Can Pottery Go In The Dishwasher?
By Linda · · 7 min read
Most glazed pottery is dishwasher safe, as long as the clay was fired to full maturity and the glaze fits the piece properly. Fully vitrified stoneware and porcelain handle the dishwasher beautifully; low-fired earthenware, unglazed pieces, raku, and anything with overglaze decoration or metallic accents should be hand washed.
The quick test: if the piece is high-fired, fully glazed inside and out, and doesn’t absorb water through the bottom, it can almost certainly go in the dishwasher. When in doubt, wash it by hand. A minute at the sink is cheaper than a ruined mug.
Is Ceramic Dishwasher Safe? It Depends on Two Things
When people ask “is ceramic dishwasher safe,” the honest answer is that “ceramic” covers everything from a flowerpot to fine porcelain, and they don’t all behave the same. Two factors decide it:
1. How absorbent the clay body is. Clay fired to full maturity becomes vitrified, glass-like and nearly waterproof. Stoneware fired to cone 5–10 (roughly 2,167–2,345°F / 1,186–1,285°C) and porcelain fired to cone 10 absorb almost no water, so repeated wash cycles can’t soak in and weaken them. Earthenware fired around cone 06–04 (roughly 1,830–1,945°F / 1,000–1,060°C) stays porous, and porous clay slowly waterlogs in a dishwasher.
2. How well the glaze fits. A good glaze on pottery seals the surface and shrugs off detergent. A poorly fitted glaze develops crazing (a fine network of cracks), and dishwasher heat cycles make crazing worse. Water and detergent then work under the glaze and the surface dulls or flakes.
Commercial dinnerware is engineered for the dishwasher, which is why mass-produced plates survive years of daily cycles. Handmade pottery varies more, which is why the potter’s word matters (more on that below).
Dishwasher Safety by Pottery Type
| Type of pottery | Dishwasher safe? | Why |
|---|---|---|
| Glazed stoneware | Yes, usually | Vitrified, durable glaze; built for daily use |
| Porcelain (plain glazed) | Yes | Fully vitrified, very hard surface |
| Fine china / gold or metallic trim | Hand wash, or china cycle only | Detergent strips metallic decoration |
| Glazed earthenware | Risky, hand wash | Porous body absorbs water, glaze crazes |
| Unglazed pottery / bisqueware | No | Soaks up water and detergent, can crack |
| Terracotta | No | Highly porous; waterlogs and weakens |
| Raku | No | Low-fired, crackled, and not sealed |
| Vintage or hand-painted pieces | No | Old glazes may contain lead; decoration fades |
If you’re not sure which clay body you have, my guides on stoneware pottery and earthenware pottery explain how to tell them apart by weight, sound, and the look of the unglazed foot ring.
How to Tell If Your Pottery Is Dishwasher Safe
Check these in order:
- Look at the bottom. Commercial pieces are usually stamped “dishwasher safe.” A crossed-out dishwasher symbol means hand wash only.
- Ask the potter. For handmade work, the maker knows the clay body and firing temperature. Any potter selling functional ware should be able to answer in one sentence.
- Do the water test. Set the piece on a paper towel with a tablespoon of water pooled inside overnight. If the towel is damp in the morning, the clay is absorbent. Hand wash it.
- Inspect the glaze. Crazing (spider-web cracks), bare clay patches, or chips along the rim all mean the dishwasher will make things worse.
- Check the foot ring. An unglazed bottom is normal, but if that bare clay feels chalky and soft rather than dense and smooth, the piece is low-fired.
The water test is the same one I recommend in how to tell if pottery is food safe. Absorbency is the root problem for both food safety and dishwasher durability.
What Really Damages Pottery in the Dishwasher
Knowing the failure modes helps you judge borderline pieces:
- Thermal shock. The wash cycle blasts hot water, then the piece cools, then the heated dry blasts it again. Vitrified clay tolerates this; porous or crazed pieces develop hairline cracks. It’s the same stress that makes pottery break in the cold.
- Detergent abrasion. Dishwasher detergent is far more alkaline and abrasive than dish soap. Over hundreds of cycles it can etch soft glazes and strip overglaze decoration, decals, lusters, and gold trim.
- Waterlogging. Porous clay absorbs water through any unglazed surface. The piece gets heavier, weaker, and can grow mold or smell musty. A waterlogged piece that then goes in the microwave can crack or even burst, one more reason absorbent pottery doesn’t belong in either appliance (see is pottery microwave safe).
- Knocking and chipping. Handmade pieces rarely fit dishwasher racks the way commercial plates do. Most of the “dishwasher damage” I see is plain old rim chips from pieces rattling against each other.
- Lead leaching. Older glazed ware and some imported decorative pieces used lead glazes. Dishwasher heat and detergent accelerate lead release. Keep those pieces out of the dishwasher and off the dinner table entirely.
Settings and Loading Tips That Protect Pottery
If a piece is dishwasher safe, you can still extend its life:
- Use a normal or light cycle, not “pots and pans” or sanitize. Those cycles run hotter and longer than glazed ware needs.
- Skip heated dry when you can. Air drying removes one full thermal swing per wash.
- Load with space. One finger-width between pieces stops chipping. Keep mugs off the tines’ tips so they don’t rock.
- Top rack for anything precious. It’s farther from the heating element.
- Use a standard detergent without citrus additives. Lemon-scented formulas tend to be more aggressive on glaze.
- Don’t overdose detergent. More soap means more etching, not cleaner dishes.
When I Hand Wash Anyway
Even genuinely dishwasher-safe pottery gets hand washed in my kitchen if it’s irreplaceable. A handmade mug from a potter friend, a piece with hand-painted brushwork, anything with sentimental value. Warm water, mild dish soap, a soft sponge, done in a minute.
Hand washing is mandatory for raku (its crackle surface isn’t sealed; see is raku pottery food safe), for unglazed and terracotta pieces, and for anything vintage. For stubborn stains or built-up residue on glazed pieces, baking soda and a nylon scrubber work without scratching. I cover the full routine in how to clean glazed ceramic pottery.
What I Tell People Who Buy My Pottery
I fire my functional stoneware to cone 6 (about 2,232°F / 1,222°C) with liner glazes inside, and I tell buyers it’s dishwasher safe — because it is. But I also tell them the glaze will stay glossier longer with hand washing, and that the dishwasher is for convenience, not preservation.
If you bought a piece at a craft fair and can’t reach the maker, treat it as hand-wash-only unless it passes the water test and shows no crazing. That one habit prevents nearly every dishwasher disaster I get emails about.
FAQ
Is stoneware dishwasher safe?
Almost always, yes. Stoneware is fired to cone 5–10 (roughly 2,167–2,345°F / 1,186–1,285°C), which vitrifies the clay so it can’t absorb water. As long as the glaze is intact and uncrazed, glazed stoneware handles daily dishwasher use well.
Can I put porcelain in the dishwasher?
Plain glazed porcelain, yes. It’s the hardest, least absorbent ceramic there is. The exception is porcelain with gold, platinum, or hand-painted overglaze decoration: detergent will strip that over time, so hand wash it or use a gentle china cycle with no heated dry.
Can ceramic pots and pans go in the dishwasher?
Ceramic-glazed cookware (like enameled cast iron or stoneware bakers) is usually marked dishwasher safe, but hand washing keeps the coating slick longer. Ceramic nonstick skillets are a different product. Dishwasher detergent degrades that coating quickly, so wash those by hand regardless of the label.
Will the dishwasher dull the glaze on my pottery?
Over hundreds of cycles, it can. Alkaline detergent slowly etches softer glazes, especially matte finishes, and heated dry adds thermal stress. High-fired glossy glazes hold up best; hand washing keeps any glaze looking new longest.
Is unglazed pottery dishwasher safe?
No. Unglazed clay absorbs water and detergent, which weakens the piece and can leave a soapy taste and smell that never fully rinses out. Unglazed surfaces also raise food-safety questions on their own. I explain why in is unglazed pottery food safe.
How do I know if handmade pottery is dishwasher safe?
Ask the potter what cone it was fired to. Cone 5 or higher with a fully glazed interior is a good sign. If you can’t ask, do the overnight water test on a paper towel; any dampness underneath means hand wash only.