Soil Tester (Private Onsite Wastewater Treatment)
Required for individuals who evaluate soil and site conditions for private onsite wastewater treatment systems (POWTS, commonly called septic systems) in Wisconsin. Soil testers determine what type of system a site can support.
How to Get a Soil Tester (Private Onsite Wastewater Treatment) in Wisconsin
| Issuing Body | WI DSPS |
| Initial Fee | $60 |
| Exam Required | Yes — Must pass the Soil Tester exam covering soil morphology, hydrology, site evaluation, Wisconsin SPS 383-385, and POWTS design principles. |
| Experience Required | Completion of approved soil evaluation training and at least 100 supervised soil evaluations, or a degree in soil science plus 50 supervised evaluations. |
| Application | Apply online → |
Continuing Education
Wisconsin requires 12 hours of continuing education every Biennially (even-numbered years, December 14) to renew your soil tester (private onsite wastewater treatment).
12 hours of approved continuing education per 2-year cycle covering soil science, wastewater treatment, and Wisconsin SPS 383-385.
License Lookup & Verification
Verify a soil tester (private onsite wastewater treatment) holder's credentials through the Wisconsin DSPS online license lookup tool.
Verify a License →Frequently Asked Questions — Soil Tester (Private Onsite Wastewater Treatment)
When do I need a soil test in Wisconsin?
A soil test (soil evaluation) is required before installing or replacing any private onsite wastewater treatment system (septic system). It determines the soil's ability to absorb and treat wastewater, which dictates what type of system can be installed.
How much does a soil test cost in Wisconsin?
Soil evaluations in Wisconsin typically cost $500-$1,200 depending on the site complexity, number of borings required, and location. This is a mandatory cost before any POWTS installation.
Who regulates septic systems in Wisconsin?
DSPS regulates the credentials of soil testers and POWTS installers. Counties administer permits and inspections for individual systems under the framework of SPS 383-385. Some counties have additional requirements beyond the state minimum.
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