BLS metro-level wage data places Geological Technicians, Except Hydrologic Technicians pay in Chicago-Naperville-Elgin, IL-IN at a median of $64,420 per year ($30.97/hr/hour), drawn from the OEWS May 2025 release for this Metropolitan Statistical Area. Compared to the national median of $53,350, Chicago-Naperville-Elgin pays +21% above, signaling either concentrated employer demand, a cost-of-living premium, or both.

The Chicago-Naperville-Elgin pay distribution spans from $42,950 at the 10th percentile to $85,960 at the 90th — a 2.0× spread that reflects experience tenure, specialization, employer size, and the difference between public-sector, nonprofit, and private-sector compensation inside the metro. The 25th percentile sits at $43,760 and the 75th at $85,960, so half of Chicago-Naperville-Elgin-based geological technicians, except hydrologic technicianss earn within that middle band.

Metro figures capture where you actually work, not just where you live — which matters for commuters. BLS draws metro boundaries from the OMB MSA definitions, so Chicago-Naperville-Elgin, IL-IN covers the central city plus outlying counties tied to the metro economically. Remember that OEWS wages reflect base pay only: employer-provided health insurance, retirement matches, stock options, signing bonuses, overtime, and tips are excluded and can add 20-40% to real total compensation. Before using this metro median as a negotiation anchor, triangulate against the same occupation's national profile (linked below), its state-wide IL data, and peer-metro comparisons — a median is a starting point, not a ceiling.