BLS metro-level wage data places Water and Wastewater Treatment Plant and System Operators pay in Joplin, MO-KS at a median of $49,750 per year ($23.92/hr/hour), drawn from the OEWS May 2025 release for this Metropolitan Statistical Area. Compared to the national median of $60,020, Joplin pays 17% below, which typically tracks with a lower local cost of living or smaller specialized-employer cluster. Approximately 100 water and wastewater treatment plant and system operatorss are employed across the Joplin MSA in SOC 51-8031.

The Joplin pay distribution spans from $34,930 at the 10th percentile to $66,380 at the 90th — a 1.9× 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 $40,350 and the 75th at $57,870, so half of Joplin-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 Joplin, MO-KS 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 MO data, and peer-metro comparisons — a median is a starting point, not a ceiling.