7 Surprising Things You Should Never Put Down Your Kitchen Sink Drain

Introduction:

As a plumbing contractor in the Dallas Metroplex, I’ve seen it all—from minor clogs to full-blown kitchen disasters. The truth is, many homeowners unknowingly damage their plumbing by putting everyday items down the sink that seem harmless. Whether you have a garbage disposal or not, your kitchen drain isn’t a catch-all for waste. Here are seven surprising things you should never put down your sink—and what to do instead.

1. Coffee Grounds

They seem soft and harmless, but coffee grounds clump together in pipes, acting more like a paste than a liquid. Over time, they build up and contribute to stubborn clogs.

What to do instead: Toss them in the trash or compost—they’re great for gardens!

2. Eggshells

A common myth says eggshells “sharpen” your disposal blades. Not true. The membrane can wrap around blades, and the shells themselves grind into sand-like grit that clogs pipes.

What to do instead: Throw them in the trash or compost bin.

3. Grease, Oil, and Fat

This one’s a biggie. Grease might pour down as a liquid, but it cools and solidifies in your pipes, creating fatbergs that block water flow.

What to do instead: Pour grease into a jar or can, let it harden, then toss it in the trash.

4. Pasta and Rice

These expand when wet—yes, even in your pipes. They also become gummy and sticky, leading to slow drains or full clogs.

What to do instead: Scrape leftover pasta or rice into the trash before rinsing dishes.

5. Produce Stickers

They often slip down the drain unnoticed, but they don’t break down in water and can stick to pipes, trapping other debris.

What to do instead: Peel stickers off before rinsing fruit and toss them in the trash.

6. Stringy Vegetables (like celery or corn husks)

Fibrous veggies can wrap around disposal blades and slip past them, only to clog drains further down the line.

What to do instead: Compost or trash these instead of rinsing them down the sink.

7. Flour

Mix flour with water, and what do you get? Glue. That same paste forms in your pipes, coating the walls and catching other debris.

What to do instead: Wipe it into the trash before washing bowls or measuring cups.

Final Thoughts:

Your kitchen drain is tough, but it’s not indestructible. Avoiding these seven culprits can save you hundreds in plumbing repairs —and extend the life of your sink and disposal.

Need help with a clogged sink in Dallas?
Call Brooks Plumbing today or schedule service online. We’re fast, local, and we clean up better than we found it.