MO SB578

Establishes the "Port Improvement District Act" allowing port authorities to create special districts within their boundaries to fund specific improvement projects through voter-approved taxes.

Permits districts to levy real property taxes or sales and use taxes (up to 1%) on district property and businesses, with voter approval required through mail-in ballot elections conducted by election authorities.

Requires petitions to establish districts to be signed by property owners collectively owning more than 60% of real property in the proposed district and filed with circuit courts for certification.

Defines "qualified project costs" broadly to include environmental cleanup, energy efficiency, wetland preservation, historic preservation, and various port facility construction and maintenance expenses.

Requires port authorities forming districts to submit annual reports to state auditors and local officials detailing services provided, revenues collected, and expenditures made.