Waterworks Operator Certification Exam Resources

Standardized Water Treatment Operator Need-to-Know

• WPI Standardized Water Treatment Operator Class I
• WPI Standardized Water Treatment Operator Class II
• WPI Standardized Water Treatment Operator Class III
• WPI Standardized Water Treatment Operator Class IV

Standardized Water Distribution Operator Need-to-Know

• WPI Standardized Water Distribution Operator Class I
• WPI Standardized Water Distribution Operator Class II
• WPI Standardized Water Distribution Operator Class III
• WPI Standardized Water Distribution Operator Class IV

WPI Formula Conversion Table 5-29-2025