Anaerobic septic systems are popular among homeowners because they're more affordable. However, some homeowners prefer aerobic septic systems because they're more efficient. The price difference between the two is steep, with anaerobic systems ranging from $3,000–$8,000 and aerobic systems ranging from $10,000–$20,000.

What is the cheapest septic tank? The cheapest option is a plastic septic tank, which typically cost $500–$2,500. These tanks are generally lighter, easier to install, and resistant to water corrosion. However, they are also more vulnerable to damage during installation.

Septic drain or leach field replacement costs $3,000 to $15,000, depending on the size, slope, soil type, location, and accessibility. Leach field rejuvenation or drain field repair costs $1,000 to $5,000 on average.