OAR 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 (General Requirements Applying to Water Suppliers and Water Systems).

(1)

Small water system classification applies when a water system serves 150 service connections or less 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 (Maximum Contaminant Levels and Action Levels)(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 (UV) — 2.
UV with Chlorine Residual — 5.
Ammonia/Chloramination — 3.
Chlorine — 5.
Mixed Oxidants — 7.
Ozonation (on-site generation) — 10.
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 (Operator Certification Requirements, Levels 1–4), 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.

Source: Rule 333-061-0220 — Classification of Water Treatment Plants and Water Distribution Systems, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=333-061-0220.

333‑061‑0005
Purpose 333‑061‑0010
Scope 333‑061‑0015
Adoption by Reference 333‑061‑0020
Definitions 333‑061‑0025
Responsibilities of Water Suppliers 333‑061‑0030
Maximum Contaminant Levels and Action Levels 333‑061‑0031
Maximum Residual Disinfectant Levels 333‑061‑0032
Treatment Requirements and Performance Standards for Surface Water, Groundwater Under Direct Influence of Surface Water, and Groundwater 333‑061‑0034
Treatment Requirements and Performance Standards for Corrosion Control 333‑061‑0036
Sampling and Analytical Requirements 333‑061‑0040
Reporting and Record Keeping 333‑061‑0042
Public Notice 333‑061‑0043
Consumer Confidence Reports 333‑061‑0045
Variances 333‑061‑0046
Permits 333‑061‑0050
Construction Standards 333‑061‑0055
Waivers from Construction Standards 333‑061‑0057
Voluntary Drinking Water Protection Program 333‑061‑0060
Plan Submission and Review Requirements 333‑061‑0061
Capacity Requirements for Public Water Systems 333‑061‑0062
Land Use Coordination 333‑061‑0063
Environmental Review Process for The Safe Drinking Water Revolving Loan Fund Program 333‑061‑0064
Emergency Response Plan Requirements 333‑061‑0065
Operation and Maintenance 333‑061‑0070
Cross Connection Control Requirements 333‑061‑0071
Backflow Prevention Assembly Installation and Operation Standards 333‑061‑0072
Backflow Assembly Tester Certification 333‑061‑0073
Cross Connection Specialist Certification 333‑061‑0074
Cross Connection Training Programs, Course, and Instructor Requirements 333‑061‑0075
Sanitary Surveys of Watersheds 333‑061‑0076
Sanitary Surveys 333‑061‑0077
Composite Correction Program & Comprehensive Performance Evaluations 333‑061‑0078
Coliform Investigations 333‑061‑0080
Role of Counties 333‑061‑0085
Supplemental Fluoridation 333‑061‑0087
Product Acceptability Criteria 333‑061‑0089
Annual Water System Fee 333‑061‑0090
Penalties 333‑061‑0095
Severability 333‑061‑0097
Adverse Health Effects Language 333‑061‑0098
References 333‑061‑0210
Operator Certification: Scope 333‑061‑0220
Classification of Water Treatment Plants and Water Distribution Systems 333‑061‑0225
General Requirements Applying to Water Suppliers and Water Systems 333‑061‑0228
Certification Requirements for Small Water System Operators 333‑061‑0230
Contracting For Services 333‑061‑0232
General Requirements Applying to Water System Operators 333‑061‑0235
Operator Certification Requirements, Levels 1–4 333‑061‑0245
Applications for Certification Levels 1–4 333‑061‑0250
Examinations for Certification, Levels 1–4 333‑061‑0260
Certificate Renewal Levels 1–4 333‑061‑0265
Fees 333‑061‑0270
Refusal, Suspension, or Revocation of Certification 333‑061‑0272
Suspension of Certification 333‑061‑0305
Domestic Well Program: Purpose 333‑061‑0310
Scope 333‑061‑0324
Area of Public Health Concern 333‑061‑0325
Domestic Well Tests 333‑061‑0330
Accredited Laboratories 333‑061‑0335
Sample Collection 333‑061‑0400
Reducing Lead in School Drinking Water 333‑061‑0510
Applicability of Cyanotoxin Rules 333‑061‑0520
Definitions 333‑061‑0530
Health Advisory Levels 333‑061‑0540
Cyanotoxin Monitoring 333‑061‑0550
Analytical Methods 333‑061‑0560
Reporting 333‑061‑0570
Public Notification 333‑061‑0580
Record Keeping
Last Updated

Jun. 8, 2021

Rule 333-061-0220’s source at or​.us