Water treatment plants and distribution systems at community and non-transient non-community public water systems are classified based on the size and complexity of the water system facility. Classification of a water system or water system facility determines the level of certification required for operators in direct responsible charge of a water system or water system facility as prescribed by OAR 333-061-0225.
Classification: - Population Served:
Water Distribution 1 - 1 to 1,500.
Water Distribution 2 - 1,501 to 15,000.
Water Distribution 3 - 15,001 to 50,000.
Water Distribution 4 - 50,001 or more
Item - Points.
Treatment system size: (population served or flow whichever is greater)
Population served - 1/10,000 (max 30)
Average daily flow - 1/1 mgd (max 30)
Treatment system water source:
Groundwater: - 3
Surface water or groundwater under the influence of surface water - 5
Chemical treatment/addition process:
Fluoridation - 5.
Disinfection:
Ultraviolet light(UV) - 2.
UV with chlorine residual - 5.
Ammonia/chloramination - 3.
Chlorine - 5.
On-site generated chlorine or mixed oxidants - 7.Ozonation (on-site generation) - 10.
Disinfectant residual maintenance - 0.
pH adjustment:
Slaked-quicklime (calcium oxide) - 5.
Hydrated lime (calcium hydroxide) - 4.
All others - 1.
(hydrochloric acid, sodium hydroxide, sulfuric acid, sodium carbonate).
Coagulation & flocculation processes:
Chemical addition - 1-5.
(1 point for each type of chemical coagulant or polymer added, maximum 5 points).
Rapid mix units:
Mechanical mixers - 3.
Injection mixers - 2.
In-line blender mixers - 2.
Flocculation units:
Hydraulic flocculators - 2.
Mechanical flocculators - 3.
Clarification and sedimentation processes:
Adsorption clarifier - 10.
Horizontal-flow (rectangular basins) - 5.
Horizontal-flow (round basins) - 7.
Up-flow solid contact sedimentation - 15.
Inclined-plate sedimentation - 10.
Tube sedimentation - 10.
Dissolved air flotation - 10.
Filtration processes:
Single/mono media filtration - 3.
Dual or mixed media filtration - 5.
Membrane Filtration/microscreens - 5.
Direct - 5.
Diatomaceous earth - 12.
Slow sand filtration - 5.
Cartridge/bag filters - 5.
Pressure or greensand filtration - 10.
Stability or corrosion control:
Slaked-Quicklime (calcium oxide) - 10.
Hydrated Lime (calcium hydroxide) - 8.
Caustic soda (sodium hydroxide) - 6.
Orthophosphate - 5.
Soda ash (sodium carbonate) - 4.
Aeration: packed tower, diffusers - 3.
Calcite - 2.
Others: sodium bicarbonate, silicates - 4.
Other treatment processes:
Aeration - 3.
Packed tower aeration - 5.
Ion exchange/softening - 5.
Lime-soda ash softening - 20.
Copper sulfate treatment - 5.
Powdered activated carbon - 5.
Potassium permanganate - 5.
Special processes (reverse osmosis, activated alumina, other) - 15.
Sequestering (polyphosphates) - 3.
Residuals disposal:
Discharge to lagoons - 5.
Discharge to lagoons and then raw water source - 8.
Discharge to raw water - 10.
Disposal to sanitary sewer - 3.
Mechanical dewatering - 5.
On-site disposal - 5.
Land application - 5.
Solids composting - 5.
Facility characteristics Instrumentation:
The use of SCADA or similar instrumentation systems to provide data with no process control - 1.
The use of SCADA or similar instrumentation systems to provide data with partial process control - 3.
The use of SCADA or similar instrumentation systems to provide data with complete process control - 5
Clear well size less than average day design flow - 5.
Classification of water treatment plants.
Classification - Points:
Water Treatment 1 - 1 to 30.
Water Treatment 2 - 31 to 55.
Water Treatment 3 - 56 to 75.
Water Treatment 4 - 76 or more.
Or. Admin. Code § 333-061-0220
Statutory/Other Authority: ORS 448.131
Statutes/Other Implemented: ORS 448.450 & 448.455