Key Takeaways
- Rockville's Potomac River water is generally considered moderately hard.
- Minerals settle as scale buildup in water heaters, tankless units, aerators and showerheads.
- Yearly tank flushing and tankless descaling prevent most hard water damage.
- A water softener is optional. Maintenance usually matters more.
Where Rockville, MD's Water Comes From
Most homes inside Rockville city limits get their water from the City of Rockville, which treats water drawn from the Potomac River. Some neighborhoods are served by WSSC Water instead. Either way, river water picks up calcium and magnesium on its way downstream, and that's what makes water "hard." Potomac water is generally considered moderately hard. It's not extreme, but it's enough to leave its mark on plumbing over time.
Not sure who supplies your water? Look at your water bill. It will say City of Rockville or WSSC Water.
Signs of Hard Water in Your Home
- White or chalky crust on faucets, showerheads and glass shower doors
- Spots on dishes and glassware after the dishwasher
- Soap that doesn't lather well, and a film left on skin and tubs
- A water heater that pops, rumbles or takes longer to heat
- Weak flow from aerators and showerheads that improves after cleaning
What Hard Water Does to a Water Heater
When water is heated, minerals drop out and settle on the bottom of the tank as sediment. That layer insulates the water from the burner or element, so the heater works harder, uses more energy and wears out sooner. The popping sound is water trapped under the sediment boiling. Flushing the tank once a year clears it. If yours is already loud and old, see water heater repair.
Why Tankless Units Need Descaling
Tankless water heaters have narrow passages in the heat exchanger, and scale builds up there quickly. The result is error codes, lukewarm water and a shorter life. In Rockville, a yearly descaling flush is the single best thing you can do for a tankless unit. It's part of our tankless maintenance, and worth weighing when you choose a water heater.
Faucets, Showerheads and Fixtures
Scale clogs aerators and showerheads and wears out faucet cartridges early. Soak aerators and showerheads in white vinegar to dissolve buildup. When a faucet starts dripping or sticking, the cartridge is usually worn. See faucet repair.
Do You Need a Water Softener in Rockville, MD?
Not necessarily. A softener reduces scale throughout the house, and some homeowners love the feel of soft water. But it's an appliance with its own upkeep, and for moderately hard water, regular maintenance often does the job. Consider one if you have a tankless heater, lots of fixtures, or scale you're fighting constantly.
| Option | What it does | Best for |
|---|---|---|
| Yearly tank flush | Removes sediment | Every tank water heater |
| Tankless descaling | Clears scale from the heat exchanger | Every tankless unit |
| Vinegar soak | Dissolves scale on aerators and heads | Fixtures |
| Water softener | Reduces scale house-wide | Heavy scale, tankless homes |
Protecting Your Plumbing
A once-a-year visit covers the essentials: tank flush, relief valve test, anode rod check, tankless descaling and a look at fixtures. We do this for homes across Rockville, from Twinbrook to King Farm, and in nearby North Bethesda and Derwood.
