. If your water already feels soft and you don't see scale, you might be covered. A quick water test will confirm.

You're in one of Idaho's rare soft-water pockets. A few areas in the state have naturally softer water, typically where the source is surface water rather than deep aquifer. This is uncommon in Southeast Idaho, but it exists. Again — test first.

You're not on Idaho water. If you're reading this from Florida or the Pacific Northwest, your water is likely much softer and a softener may not be worth the investment. This article is specifically about Idaho conditions.

For everyone else on city water in Idaho Falls, Ammon, Rexburg, Pocatello, Blackfoot, Shelley, Rigby, or anywhere in Southeast Idaho drawing from the Snake River Plain Aquifer — yes, a water softener will make a noticeable difference in your daily life and save you money on appliances and energy over time.