Many homeowners worry about the materials that go down their drains. If you don’t pay close attention to these materials, you could end up dumping materials down your drain that are harmful to your septic tank. In moderation, bleach will not harm your septic tank. However, there are many precautions that should be taken when exposing your septic system to bleach, as it can be very harmful. Read below to learn about the dangers of exposing your septic system to bleach.