| Size (Peak day design capacity, gallons per day) - 100,001 - 500,000 | 9 |
| Pretreatment - Influent pumping | 2 |
| Pretreatment - Flow equalization basin | 1 |
| Pretreatment - Mechanically cleaned screens | 2 |
| Secondary Treatment - Activated sludge: Diffused or dispersed aeration | 10 |
| Secondary Treatment - Activated sludge: Additional points if an activated sludge plant is operated in high rate mode or contact stabilization mode | 2 |
| Secondary Treatment - Secondary clarifiers | 4 |
| Advanced Waste Treatment - Nitrification by extended aeration only | 2 |
| Advanced Waste Treatment - pH adjustment | 3 |
| Sludge Thickening and Dewatering - Sludge decant tank | 2 |
| Sludge Stabilization and Conditioning - Aerobic digestion | 5 |
| Solids Disposal - Off-site disposal | 1 |
| Disinfection - Liquid and powdered hypochlorites | 3 |
| Disinfection - Dechlorination with dechlorination agents other than gas | 3 |