Frequently Asked Questions

Q: What is the difference between a Soil Evaluation and a Perc Test?
A: The first step in obtaining a septic permit is to conduct a soil evaluation. This involves sampling the soil at various depths and classifying it to the "soil series". A soil series is a group of soils that have similar characteristics based on the type of parent material that it was formed from. All of the soil series have unique properties, and have estimated absorption rates assigned to them. If a soil has an estimated absorption rate that is too slow, then perc tests may be necessary to determine the absorption rate. Once tested, if the results are in a favorable range (measured in minutes per inch), then that soil can be used for a septic field.

Q: When you come out and sample the soil, what are you looking for?
A: We bore holes to depths ranging from 48 to 72 inches, or until we encounter a restrictive horizon such as rock. As we bore down, we are looking at the textures to determine the clay content. Generally, if the clay content is too high, then the absorption rate is too slow. We also take note of the rock depths, and seasonal high water tables. This is important because septic drain fields have to have a minimum 1-2 ft. buffer between the trench bottom and rock, or a water table, if either exists. We determine if a seasonal high water table is present by observing the contrasting colors that result from iron oxidation and reduction in waterlogged soils.

What if the soil on my property is unfavorable for a septic system?
We initially evaluate the soil in the vicinity of your proposed home site. If we find unfavorable soil conditions, then we will look at other places on the property and try to find an area that will work. We advise the client when this is necessary. We also may consider soil improvement practices, or alternative septic systems in some cases.

Q: How long does it take you to complete the field work, and when can I expect a report?
A: A typical soil evaluation takes 1.5 to 2 hours depending on the soil conditions and vegetative cover. Once the field work is complete, the soil report will be ready to deliver the next day.

Q: Once I get your report, what's my next step?
A: The next step is to take the report to the local Environmental Health Specialist in your county. They will advise you according to the information on the soil report.

Q: How long is the report good for?
A: The soil report does not have an expiration date. You should be able to take it at any time to get a permit. However, if the soil conditions have changed on the property since the map was completed (ie., cutting or filling), then the property may need to be re-evaluated.

To Schedule an Appointment send us a request on our Contact us page, call (423) 716-2577 or email: davidmsoil@yahoo.com.