ID Water/WW Operator study plan

Map the Domain 1 blueprint into a written checklist of treatment and distribution subtopics, then rank each subtopic by the exam weight you estimate from the domain's 50% share.

Define and write out the coagulation, flocculation, sedimentation, and filtration sequence in your own words, including what each step removes and what happens downstream if it underperforms.

Calculate at least 10 dosage and loading problems by hand (coagulant feed in mg/L and lb/day, surface overflow rate, filter loading rate in gpm/ft2) and show every unit conversion.

Build a one-page reference sheet of the formulas you used, with units stated for each variable, so later weeks reuse it instead of relearning.

Explain disinfection chemistry for free chlorine, chloramine, and chlorine dioxide, including CT concept, pH dependence, and how each forms or controls disinfection byproducts.

Trace a drop of finished water from the clearwell through storage, mains, service lines, and backflow protection, naming the pressure and residual checkpoints along the way.

Solve CT, chlorine demand, and residual-decay problems and interpret the results against typical regulatory targets you can state from memory.

List the acute and chronic drinking water contaminant groups and match each to its treatment method and monitoring approach.

Diagnose five distribution and treatment failure scenarios (low pressure, coliform hit, nitrification in storage, filter breakthrough, main break) and write the corrective action sequence for each.

Identify the key unit processes and microorganisms in preliminary, primary, and secondary wastewater treatment, and state what each process removes or converts.

Compare the major secondary treatment configurations (activated sludge, trickling filters, lagoons, MBR) on footprint, energy, and effluent quality.

Perform BOD, solids, and loading calculations for a secondary process and check your answers dimensionally.

Explain nitrification and denitrification, including the organisms, oxygen and alkalinity demand, and the operational signals that indicate each is occurring or failing.

Describe sludge handling from thickening through digestion to dewatering, and state what each step does to volume, stability, and disposal options.

Calculate solids retention time, food-to-microorganism ratio, and sludge volume index, and interpret whether each result indicates a healthy or stressed biomass.

Summarize the disinfection and effluent monitoring requirements for wastewater discharge, including indicator organisms and typical permit parameters.

Describe collection system components (gravity mains, lift stations, force mains, manholes) and the flow and slope conditions that keep each functioning.

Explain infiltration and inflow, how each is detected, and the rehabilitation methods used to reduce them.

Identify the safety hazards specific to collections and wastewater, including confined space entry, hydrogen sulfide, methane, and biological exposure, and state the controls for each.

Sequence a sanitary sewer overflow response from discovery through notification, containment, cleanup, and reporting.

Cross-train the shared concepts that appear in both domains: flow measurement, pump curves and hydraulics, disinfection, sampling technique, and chain of custody.

Explain pump operation and common failure modes for both water and wastewater service, including cavitation, air binding, and wear at seals and impellers.

Write out the sampling and monitoring workflow from grab versus composite selection through preservation, holding time, and documentation.

Review regulatory frameworks for both domains and state which parameters are acute versus non-acute and why that distinction drives response time.

Complete a full-length timed practice exam under exam conditions and record your score by domain and subtopic.

Rank your three weakest subtopics and build a targeted review list for each with the specific facts and formulas you need to memorize.

Re-derive every formula on your reference sheet from memory and correct any that you cannot reconstruct cleanly.

Practice explaining a treatment process aloud in under three minutes, as if briefing a new operator, to test recall without notes.

Drill only the weak subtopics identified in week 7 until you can answer representative questions without referring to notes.

Re-take a second timed practice exam and compare domain scores against week 7 to confirm improvement.

Review safety, regulatory, and emergency response facts one final time, since these are commonly missed when candidates over-focus on process math.

Assemble a final one-page pre-exam sheet limited to formulas, unit conversions, and the regulatory thresholds you keep missing.