| Size (Peak day design capacity, gallons per day) - less than 10,000 | 1 |
| Water Supply Source - Groundwater | 2 |
| Pretreatment - Roughing filter: Non-backwashable strainer or filter | 2 |
| Adjustment and Corrosion Control - Corrosion inhibitor | 3 |
| Aeration / Ion Exchange - Aeration: Mechanical or diffused | 3 |
| Activated Carbon - Granular activated carbon contactors | 4 |
| Oxidation - Potassium permanganate | 4 |
| Coagulation - Primary coagulant | 5 |
| Flocculation - Hydraulic flocculator | 4 |
| Sedimentation - Tube settlers | 2 |
| Filtration - Membrane filtration | 8 |
| Disinfection - Liquid and powdered hypochlorites | 3 |
| Sludge Treatment - Discharge to sewer or other off-site treatment | 0 |
| Storage - Tank capacity less than 50,000 gallons | 1 |
| Storage - Pressure tanks | 0 |