Cheat sheet
Water Treatment Operator Cheat Sheet
Treatment Process
- 33% of exam
- Treatment Train Coagulation Filtration Disinfection Process Picker
Laboratory Analysis
- 16% of exam
- Routine Tests Jar Testing Sampling Lab QA Data Picker
Equipment Operation
- 23% of exam
- Pumps Valves Meters SCADA Equipment Picker
Source Water
- 15% of exam
- Surface Water Groundwater Watershed Seasonal Changes Source Picker
Safety + Administration
- 13% of exam
- Chemical Safety SOPs Public Notice Records Safety Picker
Quick Facts
- Exam body WPI / states
- Questions 100 scored
- Pretest Up to 10
- Time 3 hours
- Pass Often 70%
- Calculations 12%
- Cognitive 70% application
- Formula sheet Provided
Treatment Train Order PR
- Coagulate, grow, settle, filter, disinfect.
- Coagulation Flocculation Sedimentation Filtration Disinfection
Coagulation vs Flocculation PR
Coagulation
- Rapid mix
- Neutralizes charge
- Chemical dose
Flocculation
- Slow mix
- Builds floc
- Contact time
- Dose first, grow second
Process Picker PR
- Fine particles → Coagulation ( Neutralize charge )
- Weak floc → Flocculation ( Gentle mixing )
- Heavy floc → Sedimentation ( Settle solids )
- Turbid effluent → Filtration ( Polish water )
- Pathogen risk → Disinfection ( Meet CT )
- Low residual → Increase dose ( Check demand )
Treatment Train PR
- Screening Remove large debris
- Coagulation Destabilize particles
- Flocculation Build settleable floc
- Sedimentation Gravity settling
- Filtration Polish turbidity
- Disinfection Inactivate pathogens
- Clearwell Storage plus contact
- Residual Distribution protection
Chlorine Balance PR
- Dose minus demand leaves residual.
- Dose Demand Residual CT
Dose vs Residual PR
Dose
- Chemical applied
- Before demand
- Operator controlled
Residual
- Chemical remaining
- After demand
- Compliance measured
- Demand consumes dose
Coagulation Control PR
- Alum Common coagulant
- Ferric salts Iron coagulants
- Polymer Coagulant aid
- pH Controls charge
- Alkalinity Buffers pH
- Rapid mix Chemical dispersion
- Zeta potential Particle charge
- Streaming current Charge monitor
Free vs Combined Chlorine PR
Free
- Stronger disinfectant
- Shorter persistence
- Breakpoint target
Combined
- Weaker disinfectant
- Longer persistence
- Chloramine residual
- Free kills faster
Filtration PR
- Rapid sand Conventional filter
- Slow sand Biological layer
- Anthracite Coarse top media
- Headloss Clogging indicator
- Breakthrough Turbidity spike
- Backwash Clean filter bed
- Ripening Postwash stabilization
- Filter aid Improves capture
Disinfection PR
- CT Concentration times time
- T10 Effective contact time
- Demand Dose minus residual
- Free chlorine Strong primary
- Chloramine Longer residual
- Ozone Strong oxidant
- UV No residual
- DBPs Disinfection byproducts
Operator Math PR
- lbs/day Dose x flow x 8.34
- Dose lbs/day / flow / 8.34
- Demand Dose minus residual
- Detention Volume divided flow
- Pressure Feet divided 2.31
- Volume Area times depth
- Percent Part divided whole
- MGD Million gallons daily
Lab Quality Checks LA
- Calibrate, blank, duplicate, document.
- Calibration Blank Duplicate Chain custody
Recall vs Application LA
Recall
- Definitions
- Recognition
- 30% exam
Application
- Calculations
- Troubleshooting
- 70% exam
- Practice decisions most
Data Picker LA
- Coagulant dose → Jar test
- Filter health → Turbidity trend
- Disinfection proof → Residual + time
- Corrosion control → pH/alkalinity
- Instrument drift → Calibration standard
- Questionable result → Duplicate sample
Routine Tests LA
- Turbidity Particle cloudiness
- pH Acid/base condition
- Alkalinity Buffer capacity
- Hardness Calcium/magnesium
- Color Organic signal
- Temperature Reaction speed
- Residual Disinfectant remaining
- Bacteria Microbial indicator
Jar Testing LA
- Purpose Find best dose
- Rapid mix Simulate coagulation
- Slow mix Simulate flocculation
- Settling Compare clarity
- pH series Find optimum
- Turbidity check Measure performance
- Sludge volume Settling clue
- Plant trial Confirm cautiously
Sampling + QA LA
- Grab sample Instant condition
- Composite Time blended
- Chain custody Sample tracking
- Preservation Protect integrity
- Calibration Instrument accuracy
- Blank Contamination check
- Duplicate Precision check
- Standard Known value
Equipment Picker EQ
- No flow → Check pump ( Prime first )
- High amps → Check load ( Motor stress )
- Vibration → Check bearings ( Alignment clue )
- Erratic analyzer → Clean/calibrate ( Verify grab )
- Remote alarm → SCADA trend ( Confirm field )
- Wrong chemical feed → Stroke setting ( Verify drawdown )
Pumps + Motors EQ
- Centrifugal Flow by velocity
- Positive displacement Fixed volume
- Cavitation Vapor bubble damage
- Priming Remove air
- Seal Leak control
- Bearing Supports rotation
- Amps Motor load
- VFD Speed control
Controls + Instruments EQ
- SCADA Remote monitoring
- PLC Local controller
- Flow meter Measure flow
- Analyzer Online chemistry
- Telemetry Signal transmission
- Alarm Abnormal condition
- Setpoint Control target
- Trending Pattern review
Surface vs Groundwater SO
Surface
- Turbidity swings
- Pathogen exposure
- Watershed driven
Groundwater
- Stable quality
- Minerals common
- Wellhead driven
- Source controls treatment
Source Water SO
- Surface water Rapidly variable
- Groundwater Mineral rich
- GUI Surface influence
- Watershed Drainage area
- Algae Taste/odor risk
- Runoff Turbidity spike
- Wellhead Groundwater protection
- Reservoir turnover Seasonal mixing
Safety Order SA
- Read SDS before handling chemicals.
- SDS PPE Ventilation Spill plan
MCL vs MCLG SA
MCL
- Enforceable standard
- Feasibility considered
- Compliance limit
MCLG
- Health goal
- Not enforceable
- Safety margin
- MCL is enforceable
Safety Picker SA
- Chemical unloading → SDS + PPE
- Tank entry → Confined permit
- Repair energized gear → LOTO
- Water violation → Public notice
- Cyber alert → Incident plan
- Process upset → Emergency SOP
Safety + Compliance SA
- SDS Chemical hazards
- PPE Worker protection
- LOTO Energy isolation
- Confined space Permit entry
- SOP Standard procedure
- Public notice Violation communication
- CCR Annual water report
- MCL Enforceable limit
Common Traps
Dose Is Not Residual
- Chemical added ≠ Chemical remaining
Turbidity Is Not Color
- Suspended particles ≠ Dissolved appearance
Detention Is Not CT
- Hydraulic time ≠ Disinfection exposure
Calibration Is Not Cleaning
- Adjusts accuracy ≠ Removes fouling
MCL Is Not MCLG
- Legal limit ≠ Health target
SOP Is Not SDS
- Work procedure ≠ Chemical hazard
Last Minute
- 1. Treatment Process = 33%
- 2. Equipment O&M = 23%
- 3. Lab Analysis = 16%
- 4. Source Water = 15%
- 5. Safety/Admin = 13%
- 6. Dose - demand = residual
- 7. CT = concentration x time
- 8. 8.34 converts mg/L-MGD
- 9. MCL enforceable; MCLG goal
- 10. Jar tests guide dosing
- 11. Surface water changes quickly
- 12. Use SDS before chemicals
Water Treatment Operator
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