How often should a Septic Tank be Pumped

This depends on the following:

  • Capacity of septic tank
  • Flow of wastewater
  • Volume of solids in wastewater

Volume of wastewater flow is determined by the type and frequency of common household activities. Water conservation practices in the home will help to limit the flow into the system. Use of an in-sink garbage disposal will increase the volume of solids and is best avoided. Care should be given to the type and amount of solids disposed of through a garbage disposal. Please note that biological and chemical septic tank additives are not necessary and do not eliminate the need for pumping.

 

The table below will give you a general idea of how often you should have your Septic Tank pumped.

 

Septic Tank Pumping Frequency in Years
Number of Occupants
  1 2 3 4 5 6 7 8 9 10
Tank-Gallons Pumping Frequency in Years
500 5.8 2.6 1.5 1.0 0.7 0.4 0.3 0.2 0.1 --
750 9.1 4.2 2.6 1.8 1.3 1.0 0.7 0.6 0.4 0.3
900 11.0 5.2 3.3 2.3 1.7 1.3 1.0 0.8 0.7 0.5
1000 12.4 5.9 3.7 2.6 2.0 1.5 1.2 1.0 0.8 0.7
1250 15.6 7.5 4.8 3.4 2.6 2.0 1.7 1.4 1.2 1.0
1500 18.9 9.1 5.9 4.2 3.3 2.6 2.1 1.8 1.5 1.3
1750 22.1 10.7 6.9 5.0 3.9 3.1 2.6 2.2 1.9 1.6
2000 25.4 12.4 8.0 5.9 4.5 3.7 3.1 2.6 2.2 2.0
2250 28.6 14.0 9.1 6.7 5.2 4.2 3.5 3.0 2.6 2.3
2500 30.9 15.6 10.2 7.5 5.9 4.8 4.0 3.5 3.0 2.6

 

Keep in mind that these are average numbers. You may need to have your tank pumped more or less frequently depending on how you use your system. The more solid matter you put in the more often you'll need to pump. It's better to err on the side of caution and pump too often than it is to wait too long and risk a fouled leach field. Having to replace your leach field is many times the cost of pumping.

When dealing with a clogged septic tank that needed pumped asap, Dan arrived sooner than expected and did the job professionally and quickly. He was excellent at getting back to us soon after we called, and always returned subsequent phone calls. He took the time to explain how everything works and provided useful advice. Highly recommended!

— rob b., Los Gatos, CA

 

(831) 335-0861 (831) 335-2972

 

YOUR FULL-SERVICE SEPTIC SYSTEM PROFESSIONAL - SERVING SANTA CRUZ COUNTY SINCE 1994