A certified copy of the order of the board of directors including any lands within the operation of the district under the provisions of *this act shall be filed with the county assessor and with the county auditor of each county in which any part of such included lands is situated, and from and after the date of such filing such land shall be subject to all the obligations and entitled to all the privileges of lands within the operation of the district.

*Reviser's note: "This act" is codified as RCW 87.03.615 through 87.03.640.