Mo. Rev. Stat. § 250.232

Any city, town or village operating a sewerage system or waterworks that has the power to condemn land or other property within the city, town or village for right-of-way for trunk sewers or for any other improvement or structure deemed necessary or advisable in connection with the sewerage and treatment system shall also have the authority to enter upon private lands to survey land or other property before exercise of the condemnation powers.