BLS metro-level wage data places Water and Wastewater Treatment Plant and System Operators pay in Louisville/Jefferson County, KY-IN at a median of $52,230 per year ($25.11/hr/hour), drawn from the OEWS May 2025 release for this Metropolitan Statistical Area. Compared to the national median of $60,020, Louisville/Jefferson County pays 13% below, which typically tracks with a lower local cost of living or smaller specialized-employer cluster. Approximately 530 water and wastewater treatment plant and system operatorss are employed across the Louisville/Jefferson County MSA in SOC 51-8031.

The Louisville/Jefferson County pay distribution spans from $35,640 at the 10th percentile to $79,740 at the 90th — a 2.2× 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 $46,020 and the 75th at $62,280, so half of Louisville/Jefferson County-based water and wastewater treatment plant and system operatorss 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 Louisville/Jefferson County, KY-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 KY data, and peer-metro comparisons — a median is a starting point, not a ceiling.