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Official sources checked August 29, 2026

Fond du Lac County, Wisconsin septic permits and requirements

Permitting authority

Fond du Lac County Code Enforcement Office — POWTS Program

Fond du Lac County Code Enforcement Office, 160 S. Macy Street, Fond du Lac, WI 54935; phone 920-929-3139; fax 920-929-7655.

Wisconsin POWTS framework

Wisconsin Department of Safety and Professional Services provides the statewide POWTS code framework, sanitary permit and soil/site evaluation forms, plan-review resources, and licensing requirements used with county administration. County requirements below add the local filing, inspection, maintenance, and jurisdiction details supported by official sources.

Confirm sewer service and project-specific approvals

A POWTS permit applies to onsite wastewater treatment. Public sewer availability, system type, wastewater design flow, remodeling or occupancy changes, and specialized treatment components can change the required review path. Confirm current county and Wisconsin DSPS requirements before construction, repair, replacement, or reconnection.

County Code Enforcement administers POWTS rules

Fond du Lac County states that its Code Enforcement Office administers the county Private Onsite Wastewater Treatment System ordinance. The county identifies Chapter 58 Article II together with Wisconsin SPS 381-387 and Wisconsin Statute Chapter 145 as the governing POWTS framework.

New construction needs a valid sanitary permit

County land-use permit instructions state that new construction served by a newly constructed POWTS must have a valid sanitary permit in connection with issuance of the county land-use permit. Additions served by an existing POWTS must identify the septic tank and disposal field and show separation from proposed construction.

Replacement systems use the sanitary-permit process

Fond du Lac County states that its Wisconsin Fund replacement-grant office will not accept a grant application until a State Sanitary Permit has been issued for installation of the replacement system, confirming that replacement work proceeds through the sanitary-permit process.

County maintenance interval is system-dependent

The county maintenance program states that, depending on septic-tank size, pumping is required on intervals ranging from one to three years. Owners receive county notices at the applicable interval rather than relying on a single universal schedule.

Maintenance reports are electronic

Fond du Lac County requires completed maintenance reports to be entered electronically by the service provider/pumper. The county no longer accepts mailed maintenance notices from providers or property owners for this program.

Official sources

SepticScope summarizes public-agency information for planning purposes. The permitting agency's current instructions control if they differ from this guide.