White residue on faucets and cloudy shower glass? That is hard water.
The chalky crust on your faucet aerator and the film that comes back on the shower door a week after you clean it are calcium and magnesium carbonate. Cleaning removes the symptom. A softener removes the cause.
Signs you have it
- White or chalky buildup on faucets, showerheads and around drains
- Cloudy film on glass shower doors that returns within days
- Spots on dishes and glassware out of the dishwasher
- Stiff, scratchy towels and dull laundry
- A water heater that rumbles or pops when heating
What causes it
Water picks up dissolved calcium and magnesium from rock and soil. When it evaporates or is heated, those minerals come out of solution and stick to whatever is nearby. The more grains per gallon, the faster the buildup.
In the DMV specifically
Fairfax Water reports 5 to 10 grains per gallon, Arlington averages about 8, and Frederick runs higher because of limestone geology. Anything above 7 grains is classified as hard, which is why most DMV homes show scale within a year or two of new fixtures.
What fixes it
Recommended
Ion-exchange water softener
The only method that removes hardness minerals. A metered softener at the main line stops new scale everywhere in the house.
Also useful
Salt-free conditioner (partial)
Changes how minerals crystallize so they stick less. Reduces scale on heaters but does not remove spots or help dry skin. We install these when a customer specifically does not want salt.
Also useful
Descale what is already there
Existing buildup on fixtures comes off with vinegar or a citric-acid cleaner; the water heater may need a flush. After softening, it does not come back.
What does not work
- Fridge filters and pitchers (they do not touch hardness)
- Magnetic or electronic "descalers" clamped to the pipe (no credible evidence)
- Whole-home carbon filters alone (carbon treats chlorine, not minerals)
Related questions
How hard is my water?
Enter your ZIP code on the home page and we show your utility's reported hardness. Or send us a photo of a scaled faucet and we will tell you what we think.
Is hard water bad for my health?
No. Calcium and magnesium are nutrients. Hard water is a comfort and cost problem for skin, fixtures and appliances, not a safety problem.
What does it cost to fix?
A metered softener with catalytic carbon starts at $1,899 installed, or $2,499 with reverse osmosis for drinking water.