6 Things You Should Never Put Down Your Kitchen Drain

Many people flush anything down the drain. It seems like a quick, easy way to clean out your sink and get rid of waste. However, some of the things you are flushing down your drain could be doing serious damage to your pipes, and cause clogs as well as harm to the environment. It is important to know some of the things you should never put down your kitchen drain so you do not have to deal with a clogged drain or damage the environment.

Cooking Oil and Grease

Two of the worst things to pour down your drain are cooking oil and grease. Because they are liquid, it seems like they will not do any damage. However, grease and cooking oil create globs of fat that mix with the moisture in your pipes to solidify and clog up your system.


It seems obvious, but many people do not realize the damage that comes from washing bones down your drain. The blades of your garbage disposal are not strong enough to break down most bones to a size that is okay going down a drain. Fish bones are the only bones that are small enough to safely go down your drain.

Coffee Grounds

Washing coffee grounds down your drain, no matter how much, is bad for your pipes. They will clump up and cause buildup in the pipes that will block it. The city of Portland has a great compost system you can use to dispose of your grounds.


When mixed with water, flour becomes a firm and thick substance. Washing large amounts of flour down your drain will cause it to clog up your drain, because it will mix with the moisture in the pipes to create a thick paste.


We all pour expired milk down the drain. However, research has shown that pouring milk down your drain is terrible for the environment. It takes a lot of oxygen to break down milk, taking oxygen away from living organisms that need it to survive. Large amounts of milk have even been known to suffocate entire ecosystems.


Pouring medication down the drain also does serious damage to the environment. They are extremely toxic, contaminating lakes, affecting water supply and animals in the lakes.

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