Employment data are from the U.S. Department of Labor's Bureau of Labor Statistics, Occupational Employment and Wage Statistics and Employment Projections programs. State-level projections data are from Projections Central and State Labor Market Information offices.

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          Current Employment for Water and Wastewater Treatment Plant and System Operators in CALIFORNIA

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          Rank Region 2025 Employment
          1 Los Angeles-Long Beach-Anaheim, CA Metro Area 2,230
          2 Riverside-San Bernardino-Ontario, CA Metro Area 1,580
          3 San Francisco-Oakland-Fremont, CA Metro Area 1,040
          4 Sacramento-Roseville-Folsom, CA Metro Area 1,010
          5 San Diego-Chula Vista-Carlsbad, CA Metro Area 880
          6 Bakersfield-Delano, CA Metro Area 460
          7 San Jose-Sunnyvale-Santa Clara, CA Metro Area 460
          8 Fresno, CA Metro Area 400
          9 Oxnard-Thousand Oaks-Ventura, CA Metro Area 320
          10 Stockton-Lodi, CA Metro Area 280
          11 North Coast Region of California Balance of State 260
          12 Santa Maria-Santa Barbara, CA Metro Area 250
          13 Modesto, CA Metro Area 210
          14 North Valley-Northern Mountains Region of California Balance of State 210
          15 Eastern Sierra-Mother Lode Region of California Balance of State 200
          16 San Luis Obispo-Paso Robles, CA Metro Area 200
          17 Vallejo, CA Metro Area 200
          18 Salinas, CA Metro Area 190
          19 Santa Rosa-Petaluma, CA Metro Area 190
          20 Visalia, CA Metro Area 190
          21 Merced, CA Metro Area 110
          22 Chico, CA Metro Area 100
          23 El Centro, CA Metro Area 100
          24 Napa, CA Metro Area 100
          25 Yuba City, CA Metro Area 100
          26 Redding, CA Metro Area 90
          27 Santa Cruz-Watsonville, CA Metro Area 80
          28 Hanford-Corcoran, CA Metro Area 60