Are you keeping up with your maintenance on your septic tank?  Make sure to pump it out every 2 to 3 years.  If you are considering selling your home and have a septic, consider having a pre-inspection on your holding tanks and drainfield.  Guidelines have changed over the years and if you have any problems, it's best to be proactive and address them ahead of time.  If you need some contacts in regards to septic pumping and inpsections, feel free to contact me.