It is also important to properly maintain your septic system, otherwise the bacteria and some very nasty viruses can enter your well water. If the system is properly maintained, it will treat the waste water before the water reaches your well, but it it is not, you could end up with contaminated well water. The picture below should help better explain how this can occur.
For more information on how to properly maintain your septic system, go to: http://www.laundry-alternative.com/septic-system-maintenance/
As you may know from researching this topic, failing septic systems are a major financial and environmental problem in this country. Expensive septic repairs can often run from $5,000 to $20,000 or more and a large number of systems are failing throughout the country. For news stories related to failing septic systems and tightening regulations you can go to: http://www.laundry-alternative.com/failingseptic.htm