A: Thanks for asking. All our products, with the exception of antibacterial products, have been thoroughly evaluated to use in homes with septic tanks. As long as you follow the recommended amounts as directed, they will not damage the septic system (including aerated systems, aerobic systems, and non-aerobic systems) or plumbing system with a properly functioning septic tank. If you have any further questions, please give us a call at (800) 765-5516!