BLS metro-level wage data places Grinding, Lapping, Polishing, and Buffing Machine Tool Setters, Operators, and Tenders, Metal and Plastic pay in Riverside-San Bernardino-Ontario, CA at a median of $43,130 per year ($20.74/hr/hour), drawn from the OEWS May 2025 release for this Metropolitan Statistical Area. Compared to the national median of $46,550, Riverside-San Bernardino-Ontario pays 7% below, which typically tracks with a lower local cost of living or smaller specialized-employer cluster. Approximately 830 grinding, lapping, polishing, and buffing machine tool setters, operators, and tenders, metal and plastics are employed across the Riverside-San Bernardino-Ontario MSA in SOC 51-4033.

The Riverside-San Bernardino-Ontario pay distribution spans from $35,200 at the 10th percentile to $60,000 at the 90th — a 1.7× 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 $37,790 and the 75th at $47,480, so half of Riverside-San Bernardino-Ontario-based grinding, lapping, polishing, and buffing machine tool setters, operators, and tenders, metal and plastics 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 Riverside-San Bernardino-Ontario, CA 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 CA data, and peer-metro comparisons — a median is a starting point, not a ceiling.