Aerobic systems are a more advanced type of on-site wastewater treatment. Unlike traditional (anaerobic) septic systems, aerobic systems introduce oxygen into the treatment process using an air pump or compressor. This added oxygen promotes the growth of aerobic bacteria, which break down waste more efficiently and produce a higher-quality effluent. Because of this enhanced treatment, aerobic systems are often used on smaller lots, in areas with poor soil conditions, or where environmental regulations are stricter. However, they require more maintenance, electricity, and periodic servicing to ensure proper operation.