The term, Perk Test or Perc Test,
is a short form of the term "percolation
test," which is a test to determine the suitability
of a property location for a septic drainage system.
A series of holes are drilled in which water is
placed. The rate at which the water is absorbed
into the surrounding soil is the percolation rate.
This rate, along with an estimate of the daily
rate of sewage flow will determine if the site
is suitable for a septic system.
For additional details of how Perk Tests
(Perc Tests) are done, see this
article by the University of Minnisota Extension
Service.
