Yes, our products do not harm any of the necessary bacteria in septic systems. And, our plant-based laundry detergent formulas are cold-water ready, meaning you can use them in place of conventional cold water detergents. And, since most conventional laundry detergents have not been formulated for the new High Efficiency (HE) washing machines, you can use our plant-based laundry detergents as a proven plant-based laundry performance alternative.