FE Environmental centers on water — Fluid Mechanics & Hydraulics and Water & Wastewater are tied for the most-tested topic on the exam, each worth up to 18 questions, with Surface Water Resources & Hydrology close behind. Together with groundwater, air quality, and solid and hazardous waste, water-related topics make up a clear majority of the exam's content.
Ranked by question count weighted against the spec's own difficulty rating — not question count alone, since a smaller topic rated harder can be worth more study time than a bigger, easier one.
1Fluid Mechanics & Hydraulics12–18q
Fluid statics · Closed conduits · Open channel · Pumps
2Water & Wastewater12–18q
Water and wastewater characteristics · Mass balance and loading rates · Physical processes · Chemical processes
3Surface Water Resources & Hydrology9–14q
Runoff calculations · Water storage sizing · Routing · Water quality and modeling
Full Environmental topic breakdown.
Every topic in the official NCEES spec, with its question range and share of the exam. Study Scheduler allocates your study hours in this same proportion automatically.
Mathematics~5% of exam5–8q
Analytic geometry and trigonometry
Algebraic equations and roots
Calculus
Numerical methods
Probability & Statistics~4% of exam4–6q
Measures of central tendencies and dispersions
Probability distributions
Estimation for a single mean
Regression, curve fitting, and goodness of fit
Hypothesis testing
Ethics & Professional Practice~5% of exam5–8q
Codes of ethics
Public health, safety, and welfare
Compliance with codes, standards, and regulations
Engineer's role in society
Engineering Economics~5% of exam5–8q
Time value of money
Cost types and breakdowns
Economic analyses
Project selection
Fundamental Principles~7% of exam7–11q
Population projections and demand calculations
Reactors
Materials science
Environmental Chemistry~7% of exam7–11q
Stoichiometry and chemical reactions
Kinetics
Organic chemistry
Multimedia equilibrium partitioning
Health Hazards & Risk Assessment~4% of exam4–6q
Dose-response toxicity
Exposure routes and pathways
Occupational health
Fluid Mechanics & Hydraulics~12% of exam12–18q
Fluid statics
Closed conduits
Open channel
Pumps
Flow measurement
Blowers
Fluid dynamics
Steady and unsteady flow
Thermodynamics~3% of exam3–5q
Thermodynamic laws
Energy, heat, and work
Behavior of ideal gases
Surface Water Resources & Hydrology~9% of exam9–14q
Runoff calculations
Water storage sizing
Routing
Water quality and modeling
Water budget
Groundwater, Soils & Sediments~8% of exam8–12q
Basic hydrogeology
Groundwater flow
Drawdown
Remediation of soil, sediment, and/or groundwater
Water & Wastewater~12% of exam12–18q
Water and wastewater characteristics
Mass balance and loading rates
Physical processes
Chemical processes
Biological processes
Sludge treatment and handling
Water conservation and reuse
Air Quality & Control~8% of exam8–12q
Ambient and indoor air quality
Mass and energy balances
Emissions
Atmospheric modeling and meteorology
Gas treatment technologies
Particle treatment technologies
Indoor air quality modeling and controls
Solid & Hazardous Waste~7% of exam7–11q
Mass and energy balances
Solid waste management
Solid waste disposal
Hazardous waste compatibility
Site characterization
Hazardous and radioactive waste treatment and disposal
Energy & Environment~4% of exam4–6q
Energy sources concepts
Environmental impact of energy sources and production
Frequently asked about Environmental.
What's the biggest topic on FE Environmental?
Fluid Mechanics & Hydraulics and Water & Wastewater are tied for the most questions, up to 18 each — more than any other topic on the exam.
Does FE Environmental cover air quality and waste, or just water?
Both, but water-related topics (hydraulics, surface water, groundwater, water/wastewater treatment) outweigh air quality and solid/hazardous waste in question count.
For how many hours to budget, week-by-week study plans, and how Study Scheduler weights your plan — see the full FE study guide.
Example plan · FE
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Your schedule combines topic study, review, mock practice, and time away. Actual blocks depend on your exam, study budget, and days off.