Most people don’t realize these 25 things are dangerous to put down the sink | June 28, 2025

Most people don’t realize that certain common household items are dangerous to put down the sink. While it may seem convenient to wash away waste, many items can damage plumbing, clog pipes, or even harm the environment. Surprisingly, some things that appear harmless can cause lasting issues. So, before you send that waste down the drain, make sure it’s safe to do so.

Here are 25 things you should never put down the sink!

Harmful Effects of Putting Things Down the Sink

Improper disposal of certain materials can wreak havoc on your plumbing. Over time, these substances build up, clogging pipes and leading to expensive repairs. Beyond plumbing, improperly disposed materials can pollute the water supply and harm aquatic life. Protecting both your home and the environment starts with keeping these items out of your drain.

Common Household Items That Shouldn’t Go Down the Sink
Grease and Oil:
A common offender, grease and oil may be liquid when you pour them down the sink, but they solidify as they cool, creating blockages. These substances stick to pipes and trap other debris, forming “fatbergs” that are notoriously difficult to remove.

Fatty Foods:
Similar to grease, fatty foods like butter, lard, or cooking fats can clog drains. Even small amounts can gradually accumulate and lead to major plumbing issues.

Coffee Grounds:
Though small, coffee grounds don’t dissolve in water. Instead, they clump together, frequently causing blockages. Many plumbers cite coffee grounds as a leading cause of sink clogs.

Eggshells:
You might assume eggshells break down in the drain, but they don’t. Eggshells can mix with other materials, creating obstructions in your pipes.

Chemical Dangers

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