Water and Wastewater Operations
Certification Overview UPDATED
ACTUAL Questions and CORRECT
Answers
Basic requirements of a water and wastewater certification program - CORRECT
ANSWER✔✔- Education, experience, mandatory training and examination.
Typical goals of water and wastewater system owners and operators - CORRECT
ANSWER✔✔- Assurance of high drinking water quality.
Level I Certification requirements - CORRECT ANSWER✔✔- Grade 12 education or GED,
1 year of experience, and 0 years of DRC (Direct Responsible Charge).
Number of questions in Level I Certification exam - CORRECT ANSWER✔✔- 100
Minimum requirements to pass the certification exam - CORRECT ANSWER✔✔-
Minimum 70% correct on the entire exam.
Bacteria inhabiting the intestinal tract - CORRECT ANSWER✔✔- Coliform bacteria.
Most important factor in determining water safety - CORRECT ANSWER✔✔- Absence of
coliform organisms.
Definition of a toxic substance - CORRECT ANSWER✔✔- One which is poisonous and can
be harmful or fatal if taken internally.
Type of sewer that receives many tributary branches - CORRECT ANSWER✔✔- Trunk
sewer.
Biological treatment of wastewater - CORRECT ANSWER✔✔- Secondary treatment.
,Elements responsible for water hardness - CORRECT ANSWER✔✔- Mg & Ca.
Particles in water that can be removed by filtration - CORRECT ANSWER✔✔- Suspended
solids.
Type of weir used to measure small flows - CORRECT ANSWER✔✔- V-Notch.
Common filter media - CORRECT ANSWER✔✔- Diatomaceous Earth.
Chemical not used for pH adjustment - CORRECT ANSWER✔✔- Sodium metaphosphate.
Maximum population served by a Class I Water Distribution system - CORRECT
ANSWER✔✔- 1,500.
Factors determining distribution system samples for bacteriological testing - CORRECT
ANSWER✔✔- Population and per capita consumption.
Publication describing limits for drinking water quality in Canada - CORRECT
ANSWER✔✔- Guidelines for Canadian Drinking Water Quality - Latest Edition.
Authority regulating water supply systems - CORRECT ANSWER✔✔- Provincial
Environment Department.
Classification of water treatment plants - CORRECT ANSWER✔✔- Derived from the
plant's process complexity.
Typical hazard categories in municipal operations - CORRECT ANSWER✔✔- Confined
spaces.
Common hazards in confined spaces - CORRECT ANSWER✔✔- Oxygen deficiency.
, Range of explosive gases for gas detectors - CORRECT ANSWER✔✔- From 0 to 100% to
the LEL.
Best way to avoid electrical shock - CORRECT ANSWER✔✔- Avoid standing on water or
metal while working on a live circuit.
Immediate death cause from high concentrations of chlorine gas - CORRECT ANSWER✔✔-
Asphyxiation.
Main reason for high accident rate in water industry - CORRECT ANSWER✔✔- Worker
carelessness, ignorance, or indifference.
Percentage of accidents from improper handling and lifting techniques - CORRECT
ANSWER✔✔- 22%.
Main reason electrical work should be done by qualified personnel - CORRECT
ANSWER✔✔- To follow electrical regulations.
Safety precaution when entering confined spaces - CORRECT ANSWER✔✔- Check for
oxygen deficiency.
Most likely reasons why trenches may cave in - CORRECT ANSWER✔✔- Lack of shoring
and soil instability.
Concentration of gas for explosion to occur - CORRECT ANSWER✔✔- Above the LEL or
below the UEL.
Type of fires a Carbon Dioxide (Class C) extinguisher can be used on - CORRECT
ANSWER✔✔- Class C only.
Explosive gas - CORRECT ANSWER✔✔- A gas that can cause an explosion, examples
include Hydrogen Sulfide, Methane, and Phosgene.
Certification Overview UPDATED
ACTUAL Questions and CORRECT
Answers
Basic requirements of a water and wastewater certification program - CORRECT
ANSWER✔✔- Education, experience, mandatory training and examination.
Typical goals of water and wastewater system owners and operators - CORRECT
ANSWER✔✔- Assurance of high drinking water quality.
Level I Certification requirements - CORRECT ANSWER✔✔- Grade 12 education or GED,
1 year of experience, and 0 years of DRC (Direct Responsible Charge).
Number of questions in Level I Certification exam - CORRECT ANSWER✔✔- 100
Minimum requirements to pass the certification exam - CORRECT ANSWER✔✔-
Minimum 70% correct on the entire exam.
Bacteria inhabiting the intestinal tract - CORRECT ANSWER✔✔- Coliform bacteria.
Most important factor in determining water safety - CORRECT ANSWER✔✔- Absence of
coliform organisms.
Definition of a toxic substance - CORRECT ANSWER✔✔- One which is poisonous and can
be harmful or fatal if taken internally.
Type of sewer that receives many tributary branches - CORRECT ANSWER✔✔- Trunk
sewer.
Biological treatment of wastewater - CORRECT ANSWER✔✔- Secondary treatment.
,Elements responsible for water hardness - CORRECT ANSWER✔✔- Mg & Ca.
Particles in water that can be removed by filtration - CORRECT ANSWER✔✔- Suspended
solids.
Type of weir used to measure small flows - CORRECT ANSWER✔✔- V-Notch.
Common filter media - CORRECT ANSWER✔✔- Diatomaceous Earth.
Chemical not used for pH adjustment - CORRECT ANSWER✔✔- Sodium metaphosphate.
Maximum population served by a Class I Water Distribution system - CORRECT
ANSWER✔✔- 1,500.
Factors determining distribution system samples for bacteriological testing - CORRECT
ANSWER✔✔- Population and per capita consumption.
Publication describing limits for drinking water quality in Canada - CORRECT
ANSWER✔✔- Guidelines for Canadian Drinking Water Quality - Latest Edition.
Authority regulating water supply systems - CORRECT ANSWER✔✔- Provincial
Environment Department.
Classification of water treatment plants - CORRECT ANSWER✔✔- Derived from the
plant's process complexity.
Typical hazard categories in municipal operations - CORRECT ANSWER✔✔- Confined
spaces.
Common hazards in confined spaces - CORRECT ANSWER✔✔- Oxygen deficiency.
, Range of explosive gases for gas detectors - CORRECT ANSWER✔✔- From 0 to 100% to
the LEL.
Best way to avoid electrical shock - CORRECT ANSWER✔✔- Avoid standing on water or
metal while working on a live circuit.
Immediate death cause from high concentrations of chlorine gas - CORRECT ANSWER✔✔-
Asphyxiation.
Main reason for high accident rate in water industry - CORRECT ANSWER✔✔- Worker
carelessness, ignorance, or indifference.
Percentage of accidents from improper handling and lifting techniques - CORRECT
ANSWER✔✔- 22%.
Main reason electrical work should be done by qualified personnel - CORRECT
ANSWER✔✔- To follow electrical regulations.
Safety precaution when entering confined spaces - CORRECT ANSWER✔✔- Check for
oxygen deficiency.
Most likely reasons why trenches may cave in - CORRECT ANSWER✔✔- Lack of shoring
and soil instability.
Concentration of gas for explosion to occur - CORRECT ANSWER✔✔- Above the LEL or
below the UEL.
Type of fires a Carbon Dioxide (Class C) extinguisher can be used on - CORRECT
ANSWER✔✔- Class C only.
Explosive gas - CORRECT ANSWER✔✔- A gas that can cause an explosion, examples
include Hydrogen Sulfide, Methane, and Phosgene.
