FAQ

Septic Systems are considered to be on-site systems designed to safely dispose of biological sanitary waste. “Gray Water”, such as laundry waste, is a part of the waste system, but may not result in what is referred to as “biological” waste.

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It is necessary for the tank to operate full for water/solid separation. Solids remain in the tank or cesspool and water is leached out to the leaching field and/or absorption field.

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If the liquid effluent cannot soak into the soil surrounding the leach field, sewage may back up into the system and overflow into the house or puddle on the surface of the ground. There are several possible causes for this problem.

1. Poor soil conditions and Septic System FailuresFaulty design or installation of septic systems: A leaching system placed in unsuitable soil, a system that is too small for the house it serves, or an improperly constructed system that may lead to early failure.
2. Soil Clogging and Septic System FailuresIf sludge or scum is allowed to escape into the distribution box and from there into the leach field, the soil will quickly become clogged. If this happens, the liquid will no longer soak, or percolate, into the soil. This condition can be caused by broken baffles in the septic tank that allow sludge or scum to escape. Failure to have the tank pumped can also lead to a situation where the sludge and scum overwhelm the baffles.
3. High Water Table and Septic System FailuresDuring wet, or abnormally wet, seasons groundwater may rise into the leach field and force sewage upward to the ground surface. This condition may mean the system has to be reinstalled at a higher level. It may also be possible to intercept the high groundwater with a series of drains around the system called “curtain drains”.
4. Roots and Clogging of Septic System FailuresThe roots of trees and bushes planted too close to the system can sometimes enter and block the pipes of the system. Removal of the plants and clearing the pipes of the roots is usually required.
5. Physical Damage to Septic System Components Causing Septic FailuresTrucks or heavy equipment passing over the system can damage pipes and joints to the point of rendering the system inoperable. You should be aware of the location of the system and direct traffic to avoid such damage.

   

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You can expect a conventional septic system, such as that being described here, to last about 30 years. Some systems last much longer and some systems can fail earlier for reasons like those noted above. Other things can also affect the life of a septic system. For example, a system may have been providing satisfactory service for a previous owner for many years, only to fail shortly after you have bought the house.

If the previous owners were a working couple with children, the system was probably not heavily used; if yours is a family of six, the added load could push a marginal system over the edge and into failure.

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Sewage backup into the home is one possible sign of a failing system. However, backup can also be simply the result of a blockage somewhere between the house and the septic tank.

Another possible sign of failure is a smell of sewage outside the house. If this smell is more noticeable after a lot of water has been put into the system- multiple showers or several loads of laundry ( if the laundry waste discharges into the septic system), for example- this may be an indication that the leach field is failing. The smell may also be accompanied by a “spongy” feeling in some areas of the leach field, near the distribution box, or near the septic tank.

The “spongy” feeling may be caused by water and waste being pushed to or near ground level. If ponding water is also seen, this is called “breakthrough” and is an almost positive indication of failure of one or more parts of the system. This smell, however, can also originate at the plumbing vent. In either case, further investigation is warranted.

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A cesspool is a pit which acts as both a settling chamber for solids and a leaching system for liquids. The use of cesspools may overload the capacity of the soil to remove bacteria, viruses, and phosphorous, and to nitrify ammonia and organic nitrogen compounds. A conventional on-site system has a on-site tank where solids can settle and begin to degrade, a distribution box, and a soil absorption system (SAS) that further treats the effluent by removing some of the bacteria, viruses, phosphorous, and nitrogen.

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No. Only those cesspools that exhibit signs of hydraulic failure, are located extremely close to private or public supplies, or otherwise fail to protect or pose a threat to public health, safety or the environment will need to be upgraded. Also, cesspools must be upgraded prior to an increase in design flow.

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The regulations allow for the inspection to be done in the least intrusive manner possible. As part of the inspection process, a cesspool and septic tank must be pumped out and examined.

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Only inspectors and soil evaluators approved under the regulations can perform required system inspections and soil tests. A list of DEP-approved soil evaluators and system inspectors is available from your local board of health. Certified health officers, registered sanitarians, and professional engineers qualify automatically as system inspectors under the regulations, and their names may or may not appear on the DEP-approved list.

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The approval is good for 2 years after the inspection for sale of a home or transfer of title (different rules apply for “shared systems” and condominiums). If the system was inspected within three years of the sale and you have records proving that your system was pumped annually since that inspection, the approval should be acceptable.

If a system fails a required inspection, the inspector is required to submit the form to the local board of health within 30 days, and the homeowner must provide a copy to the buyer. The system must be repaired or upgrade within two years following inspection, regardless of whether the property is sold.