PE Environmental follows the NCEES specification effective April 2026: 80 questions across 6 knowledge areas. Water is still the largest by a wide margin at 19–29 questions — roughly a third of the exam — with Air and Site Assessment and Remediation at 13–20 each. The April 2026 specification makes Sustainability its own knowledge area (7–11 questions), covering resource conservation and resilience.
70–108, across 6 topics
Effective April 2026
8 or 8.5 hours testing; 9 or 9.5 hours for the appointment
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.
Water engineering applications · Drinking water · Wastewater · Stormwater and water resources
Engineering applications · Pollution control
Site assessment · Remediation
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.
Between 19 and 29 of the exam’s 80 questions — the largest area by a wide margin, roughly a third of the exam.
Air and Site Assessment and Remediation (13–20 questions each), Solid and Hazardous Waste (11–17), and Sustainability and Environmental and Occupational Health (7–11 each).
For how many hours to budget, week-by-week study plans, and how Study Scheduler weights your plan — see the full PE study guide.
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