HI Water/WW Operator study guide
HI Water/WW Operator · Work through your exam, one topic at a time.
The Hawaii Water Treatment Plant and Wastewater Treatment Plant Operator Certification is administered within the Hawaii State Department of Health (HDOH) framework, with drinking water operator certification handled under the Safe Drinking Water Branch and wastewater operator certification under the Wastewater Branch. This study page is for candidates preparing for either pathway - water treatment and distribution, or wastewater treatment and collection - and for operators already in the field who need a structured review. The exam content spans four practice domains: Water Treatment, Water Distribution, Wastewater Treatment, and Wastewater Collection. Expect questions on treatment process control and math, distribution system hydraulics and disinfection residual maintenance, biological wastewater treatment and solids handling, and collection system flow, infiltration, and maintenance. The HI Water/WW Operator study guide has 4 sections and about 1,562 words.
01Water Treatment: Process Control, Rules, and Math
Water Treatment on the Hawaii operator exam tests process control, regulatory compliance, and applied math for groundwater, surface water, and groundwater under the direct influence of surface water (GWUDI). The Hawaii Department of Health Safe Drinking Water Branch administers drinking water rules, and the Board of Certification issues operator credentials by plant classification.
406 words, about 2 min02Water Distribution: Pressure, Storage, and Public Health Protection
Water Distribution tests operation and maintenance of mains, storage, pumps, valves, hydrants, meters, and cross-connection control in island systems. Hawaii's systems range from large municipal grids to small county and private systems.
391 words, about 2 min03Wastewater Treatment: Process Control and Permit Compliance
Wastewater Treatment tests process control, permit compliance, solids handling, disinfection, and safety. Hawaii facilities often discharge through ocean outfalls or injection wells and produce reclaimed water for irrigation.
372 words, about 2 min04Wastewater Collection: Gravity Sewers, Lift Stations, and Overflow Prevention
Wastewater Collection tests gravity sewers, force mains, lift stations, manholes, inspection and cleaning, and overflow prevention. Hawaii's high groundwater, corrosive gases, tropical storms, and coastal discharges make infiltration/inflow, hydrogen sulfide corrosion, and emergency response recurring themes.
393 words, about 2 min