Septic tank pumping costs between 300 and 600 dollars on average depending on tank size location and accessibility. Larger tanks over 1500 gallons may cost up to 800 dollars. Difficult access conditions like buried lids or long distance from the driveway increase costs. Emergency pumping and weekend service carry premium rates. Many companies offer discounts for routine scheduled service. The cost is minimal compared to drain field replacement which can exceed 10000 dollars.