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Our View of Septic Tanks and Sewage Treatment SystemsOn-site sewage treatment systems (commonly known as septic systems) typically have a sewage tank and a drain field which are installed below grade. Effluent (liquids) runs from the tank into the drain field.Today, tanks are normally made of concrete or fiberglass and are either septic tanks or aerated tanks.Note - these are two distinctly different systems.

Types of TanksSeptic tanks rely on anaerobic (without oxygen) bacteria to partially treat the sewage. Aerated tanks include a motorwhich uses aerobic (oxygen using) bacteria to break down the organic portions of the sewage into simpler inorganic compounds. Compared to septic tanks, aerated tanks break down the sewage more rapidly, provide greater solids reduction and are relatively odor free.

What Does a Septic Tank Inspection Include?While septic tank inspections are not part of the standard home inspection, many inspectors have additional training and certification to provide this service. A qualified septic inspector will be looking at components of the system both inside andespecially outside the home. Inside, the inspector will determine whether all waste lines are properly discharging intoapproved waste systems. Outside, the inspector will need access (and permission from the seller) to open the treatment tank,examine the inlet and outlet baffles to determine the volume and check for cracking, corrosion or leakage. In addition to the

tank itself, the inspector will visually check the absorption field toensure there is proper drainage without leaking.

ImportantA common misconception is that if the aerator motor stops ormalfunctions, the aerated tank can function adequately as a septic tank-- not true. It is our perspective that all tanks aremade to perform for the purpose in which they were designed.Aerator motors should run continuously. If they stop working, thebreakdown of solids can be insufficient and could cause theonsite sewage system to fail.

Septic Tank “Do’s” and “Don'ts”Do have your tank pumped and system inspected regularly; normallytanks are pumped every 3-5 years. Use water-saving features infaucets, shower heads and toilets. Use biodegradable soaps and laundry detergents. Keep the use of your garbage disposal to a minimum. Don’t drive or park over any part of the system. Don’t planttrees or shrubbery in or near the drain field. Don’t use commercialseptic tank additives. Don’t flush coffee grounds, dental floss,disposable diapers, personal hygiene products, cigarette butts, papertowels, fats/grease, paints, varnishes, pesticides or waste oil into yourtank.

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