Above Ground Septic Tanks: A Review
In general, above-ground septic tanks (also called "holding tanks") are wastewater storage tanks which sit above the ground. Small, portable polyethylene tanks are made in 250 and 350 gallon sizes, and these are appropriate in some situations for temporary storage of sewage. Above-ground tanks may also be appropriate in water-front areas where below-ground storage and leaching is prohibited.
The Drawbacks of Sewage Holding Tanks
While holding tanks are occasionally used in seasonal cottages that don't have up-to-date plumbing options, permanent above-ground tanks are rarely used (at least in the United States). They suffer from a number of drawbacks:
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