If you’re interested in becoming a pre-qualified plumber, fill out and submit the Pre-qualified Plumber Application to the City’s Building Inspection Department located at the City/County Government Building at 160 South Macy Street.
Current Pre-Qualified Plumber/Contractors
| Business Name | Address | City, State | Phone Number |
| Mand Boring & Trenching | PO Box 1541 | Fond du Lac, WI | (920) 960-3635 |
| Mand Plumbing LLC. | PO Box 1341 | Fond du Lac, WI | (920) 924-4575 |
| Mark Mand Excavating, Inc. | W3620 County Rd WH | Malone, WI | (920) 921-4040 |
| Mies Rooter & Plumbing | N7333 Mosher Dr. | Fond du Lac, WI | (920) 922-7273 |
| R and R Plumbing LLC | PO Box 2284 | Oshkosh, WI | (920) 279-3949 |
| Wally Schmid Excavating Inc | 7821 Swiss rd | Oshkosh, WI | (920) 216-0241 |