Nothing in ss. 200.21 to 200.61 in any way limits or takes away any of the powers of any municipality located in the district, relating to the construction, extension or repair of local or sanitary sewers or drains except that all plans and specifications for the construction of any local or sanitary sewers or extensions thereof shall be submitted to and approved in writing by the district before the sewers are constructed.
Wis. Stat. § 200.63