IL HB3654

Requires all new or replaced underground utility lines to be marked with detectable underground warning tape traceable by inductive locating, effective after the bill's enactment.

Mandates warning tape be buried minimum 6 inches deep or between 4-6 inches deep, positioned as close to ground surface as practicable.

Requires warning tape to use American Public Works Association color-coding standards matching the type of utility line being protected.

Maintains existing 48-hour marking requirement for utility facility owners upon receipt of excavation or demolition notice, with exemptions for sewer facilities under certain depth and project conditions in municipalities outside the 1,000,000+ population boundaries.

Allows utility operators to use combination of flags, stakes, and paint on non-paved surfaces when site and seasonal conditions warrant, with specified color codes for different utility types.