If you have a septic system, routine maintenance is necessary to keep things working properly. How often you need your tank pumped depends on the size of your tank and the number of people in your household. Most systems require pumping every 2-3 years. If you have a garbage disposal, you may find that your tank needs pumped more often.
If you have a septic system, avoid using a garbage disposal altogether. Garbage disposals can increase the amount of solids in your septic tank by up to 50 percent.