Or. Admin. R. 333-061-0220

Current through Register Vol. 63, No. 6, June 1, 2024

Section 333-061-0220 - Classification of Water Treatment Plants and Water Distribution Systems

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.

(1) Small water system classification applies when a water system serves fewer than151 service connections and:

(a) Uses only groundwater as its source; or

(b) Purchases finished water from another public water system.

(2) Water distribution classification applies when a water system is not classified as small in accordance with section (1) of this rule, and is based on the population served by the water system as follows:

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

(3) Water treatment classification applies to water treatment plants when:

(a) A water system is not classified as small in accordance with section (1) of this rule; and

(b) Treatment is provided for contaminants identified in OAR 333-061-0030(1) through (5) and (7) by that water treatment plant.

(c) Water treatment classification is based on a point system that reflects the complexity of water treatment present. Points are assigned as follows:

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.

(4) Filtration endorsement is an additional classification that applies when a water treatment plant is classified as Water Treatment 2 and uses conventional or direct filtration treatment to treat surface water or groundwater under the influence of surface water. Filtration endorsement certification, as prescribed by OAR 333-061-0235, is required for operators designated in direct responsible charge of a water treatment plant receiving the filtration endorsement classification, except for those operators already certified at Water Treatment Level 3 or higher.

Or. Admin. R. 333-061-0220

HD 2-1988(Temp), f. & cert. ef. 2-10-88; HD 18-1988, f. & cert. ef. 7-27-88; HD 11-1989(Temp), f. & cert. ef. 12-29-89; Reverted to HD 18-1988, f. & cert. ef. 7-27-88; HD 19-1990, f. 6-28-90, cert. ef. 7-2-90; HD 14-1997, f. & cert. ef. 10-31-97; OHD 7-2002, f. & cert. ef. 5-2-02; PH 16-2004(Temp), f. & cert. ef. 4-9-04 thru 10-5-04; PH 20-2004, f. & cert. ef. 6-18-04; PH 33-2004, f. & cert. ef. 10-21-04; PH 2-2006, f. & cert. ef. 1-31-06; PH 4-2009, f. & cert. ef. 5-18-09; PH 3-2013, f. & cert. ef. 1-25-13; PH 14-2014, f. & cert. ef. 5-8-14; PH 7-2023, amend filed 01/31/2023, effective 2/1/2023

Statutory/Other Authority: ORS 448.131

Statutes/Other Implemented: ORS 448.450 & 448.455