Wisconsin Plumbing Practice Test

The main idea here is that mixing stormwater (gravity) drains with clearwater drains before they reach the storm building drain is not allowed unless the proper authority approves it. The department—the agency that enforces plumbing codes—must review and grant approval for any exception. This ensures the modification meets code requirements, preserves the separation of drainage systems, prevents backflow or contamination risks, and confirms the discharge meets safety and public health standards. Other entities like the city council or health department don’t typically grant approvals for this plumbing arrangement, and the building owner cannot unilaterally authorize it.