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Drains | 5 min read

Why Is My Drain Slow? Common Causes and Easy Fixes

Slow drains are usually grease, hair, soap or a clog building up. Try hot water or a plunger first. Skip chemical cleaners.

By The Plumbing Co Team | Updated November 1, 2026
Why Is My Drain Slow? Common Causes and Easy Fixes
Quick answer: Slow drains are usually grease, hair, soap or a clog building up. Try hot water or a plunger first. Skip chemical cleaners.

A slow drain is a warning. Something is building up inside the pipe. Fix it early and you avoid a full block.

Kitchen sink Grease, food bits and soap stick to pipe walls. Over time the pipe gets narrow.

Bathroom sink and tub Hair and soap scum are the usual causes. A small drain strainer helps.

Toilet Too much paper or wipes can slow it. Never flush wipes, even if the package says flushable.

All drains slow at once This points to the main line. Roots or a build-up can be the cause.

Easy things to try - Pour hot (not boiling) water down the drain - Use a plunger with a good seal - Clean the strainer or pop-up stopper

What to avoid Chemical drain cleaners can harm pipes and are unsafe to handle. They also may not clear deep clogs.

When to call a plumber Call if the clog returns, if more than one drain is slow, or if you smell sewage. We use snakes, cameras and hydro jetting for deep cleaning. See our drain cleaning service.

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Common Questions: Why Is My Drain Slow? Common Causes and Easy Fixes

Can I use boiling water?

Hot water is fine. Boiling water can harm some pipes, especially PVC.

Why does my clog keep coming back?

The clog may be deeper in the line. A camera check shows where it forms.

Are chemical cleaners safe?

We do not suggest them. They can damage pipes and are hard on skin and eyes.

Why do all my drains run slowly?

A main line clog is a common cause.

How can I prevent clogs?

Use strainers, keep grease out of the sink and never flush wipes.

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