1. The board of trustees for the reorganized common sewer district shall let contracts for the construction of sewers and sewage treatment plants that will cost more than twenty-five thousand dollars, except in case of repairs or emergencies requiring prompt attention. Notice of the contract bid process shall be published in a newspaper of general circulation in the district. The board shall select the lowest responsible bidder in no less than twenty days following such publication. The board shall have the power and authority to reject any and all bids and readvertise the work.

2. The board of trustees also shall have the power to enter into agreements with persons or firms to provide professional services to the board, and the board shall adopt policies for procuring the services of such professionals. The provisions of sections 8.285 to 8.291 shall be applicable to the services of architects, engineers, and land surveyors unless the board of trustees adopts a formal procedure for the procurement of such services.