Service the septic...tank every 3-5 years by a state certified septic pumper. If you have any questions about what companies are certified pumpers or your tank location, contact your local county environmental health office.
Use non-quilted toilet papers...quilted does not break down well. This can cause build up and backups. Non-quilted usually results in using larger quanity, yet still breaks down faster than quilted.
Using liquid
detergents...over powdered. Often times the powered detergent builds up and causes backup by clogging the inlet tee.
Conserve
water...fix any leaks, such as toilets, to avoid saturation of the fieldlines. A small leak may not seem like much, but over time can overload your lines, causing failure. If your not sure what toilet, add food color to the tank, walk away for a while, when you return, if the color is in the bowl, there is a leak!
Stagger wash loads...this will keep the system from overload. Wash throughout the week, rather than all in one day.
Divert any unnecessary water
away from your septic system...this will allow the system to process and clean only the water necessary.
Fill in any low areas...over the drainfield lines to avoid rain water from standing, causing the drainfield lines to become saturated and to work unnecessarily.