Practice by category
Work on one topic at a time. Every category quiz is built from the same questions as the Class and Grade 1-4 practice tests, so what you practice here is what you'll see there.
Jump to: Drinking Water · Distribution · Wastewater · Collections
Drinking Water
Water treatment categories, drawn from the national Class/Grade 1-4 tests.
Water Treatment Processes
Coagulation, sedimentation, filtration, membranes, chemical feed and corrosion control, drawn from the Class 1-4 water treatment tests.
TopicSampling, Lab & Water Quality
Sampling, lab procedures, water chemistry and water quality, drawn from the Class 1-4 water treatment tests.
TopicWater Operator Math
Every water treatment math question on the site in one bank. Conversions, areas and volumes, the pounds formula, detention time and CT, loading rates, pumps and percent removal.
TopicWater Treatment Maintenance & Pumps
Equipment maintenance, pumps and motors, drawn from the Class 1-4 water treatment tests.
TopicSource Water & Wells
Surface water, groundwater, well construction and well operation, drawn from the Class 1-4 water treatment tests.
TopicDrinking Water Regulations & Records
Safe Drinking Water Act rules, monitoring requirements, recordkeeping and reporting, drawn from the Class 1-4 water treatment tests.
TopicDistribution & Storage
Distribution systems, storage, hydraulics and cross-connection control, drawn from the Class 1-4 water treatment tests.
TopicDisinfection
Chlorine, chloramines, CT and disinfection byproducts, drawn from the Class 1-4 water treatment tests.
TopicWater Treatment Safety
Chemical handling, confined spaces, electrical and plant safety, drawn from the Class 1-4 water treatment tests.
Distribution
Water distribution categories, drawn from the national Class/Grade 1-4 tests.
Distribution System Components
Pipe, valves, hydrants, meters and storage, drawn from the Grade 1-4 water distribution tests.
TopicWater Distribution Safety
Trenching, traffic control, confined spaces and work-zone safety, drawn from the Grade 1-4 water distribution tests.
TopicDistribution Equipment & Maintenance
Equipment, tools and system maintenance, drawn from the Grade 1-4 water distribution tests.
TopicDistribution Water Quality & Sampling
Water quality in the distribution system, sampling and cross-connection control, drawn from the Grade 1-4 water distribution tests.
TopicWater Distribution Math
Every water distribution math question on the site in one bank: pressure and head, flow and velocity, volumes, disinfection of mains and pumps.
Wastewater
Wastewater treatment categories, drawn from the national Class/Grade 1-4 tests.
Activated Sludge & BNR
Activated sludge process control, F/M, sludge age, settleability, nitrification and nutrient removal, drawn from the Class 1-4 wastewater tests.
TopicWastewater Operator Math
Every wastewater treatment math question on the site in one bank: the pounds formula, F/M and MCRT, detention time, loading rates, SVI and percent removal.
TopicWastewater Lab & Sampling
Lab tests, sampling and wastewater characteristics, drawn from the Class 1-4 wastewater tests.
TopicWastewater Maintenance & Pumps
Equipment maintenance, pumps and motors, drawn from the Class 1-4 wastewater tests.
TopicSolids & Digestion
Thickening, digestion, dewatering and biosolids, drawn from the Class 1-4 wastewater tests.
TopicPreliminary Treatment & Clarification
Screening, grit removal, primary and secondary clarification, drawn from the Class 1-4 wastewater tests.
TopicWastewater Regulations & Collection
NPDES permits, reporting and the collection system, drawn from the Class 1-4 wastewater tests.
TopicWastewater Disinfection
Chlorination, dechlorination and UV, drawn from the Class 1-4 wastewater tests.
TopicWastewater Treatment Safety
Confined spaces, gases, chemical handling and plant safety, drawn from the Class 1-4 wastewater tests.
TopicFixed Film & Lagoons
Trickling filters, RBCs and lagoons, drawn from the Class 1-4 wastewater tests.
Collections
Wastewater collection categories, drawn from the national Class/Grade 1-4 tests.
Collections Equipment & Maintenance
Equipment, cleaning and sewer maintenance, drawn from the Grade 1-4 wastewater collection tests.
TopicCollection System
Sewer design, gravity lines, manholes and I&I, drawn from the Grade 1-4 wastewater collection tests.
TopicCollections Monitoring & Inspection
Flow monitoring, inspection and CCTV, drawn from the Grade 1-4 wastewater collection tests.
TopicLift Stations & Pumps
Lift stations, wet wells and pumps, drawn from the Grade 1-4 wastewater collection tests.
TopicCollections Safety
Confined spaces, H2S and traffic safety, drawn from the Grade 1-4 wastewater collection tests.
TopicWastewater Collections Math
Every wastewater collections math question on the site in one bank: flow, velocity, volume, pumping and lift-station math.