State guide
Wisconsin
Wisconsin regulates septic systems as Private Onsite Wastewater Treatment Systems, or POWTS, through the Department of Safety and Professional Services. Counties have the primary responsibility for inspections and most resident-facing sanitary permit work, while certified soil testers and licensed plumbers handle the site evaluation and design steps.
Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.
- Who regulates septic permits
- Wisconsin regulates onsite wastewater through the Department of Safety and Professional Services, with counties serving as the main local sanitary permitting and inspection offices for POWTS.
- Who can do the soil or perc test
- Official county and DSPS materials say the soil and site evaluation must be done by a Wisconsin Certified Soil Tester, while system design and sanitary permit application are handled by a Wisconsin licensed plumber; some plans may also involve architects or engineers.
- Official septic permit page
- Official page →
- State fee
- $100 State Fee
Official resources in Wisconsin
State program page covering plan review, permits, inspections, delegated counties, and forms.
Explains Wisconsin’s Soil Tester credential and points users to the official license systems and fee information.
Shows which counties have delegated authority for POWTS plan review.
County example with sanitary permit forms, soil tester list, online permit viewer, and local contact information.
Key facts for Wisconsin
- DSPS says counties have the primary responsibility to inspect POWTS, except state-owned projects.
- DSPS says permits are obtained through the local municipality or county covering the project location.
- Douglas County requires a soils evaluation by a certified soils tester for sanitary systems other than holding tanks.
- Langlade County says soil tests must be performed by a Certified Soil Tester licensed by Wisconsin.
- Langlade County says plans may be drawn by an architect, engineer, plumbing designer, or the master plumber installing the system.
- Sawyer County lists a $100 State Fee and a $450 total sanitary permit fee.
County septic and soil-evaluation offices in Wisconsin
| County office | city | phone | Details |
|---|---|---|---|
| Douglas County Zoning Office - New Sanitary System (POWTS) Installation Douglas | Superior | (715) 395-1341 | County page explains soils evaluation by a certified soils tester, plumber design submittal, and county inspection scheduling. |
| Sawyer County - Sanitation Sawyer | Hayward | 715-634-4866 | County page gives the sanitary permit process and publishes both soil-test review and sanitary permit fees. |
| Langlade County Land Records & Regulations - Sanitary Permits Langlade | Antigo | Not published* | County page lays out the sanitary permit process, CST soil-test requirement, and when state plan review is needed. |
| St. Croix County Community Development Department - Sanitary Program St. Croix | Hudson | 715-386-4680 | County page covers sanitary permits, inspection scheduling, and links to certified soil testers and plumber contact lists. |
| Calumet County Planning, Zoning and Land Information - Sanitation Calumet | Chilton | (920) 849-1442 | County page offers sanitary permit and soil-test submittals, permit viewer access, contractor lists, and fee schedule links. |
| Wisconsin DSPS - POWTS Program | Madison | Not published* | State program page for POWTS permits, delegated-agent review, inspections, and official forms. |
| Wisconsin DSPS - Soil Tester | Madison | 608-266-2112 | State profession page for Soil Tester credentials and renewal information. |
* Not published: the official page doesn't list it. Call the office to confirm before you rely on it.
What to do next
- Find out first whether your county is a DSPS delegated agent; that determines whether plan review stays local or also goes to DSPS.
- Hire a Wisconsin Certified Soil Tester for the soil and site evaluation and a Wisconsin licensed plumber for design and sanitary permit submittal.
- Ask the county for both the sanitary permit fee and any separate soil-test recording or review fee before ordering tests.
Not seeing your county office or county?
Not every county office publishes its rules online. Try these, in order:
- General Start with the statewide information above.
- Closest verified Nearest places where we have verified local data outside this state (distance from Wisconsin's population center, for comparison only):
- DeKalb County Health Department — Well & Septic, Illinois · about 125 miles
- Jackson County Environmental Health - Onsite Wastewater Treatment, Iowa · about 141 miles
- Cedar County Environmental Health - Septic, Iowa · about 172 miles
- Call to confirm Ask the official office.DSPS - Private Onsite Wastewater Treatment Systems (POWTS)
Website →Phone: (608) 266-2112 (as listed on that page, checked Oct 4, 2026)Your city or county office: Local governments →Not sure who handles it locally? USAGov's free help line, 1-844-872-4681, or the Wisconsin page on USA.gov can point you to the right office. - Know the current info? Tell us with a link to the official page.