No person may do either of the following without written approval from the county drainage board:
Wis. Admin. Code Department of Agriculture, Trade and Consumer Protection ATCP 48.43
Under s. 88.92(1), Stats., a county drainage board may approve the connection of private drains to district drains, or the extension of private drains from district drains, and may establish conditions for approval. Under s. 88.92(2), Stats., a person who connects or extends a private drain, or removes a spoil pile, without drainage board approval is liable for damages incurred by the drainage district as a result of that action. "Damages" include payments that the drainage district would have received during the time that the illegal connection or extension existed if the territory drained by the illegal connection or extension had been subject to assessment.