Things Not to Put Down the Garbage Disposal When You Have a Septic System

Nonfood Items

• Septic tanks use bacteria and enzymes to break down wastewater and organic material. Sticking nonfood items such as coffee grinds, cat litter and paper products in the garbage disposal or down the drain will cause the septic system to lose capacity. Since the bacteria and enzymes cannot break the products down, they'll stay in the septic tank. Over time, this could cause overflow. When disposing of food, remove plastic wrappers and small paper stickers.

Grease

• The enzymes in a septic system can't easily break down grease and oil. Grease can also combine with other liquids, such as laundry detergent, and form a paste. The septic system will fill up quicker and may overflow. Place grease from meat fats and cooking oils in a sealed container in the trash.

Chemicals

• Chemicals in household cleaners or other products such as varnish and paint should never go down the drain or garbage disposal. Once inside the septic tank, these chemicals can kill bacteria the system needs. They also have the potential to make it past the septic tank and contaminate the groundwater. Instead of using the garbage disposal, dispose of these items properly, following the manufacturer's instructions.

Warnings

• Using a garbage disposal puts added strain on your septic system over time. The International Association of Home Inspectors says garbage disposals increase a septic system's workload and decrease its lifespan. If you use a garbage disposal, you may need to pump the septic tank more frequently to avoid problems.