Schedule regular maintenance.
Use liquid detergents.
Know the location of your septic tank and components.
Keep records of service or maintenance to your system.
Use environmentally safe products.
Use water sparingly and conserve. Avoid long showers and spread out laundry.
Divert roof drains and surface water away from septic systems.
Repair running toilets.
Dispose cigarette filters, feminine products, baby wipes, paper towels, cat litter, cooking grease or paint down drains or toilets.
Use drain cleaners - they kill "good" bacteria needed in your system to break down solids naturally.
Use powdered detergents. They don't break down and can re-solidify.
Do more than a couple loads of laundry a day.
Use a garbage disposal.
Allow anyone to drive or park over any part of the system.
Plant large shrubbery around your system including the lines running from your home. Roots can grow into the lines and tanks themselves and clog or destroy them.