Madison occupies an isthmus between Lake Mendota and Lake Monona, and Dane County averages 45 to 55 inches of annual snowfall. Spring snowmelt produces combined sewer overflows in Willy Street, Marquette, and Tenney-Lapham neighborhoods. The June 2018 storm dropped 6 to 8 inches of rain in under 12 hours, causing an estimated $40 million in damage.
Sump pump failure is Madison's most common water damage cause — power outages during peak runoff and overwhelmed capacity are both documented contributors. Roughly 40 percent of Madison's housing predates 1960, with cast-iron drains susceptible to backup and FEMA Zone AE designations along the Yahara River corridor.
Wisconsin homeowners insurance excludes surface water and groundwater flood damage, requiring a separate NFIP policy for mortgaged properties in Dane County flood zones. Ask your contractor for IICRC S500 certification and Xactimate-format documentation. Call for 24/7 certified emergency response now.