• Wastewater Treatment Plant Operator Grades I-II
  This book covers Grades I and II of the State Water Resources Control Board operator certification test.
• Wastewater Treatment Plant Operator Grades III
  This book covers Grade III of the State Water Resources Control Board operator certification test.
• Wastewater Treatment Plant Operator Grades IV-V
  This book covers Grades IV and V of the State Water Resources Control Board operator certification test.

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