It is completely safe to use in septic and biocycle systems. Unlike many heavy duty general purpose cleaner/degreasers, Bio-Green is non-toxic and does not contain any harsh caustic, bleach or ammonia. Therefore it can safely be used on most washable surfaces, including garage floors, kitchen surfaces, BBQs/pergolas, housewashing, outdoor furniture etc. It is safe to use on painted surfaces. Bio-Green has its own natural citrus fragrance and is safer on skin than other heavy duty cleaners.