Skip to main navigation Skip to content Skip to footer

Is Bleach Safe for Septic Tanks and Septic Systems?

Is bleach safe for septic systems? Find out whether or not using bleach in septic tanks and septic systems is septic safe or if bleach is bad for septic tanks.

More from Clorox experts
Get more for less with bundles

Tackle household messes with 10% off curated cleaning bundles or build your own.

Get more for less

Save 10% on curated cleaning bundles or build your own.


I use bleach in my white wash, but also have a septic tank. I need to be careful about how much bleach I use, so as not to kill the bacteria in the tank. We are a family of four adults, but have occasional invasions of germy little grandchildren. Any ideas?


I can put your mind at ease regarding using Clorox® Regular Bleach2 and your fear of harming your septic tank bacteria. As long as you use the recommended amount (3/4 cup per wash), the bulk of the sodium hypochlorite active will be broken down to salt and water while attacking the stains, soils and germs in the wash load. Any un-reacted hypochlorite will find lots of “things” to react with going down the pipes before it enters your septic tank field to be converted into salt and water. So as long as you’re not pouring a whole bottle down the drain, you have nothing to fear and those germy grandkids can have the cleanest, whitest clothes while visiting.