NYC Environmental Engineer Exam With
Actual Questions & Verified Answers, Plus
Explained Rationales/Expert Verified For
Guaranteed 100% Pass 2026/Latest
Update/Instant Download Pdf
1. Which of the following is the primary purpose of the Clean Water
Act (CWA)?
A. Regulate air pollutants
B. Control hazardous waste
C. Maintain and restore the chemical, physical, and biological
integrity of the nation’s waters
D. Manage solid waste disposal
C. Maintain and restore the chemical, physical, and biological integrity
of the nation’s waters
The Clean Water Act focuses on protecting the quality of surface
waters, including rivers, lakes, and streams, by regulating discharges
and establishing water quality standards.
2. The main function of a wastewater treatment primary clarifier is
to:
A. Remove dissolved nutrients
B. Settle out suspended solids
C. Disinfect effluent
D. Remove pathogens
,B. Settle out suspended solids
Primary clarifiers allow heavy solids to settle by gravity, reducing the
load on secondary treatment processes.
3. Which of the following is a non-point source of pollution?
A. Industrial discharge pipe
B. Municipal sewage treatment plant outfall
C. Runoff from agricultural fields
D. Oil refinery effluent
C. Runoff from agricultural fields
Non-point source pollution comes from diffuse sources like rainfall
runoff carrying fertilizers, pesticides, and sediments.
4. In an activated sludge process, the purpose of aeration is to:
A. Remove solids by sedimentation
B. Provide oxygen for microbial degradation of organic matter
C. Disinfect water
D. Remove nutrients chemically
B. Provide oxygen for microbial degradation of organic matter
Aeration supplies dissolved oxygen to aerobic bacteria, which
metabolize organic pollutants in wastewater.
5. The National Environmental Policy Act (NEPA) primarily requires:
A. Permits for air emissions
B. Environmental impact assessments for federal projects
C. Hazardous waste cleanup
D. Water quality monitoring
B. Environmental impact assessments for federal projects
NEPA mandates federal agencies to evaluate the environmental
consequences of proposed actions before decisions are made.
, 6. The term “biochemical oxygen demand (BOD)” refers to:
A. The amount of oxygen required to chemically oxidize organic
matter
B. The amount of oxygen used by microorganisms to decompose
organic matter
C. The concentration of dissolved oxygen in water
D. The rate of oxygen production by algae
B. The amount of oxygen used by microorganisms to decompose
organic matter
BOD measures the oxygen demand of microbial populations to break
down organic pollutants in water over a specified time.
7. Which of the following pollutants is most associated with
eutrophication?
A. Mercury
B. Nitrogen and phosphorus
C. Lead
D. Volatile organic compounds (VOCs)
B. Nitrogen and phosphorus
Excess nutrients like nitrogen and phosphorus stimulate algal blooms,
which deplete oxygen and disrupt aquatic ecosystems.
8. Which soil type generally has the highest permeability?
A. Clay
B. Silt
C. Sand
D. Peat
C. Sand
Sandy soils have larger particles and pore spaces, allowing water to
, move through them more quickly than fine-grained soils like clay or
silt.
9. Which federal agency is responsible for regulating safe drinking
water in the U.S.?
A. U.S. Fish and Wildlife Service
B. Environmental Protection Agency (EPA)
C. Occupational Safety and Health Administration (OSHA)
D. Department of Energy
B. Environmental Protection Agency (EPA)
EPA establishes drinking water standards under the Safe Drinking
Water Act to protect public health.
10. A septic system primarily treats wastewater through:
A. Chemical precipitation
B. Physical filtration
C. Biological decomposition and soil percolation
D. Membrane separation
C. Biological decomposition and soil percolation
Septic systems rely on anaerobic bacteria to break down organic
matter, with remaining effluent filtered through soil layers.
11. Which of the following is considered a greenhouse gas?
A. Oxygen
B. Methane
C. Argon
D. Helium
B. Methane
Methane traps heat in the atmosphere, contributing to global
warming alongside CO₂ and nitrous oxide.
Actual Questions & Verified Answers, Plus
Explained Rationales/Expert Verified For
Guaranteed 100% Pass 2026/Latest
Update/Instant Download Pdf
1. Which of the following is the primary purpose of the Clean Water
Act (CWA)?
A. Regulate air pollutants
B. Control hazardous waste
C. Maintain and restore the chemical, physical, and biological
integrity of the nation’s waters
D. Manage solid waste disposal
C. Maintain and restore the chemical, physical, and biological integrity
of the nation’s waters
The Clean Water Act focuses on protecting the quality of surface
waters, including rivers, lakes, and streams, by regulating discharges
and establishing water quality standards.
2. The main function of a wastewater treatment primary clarifier is
to:
A. Remove dissolved nutrients
B. Settle out suspended solids
C. Disinfect effluent
D. Remove pathogens
,B. Settle out suspended solids
Primary clarifiers allow heavy solids to settle by gravity, reducing the
load on secondary treatment processes.
3. Which of the following is a non-point source of pollution?
A. Industrial discharge pipe
B. Municipal sewage treatment plant outfall
C. Runoff from agricultural fields
D. Oil refinery effluent
C. Runoff from agricultural fields
Non-point source pollution comes from diffuse sources like rainfall
runoff carrying fertilizers, pesticides, and sediments.
4. In an activated sludge process, the purpose of aeration is to:
A. Remove solids by sedimentation
B. Provide oxygen for microbial degradation of organic matter
C. Disinfect water
D. Remove nutrients chemically
B. Provide oxygen for microbial degradation of organic matter
Aeration supplies dissolved oxygen to aerobic bacteria, which
metabolize organic pollutants in wastewater.
5. The National Environmental Policy Act (NEPA) primarily requires:
A. Permits for air emissions
B. Environmental impact assessments for federal projects
C. Hazardous waste cleanup
D. Water quality monitoring
B. Environmental impact assessments for federal projects
NEPA mandates federal agencies to evaluate the environmental
consequences of proposed actions before decisions are made.
, 6. The term “biochemical oxygen demand (BOD)” refers to:
A. The amount of oxygen required to chemically oxidize organic
matter
B. The amount of oxygen used by microorganisms to decompose
organic matter
C. The concentration of dissolved oxygen in water
D. The rate of oxygen production by algae
B. The amount of oxygen used by microorganisms to decompose
organic matter
BOD measures the oxygen demand of microbial populations to break
down organic pollutants in water over a specified time.
7. Which of the following pollutants is most associated with
eutrophication?
A. Mercury
B. Nitrogen and phosphorus
C. Lead
D. Volatile organic compounds (VOCs)
B. Nitrogen and phosphorus
Excess nutrients like nitrogen and phosphorus stimulate algal blooms,
which deplete oxygen and disrupt aquatic ecosystems.
8. Which soil type generally has the highest permeability?
A. Clay
B. Silt
C. Sand
D. Peat
C. Sand
Sandy soils have larger particles and pore spaces, allowing water to
, move through them more quickly than fine-grained soils like clay or
silt.
9. Which federal agency is responsible for regulating safe drinking
water in the U.S.?
A. U.S. Fish and Wildlife Service
B. Environmental Protection Agency (EPA)
C. Occupational Safety and Health Administration (OSHA)
D. Department of Energy
B. Environmental Protection Agency (EPA)
EPA establishes drinking water standards under the Safe Drinking
Water Act to protect public health.
10. A septic system primarily treats wastewater through:
A. Chemical precipitation
B. Physical filtration
C. Biological decomposition and soil percolation
D. Membrane separation
C. Biological decomposition and soil percolation
Septic systems rely on anaerobic bacteria to break down organic
matter, with remaining effluent filtered through soil layers.
11. Which of the following is considered a greenhouse gas?
A. Oxygen
B. Methane
C. Argon
D. Helium
B. Methane
Methane traps heat in the atmosphere, contributing to global
warming alongside CO₂ and nitrous oxide.
