| Wastewater Treatment Topics – Class 1 | | |
| Wastewater Treatment Review (21 hours) | | |
| Wastewater Treatment Review (12 hours) | | |
| Wastewater Treatment Review (4 hours) | 120 days | |
| WWERG4 | Wastewater Treatment Exam Preparation – Grade 4 | 120 Days Online Access | |
| WWERG1 | Wastewater Treatment Exam Preparation – Grade 1 | 120 Days Online Access | |
| WWERG2 | Wastewater Treatment Exam Preparation – Grade 2 | 120 Days Online Access | |
| WWERG3 | Wastewater Treatment Exam Preparation – Grade 3 | 120 Days Online Access | |