Distilled vs Tap Water for Cleaning a Headstone
headstone cleanning in Florida | headstone cleaning in Pennsylvania
Last spring, I found my great-great-grandmother's headstone buried under a thicket of poison ivy and wild raspberry canes. Took me three hours just to get close enough to read the name: "Eleanor Whitfield, 1842–1911." The granite was mottled green with lichen and streaked with something brownish that might have been rust from a long-gone iron fence. I was so excited I almost grabbed the garden hose and started scrubbing. Good thing I stopped myself. I'd learned the hard way a few years earlier—cleaned a sandstone marker with tap water and a stiff brush, and ended up with a chalky white residue that looked worse than the grime. Big mistake. Took me a month to figure out how to fix it. So when I finally got to Eleanor's stone, I did something weird: I packed two five-gallon jugs of distilled water from the grocery store into my trunk. My neighbor thought I'd lost my mind. "Linda, it's just water," she said. Maybe. But not all water is created equal when you're dealing with something that's been sitting in a cemetary for over a century. Let me break down the difference between distilled and tap water for headstone cleaning—because I wish someone had told me this before I messed up that sandstone slab.
Tap Water: The Convenient (But Risky) Choice
Look, I get it. You're at the cemetery, you've got a bucket, you've got a sponge, and there's a spigot right there on the side of the maintenance shed. Tap water is free. It's easy. And for some headstones, it's totally fine. But here's the catch: tap water contains dissolved minerals—calcium, magnesium, iron, sometimes chlorine or fluoride depending on where you live. My town's water is hard as nails. I can see the scale buildup on my coffee pot after two weeks. When you wet a headstone with hard tap water and let it air dry, those minerals get left behind as a white film called efflorescence. On dark granite, it looks like a ghost. On limestone or marble, it can actually accelerate deterioration because the salts can wick into the porous stone and crystallize, causing spalling. I've seen it happen. Not pretty. That said, if you're cleaning a dense, non-porous stone like polished black granite, and you're rinsing thoroughly with plenty of tap water, you're probably fine. Just don't let it dry on the surface. I always follow up with a final rinse of distilled water on porous stones, even if I used tap for the main cleaning. Also, skip the hose nozzle spray—too much pressure can erode soft stone. Use a soft sponge or a natural bristle brush, and keep the flow gentle.
Distilled Water: The Gentle Giant (But It Costs Money)
Which One Should You Use? (My Practical Rule of Thumb)
Here's my blunt take: if you don't know what kind of stone you're cleaning, use distilled water. Period. It's the safest bet. If you're cleaning a modern granite monument with a polished finish, tap water is probably fine as long as you dry it with a microfiber cloth afterward to prevent water spots. But for anything historic, anything soft, anything with visible cracks or chips—go distilled. I've started keeping a five-gallon collapsible water jug in my car specifically for cemetery trips. I fill it with distilled at home, drive to the site, and use a battery-powered sprayer (the kind people use for weed killer) to apply it gently. Total big help. No heavy lifting, no spills. One more thing: never, ever use hot water on a cold headstone. The thermal shock can crack the stone. I learned that from an old headstone restorer I met at a workshop in Pennsylvania. Use cool or lukewarm water only. And always test a small inconspicuous spot first—both with tap and distilled—to see how the stone reacts. Some stones are more absorbent than others. Better safe than sorry.
Frequently Asked Questions
Q: Can I use tap water if I let it sit out overnight to let the chlorine evaporate?
A: That helps with chlorine, but it doesn't remove dissolved minerals like calcium and magnesium. Those minerals are what cause the white residue on stone. So no—letting tap water sit won't make it safe for porous headstones. You'd still get efflorescence. Use distilled for the final rinse at least.
Q: Is it okay to mix distilled water with a cleaner like D/2, or should I use tap water for the cleaner and distilled for the rinse?
A: I mix D/2 with distilled water for the whole proccess. Why introduce minerals in the cleaning step if you're going to rinse them off with distilled anyway? It's simpler to just use distilled for both. D/2 is a biological cleaner that works best with clean water anyway—tap water impurities can reduce it's effectiveness.
Q: What about rainwater? Is that as good as distilled?
A: Rainwater is naturally soft and low in minerals, but it's not as pure as distilled. It can pick up pollutants from the air (acid rain is real), and it might contain algae spores or dust. I wouldn't rely on it for cleaning a headstone unless it's an emergency. If you collect it in a clean container and it's been raining for a while, it's better than hard tap water, but distilled is still the gold standard.
Q: Can I use bottled spring water instead of distilled?
A: Spring water contains minerals—that's the whole point of spring water. It's basically fancy tap water. Don't use it. You want distilled or deionized water. Check the label: if it says "minerals added for taste," that's a hard pass. Stick with distilled from the store. It's usually in the aisle with the ironing supplies, not the drinking water section.
Q: How do I transport distilled water to the cemetery without a car?
A: I've been there. I used to take the bus to the cemetery with two one-gallon jugs in a backpack. It's doable but heavy. Another option: buy a collapsible water carrier (the kind campers use) and fill it at a friend's house near the cemetery. Or ask the cemetery office if they have a spigot—then bring a portable water filter like a Brita pitcher. It won't be distilled, but it'll remove most of the minerals. Better than straight tap water.