Frequently Asked Questions When should septic systems be inspected? Conventional septic tank/soil absorption systems are the most common type of onsite system serving individuals in the U.S. It is in the homeowners' interest to have their septic systems inspected regularly, even when regulations do not require it. Septic systems serving restaurants or other businesses or institutions must be inspected more frequently than residential systems because they usually treat wastewater that is higher in strength and volume. It is especially important for homeowners to schedule annual inspections for new septic systems and systems that are new to them as users to monitor how quickly the layers of sludge and scum accumulate in the septic tank with normal use. If sludge scum layers are allowed to become thick, solid materials may flow from the septic tank into the soil absorption field, clogging the pipes and soil and causing the system to fail. Annual inspections help homeowners estimate precisely how often they need to have their septic tank pumped out to avoid this problem. Inspections can also uncover any cracks, flaws, or other problems with the system, and they can help homeowners find out if they are using their systems wisely. For example, inspections can reveal if food scraps, or other inappropriate items, are being washed down the drain regularly, or if too much water is being used, which can overburden systems. Property Transfers It is not unusual for regulations or lending institutions to require that onsite system inspections be performed within a given time of the sale or transfer of property. This requirement sometimes can be waived if the owner has kept detailed records of past system inspections and maintenance. For their own protection, consumers should insist on a thorough system inspection before purchasing a home, whether or not it is required by local regulations; and once the home is purchased, they should maintain detailed and up-to-date records of all system inspection and service visits. Major Changes and Repairs Homeowners often need to have their onsite systems inspected to obtain building permits for constructing home additions or adding new buildings to their property. An inspection determines whether the system will be affected by the new construction and if it will be able to handle any potential changes in the amount or strength of the wastewater from the extra rooms or additional occupants. Inspections also may be required before making system repairs and other changes to the property that can affect the system. Changes in the use of a property, for example, from seasonal to year-round occupancy or from residential to commercial use, also affect onsite systems and inspections are often required before such changes are approved. Return to FAQ's