The signs you already have hard water
Much of Northern Virginia, DC, and the Maryland suburbs draws from the Potomac and runs moderately hard. Your utility's published number is in your free water report, in grains per gallon, and a test strip at the kitchen faucet tells you if your house reads differently. New to hardness numbers? Here's what the scale means, and what each local utility publishes. Wondering what it's doing to your tank? Water heaters and hard water, and how often to flush a water heater on hard water.
What a softener does, and what it doesn't
One more local wrinkle: chloramine
DC-metro utilities disinfect with chloramine, it's why tap water here can smell like a swimming pool (here's why). A softener alone won't touch it. That's why softeners in this region are often installed as a combined unit with whole-home carbon filtration: the carbon stage handles chlorine/chloramine taste, odor, and disinfection byproducts at every tap, while the resin stage softens.
Weighing your options
| Option | Scale & appliances | Taste & odor | PFAS, nitrate, chromium-6, lead |
|---|---|---|---|
| Do nothing | ✗ scale keeps building | ✗ | ✗ |
| Softener | ✓ | ✗ | ✗ |
| Softener + whole-home carbon | ✓ | ✓ | ✗, needs Reverse Osmosis (RO) at the tap |
| Softener + carbon + Reverse Osmosis (RO) | ✓ | ✓ | ✓ at the drinking tap |
There's no one right answer, it depends on your hardness number, your water system's report, and what you care about. Start with the facts: your free water report and your utility's page, then check your own tap.
Common questions
How do I know what size softener I need?
Sizing comes from two numbers: your measured hardness (grains per gallon) and your household's water use. Oversizing wastes salt; undersizing wears out the resin. Your hardness comes from your water report or a test at the tap, and your water use comes from how many people and bathrooms the house has. Whoever sizes it should ask you both.
Salt-based vs. "salt-free", what's real?
Salt-based softeners actually remove hardness minerals. "Salt-free conditioners" change how minerals behave so they scale less, but the minerals stay in the water, results vary with water chemistry. Which one makes sense depends on your numbers, and sometimes the answer is neither.
Does softened water taste salty?
Properly sized, no, the sodium added is small. If you're sodium-sensitive, a Reverse Osmosis (RO) tap for drinking water removes it again at the glass.
What does it cost?
It depends on your home's plumbing, size, and hardness. Typical installed prices for Northern Virginia are laid out in our cost guide, so you can weigh your options before anyone comes out.
Hard water is already in your water heater
Every year on hard water leaves sediment in a tank and scale in a tankless. Flushing it out is the first step. A SwiftPro plumber drains and flushes the heater, then checks your supply hoses, shutoff valves, water pressure, drains, toilets and traps, with photos. $99, normally $199. Tankless descaling is $300, regularly $350. You pay after the visit.
Book a $99 water heater flush →Or start with the data: get your free water report by ZIP · browse all 58 local systems