Amends the Cook County, Cook County Forest Preserve District, and Metropolitan Water Reclamation District (MWRD) Articles of the Illinois Pension Code. Provides that the employer shall provide a federal tax qualified pre-tax retirement plan otherwise allowed by State and federal law for each employee. Provides that the employer shall automatically enroll employees who become employees or after January 1, 2025 into a federal tax qualified pre-tax retirement plan. Provides for a default contribution amount; collective bargaining; a retirement savings committee; plan document; review of the plan document by the Public Pension Division of the Department of Insurance; and fees charged by the Public Pension Division of the Department of Insurance to the municipality. Amends the State Mandates Act to require implementation without reimbursement. Effective immediately.