Flood waters can pose a number of health hazards, the following are links that may be helpful.
Flood Waters Toolkit: https://www.dhs.wisconsin.gov/publications/p0/p00631.pdf
Resources for Residents with Private Wells: https://dnr.wi.gov/topic/wells/flood.html
Resources for Businesses licensed by Public Health:
https://www.cdc.gov/nceh/ehs/docs/apc/apc_emergency_handbook_for_food_managers.pdf
Resources from the Wisconsin DNR: https://dnr.wi.gov/topic/waste/stormdebris.html