How to Remove Water Stains from Black Quartz Countertops

Removing water stains from black quartz countertops can seem daunting, but with the right techniques and a little elbow grease, your countertops can look as good as new. Quartz is an extremely durable material, but it is still porous and susceptible to staining, especially from water. The good news is that these stains are only on the surface, so they can be removed with some simple cleaning methods.

What Causes Water Stains on Quartz?

Quartz countertops are made from ground natural stone and resin. The resin makes the countertop non-porous, so liquids don’t soak in. However, quartz still contains microscopic pores that can allow moisture in. When water sits on the surface, minerals from the water are left behind as the water evaporates. This causes a whitish, chalky stain on the dark countertop.

Hard water, water with high mineral content, is the biggest culprit for water stains on quartz. The minerals – calcium, magnesium, and silica – react with the quartz, bonding and leaving deposits behind. Other sources of stains include coffee, tea, juice, soap scum, vinegar, and alkaline cleaning solutions.

How to Remove Water Stains from Quartz Countertops

Try a Gentle Cleaner First

For light stains:

  • Mix a mild detergent like dish soap or Murphy’s Oil Soap with warm water. Use a soft sponge or microfiber cloth to gently clean the stain.
  • Rinse well and dry with a clean cloth. Repeat if needed.
  • For hard water stains, use a vinegar-based cleaner. The acid in vinegar will help dissolve mineral deposits.
  • Spray on and let sit for a few minutes before wiping clean with a damp cloth.

Use a Poultice for Stubborn Stains

For deeper, more stubborn stains:

  • Make a poultice to draw out the stain. Mix a cleaning powder like Bar Keeper’s Friend or BonAmi with hydrogen peroxide to form a paste.
  • Apply the paste directly on the stain, cover with plastic wrap, and let sit for at least an hour. This will pull the stain out.
  • Rinse and dry the area thoroughly after removing the poultice.

Use a Quartz Polishing Kit

If stains persist after using cleaners and poultice, use a specially formulated quartz polishing kit. These contain mild abrasives along with stone polish to buff out stains:

  • Apply the polishing cream with a soft cloth and rub in a circular motion.
  • Start with light pressure, and increase as needed.
  • Rinse and dry thoroughly afterward.

Call a Professional for Stubborn Stains

For really stubborn stains that won’t budge, call in a professional stone restoration company. They have commercial-grade tools and chemicals to remove stains without damaging the quartz. This includes:

  • Grinding with a handheld rotary tool and diamond pads.
  • Sanding to smooth and polish.
  • Oxalic or phosphoric acid treatments to dissolve mineral deposits.
  • Hydrogen peroxide to whiten and brighten.

Professionals can restore the countertops without harming the finish or integrity of the stone.

Tips to Prevent Water Stains on Quartz

Prevention is the best way to keep quartz countertops looking pristine:

  • Wipe up spills immediately, don’t let moisture sit.
  • Use coasters under glasses and bottles.
  • Apply stone sealers regularly to protect from moisture damage.
  • Avoid using alkaline cleaners and citrus products which can etch quartz.
  • Install a water filtration system to minimize mineral deposits from hard water.

With proper care and prompt attention, water stains don’t stand a chance against the durability and beauty of quartz countertops. A little time and effort can keep them looking like new for years to come.

Frequently Asked Questions About Water Stains on Quartz Countertops

How do you remove dried water spots from quartz?

Use a gentle cleaner like dish soap, vinegar or a stone cleaner to break up the mineral deposits. For stubborn stains, make a poultice with powdered cleaner and hydrogen peroxide and let it sit to draw out the stain.

Why does my quartz countertop stain so easily?

Quartz contains microscopic pores that allow moisture in. Minerals from water cause a chalky stain on the surface as the water evaporates. Hard water with high mineral content is the biggest culprit.

Can I use Magic Eraser on quartz countertops?

Yes, Magic Eraser sponges can be safely used on quartz. The melamine foam is a mild abrasive that can remove many stains without damaging the finish. Be sure to wring it out well so it’s just barely damp.

Does quartz need to be sealed?

Sealing is not required, but it can help protect the surface from stains. Quartz is nonporous, but sealers fill in microscopic pores that allow moisture in. Reapply sealer every 1-2 years for protection.

How do you clean quartz countertops without leaving streaks?

Always use a soft, lint-free cloth when cleaning quartz. Microfiber cloths work well. Buff the surface in a circular motion, rinsing the cloth frequently. Wipe any cleaning products off thoroughly to avoid streaks.


Black quartz countertops are gorgeous, but also prone to show water stains if not cared for properly. Thankfully, these stains are only superficial and can be removed with a little bit of cleaning effort. Using the right methods and products, such as vinegar, poultices, and polishing kits, you can erase these mineral deposits and restore the countertops’ rich, dark beauty. With prompt cleanup of spills and regular sealing, you can prevent water stains on quartz and keep the surfaces looking fantastic. With some time and elbow grease, you can banish those pesky water stains for good.