Why do I need a soil evaluation?

It is necessary to have suitable soil if the drainfield is to function properly. Simply speaking, the most suitable soil would be well-drained sandy soil. However, there is great variation in types of soils within Washtenaw County. It is essential that a careful check be made of soil and drainage conditions before planning the installation and use of on-site sewage systems. 

The occurrence of saturated soil, or ground water, is an important factor since the sewage systems drainfield must be installed in well drained soil, at least 2 feet above the highest ground water elevation, in order to function properly. In selecting a building site, factors such as soil drainage, permeability, topography and ground water must be considered and are best determined by a soil evaluation.

Show All Answers

1. Why do I need a soil evaluation?
2. Is a soil evaluation the same as having a "perk" test performed?
3. What do I need to do to have a soil evaluation performed?
4. How is the soil evaluation scheduled?
5. How is the soil evaluation performed, and what is the Sanitarian looking for during the evaluation?
6. Who determines the location for the test holes / sewage system?
7. Who needs to be present at the soil evaluation?
8. How long will a soil evaluation take?
9. What is a soil approval area?
10. How long is a soil evaluation valid?
11. What happens after the soil evaluation is completed?