For leach line testing (the most common type throughout most of the country), a minimum of three test holes are drilled, most commonly six to eight inches in diameter. Ideally, these should be drilled to different depths from three to six feet below the surface. For better, more conclusive results, five drill holes are used in a pattern of one hole at each corner of the proposed leach field and one test hole in the center. Testing of these holes will result in a value with units of minutes per inch. This value is then correlated to a predetermined county health code to establish the exact size of the leach field.
Testing for horizontal pits typically requires five to eight test holes drilled in a straight line, or along a common contour, from three to ten feet below the surface. Testing is identical to leach line testing, though the end result is a different type of septic system, established through a different calculation.
Vertical seepage pits are slightly different in testing methods due to their large size, but the basic testing method is essentially the same. A hole, typically three to four feet in diameter is drilled to a depth of twenty or thirty feet (depending on the local groundwater table), and a fire hose is used to fill the pit as quickly as possible, and then, again, its dissipation rate is observed. This rate is used to calculate the size and number of pits necessary for a viable septic system.
Finally, for leach line systems and horizontal seepage pits, a "deep hole" is drilled to find the water table or to approximately twelve feet (dry). Exact depths will again depend on local health codes. In the case of a vertical seepage pit, local groundwater data may be used, or if the drill hole reaches groundwater, the pit will be backfilled again according to county health codes.