Sets clear posting rule: place signs at no more than 250 feet along property lines (1-inch letters, 50 sq in) to ban recreational trespass, aiding owners and enforcement.

Standardizes procedures to add/remove counties to drainage districts, tightens notices, and adds arbitration for disputes over county additions/removals and cost apportionments.

Public school employers may now use payroll systems to collect union dues, reversing the 2012 ban and restoring payroll deduction assistance for school employees.

HB 4909 tightens safeguards for guardians/conservators by requiring suitability findings, background checks, bonds, notice, professional supervision, and potential certification.