A septic dye test is only for rural areas whereas cities are on municipal systems.  It is a relatively low cost, non-invasive method of testing of private sewage treatment systems.  It is a limited, performance based test.

  This test does not provide a guarantee of the present or future performance of the system.  It is not a full evaluation of a sewage treatment system, but nonetheless provides valuable information regarding the present performance of the system.

  A septic dye test is ideally suited for evaluation of septic systems for real estate sales purposes, since the test does not result in damage to the property, as would any excavation, and provides minimal disruption of the occupant's use of the home during the test.

  More comprehensive testing and evaluations are possible, and may be desirable, if greater assurance is needed.