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Exam Review

Key Facts: PE Water Resources Exam

80

Exam Questions

NCEES

9 hrs

Appointment Time

NCEES

71%

First-Time Pass Rate

NCEES July 2026

$400

Exam Fee

NCEES

12

Content Areas

NCEES

Apr 2024

Current Spec Effective

NCEES

The PE Civil Water Resources exam uses the NCEES Civil: Water Resources and Environmental discipline blueprint, with 80 questions in a 9-hour appointment. The NCEES civil page lists a 71% first-time pass rate and 49% repeat pass rate for the July 2026 reporting window. The current official WRE specification is effective beginning April 2024 and lists design standards effective April 1, 2024.

Sample PE Water Resources Practice Questions

Try these sample questions to review concepts for the PE Water Resources exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1A 2,400 ft force main is estimated at $68 per linear foot. If fittings and appurtenances add a lump-sum $24,000, what total installed cost should be carried in the quantity takeoff?
A.$163,200
B.$187,200
C.$193,200
D.$211,200
Explanation: Pipe cost is 2,400 x $68 = $163,200. Adding the $24,000 allowance for fittings and appurtenances gives a total of $187,200. Quantity takeoff questions usually separate linear items from lump-sum accessories.
2A project has activities A, B, and C in sequence with durations of 4 days, 7 days, and 5 days. What is the earliest finish of activity C if activity A starts on day 0?
A.11 days
B.12 days
C.16 days
D.17 days
Explanation: The activities are sequential, so the durations add directly. Earliest finish for C is 4 + 7 + 5 = 16 days from project start. Critical-path sequencing questions are often this direct when no parallel paths are shown.
3Two stormwater alternatives have equal service life. Alternative 1 has a present worth cost of $1.25 million, while Alternative 2 has a present worth cost of $1.38 million. Ignoring non-cost factors, which option is economically preferred?
A.Alternative 1 because it has the lower present worth cost
B.Alternative 2 because the higher present worth implies greater long-term value
C.Either option because present worth is only valid for revenues
D.Alternative 2 because lifecycle comparisons require future worth instead
Explanation: For alternatives with equal service and equal analysis period, the option with the lower present worth cost is economically preferred. Present worth already accounts for the time value of money, so no future-worth conversion is needed to make the comparison.
4For a level backfill retaining wall with drainage and no surcharge, which parameter most directly increases active lateral earth pressure on the wall?
A.Lower unit weight of soil
B.Higher internal friction angle
C.Higher backfill unit weight
D.Use of active instead of at-rest conditions
Explanation: Active lateral pressure is proportional to soil unit weight, the earth pressure coefficient, and depth. Increasing unit weight increases the lateral stress at every elevation. Higher friction angle would reduce the active earth pressure coefficient instead of increasing it.
5A compacted fill has a maximum dry density of 122 pcf from the Proctor test. If the specification requires 95% compaction, what minimum dry density must the field test show?
A.110 pcf
B.113 pcf
C.116 pcf
D.119 pcf
Explanation: Required field dry density is 0.95 x 122 = 115.9 pcf. Rounded appropriately, the minimum acceptable value is about 116 pcf. Compaction specifications are typically expressed as a percentage of the laboratory maximum dry density.
6A soil sample has 52% passing the No. 200 sieve and a liquid limit of 38 with a plasticity index of 18. Under USCS, which major group does this soil belong to?
A.Coarse-grained soil
B.Fine-grained soil
C.Highly organic soil
D.Poorly graded sand
Explanation: If more than 50% passes the No. 200 sieve, the soil is classified as fine-grained in USCS. The Atterberg limits would then be used to decide whether it is a clay or silt, but the major group is already determined by the percentage finer than No. 200.
7Which concrete property is most directly indicated by the slump test?
A.Air content
B.Compressive strength
C.Workability and consistency
D.Permeability after curing
Explanation: The slump test is a field indicator of fresh concrete consistency and workability. It does not directly measure strength, although very high or very low slump may signal a mixture that could later cause performance issues. Strength still requires cylinder or other acceptance testing.
8Which pipe material is generally preferred when corrosion resistance is the primary concern for a buried sanitary sewer in aggressive soil, assuming structural loads are modest?
A.Ductile iron without lining
B.Reinforced concrete without coating
C.PVC gravity sewer pipe
D.Bare steel pipe
Explanation: PVC gravity sewer pipe is commonly selected for its corrosion resistance in aggressive soils and wastewater environments. Ductile iron, concrete, and steel can all require additional lining, coating, or corrosion protection depending on service conditions.
9A treatment plant blends 2.0 mgd of source water containing 12 mg/L of nitrate with 1.0 mgd containing 3 mg/L of nitrate. What is the blended concentration?
A.6 mg/L
B.8 mg/L
C.9 mg/L
D.15 mg/L
Explanation: Apply a flow-weighted mass balance: C = (Q1C1 + Q2C2)/(Q1 + Q2). That gives (2.0 x 12 + 1.0 x 3)/3.0 = 27/3 = 9 mg/L. Blend problems on the PE exam are straightforward mass balance calculations.
10A circular secondary clarifier has a diameter of 90 ft and treats 2.5 mgd. What is the surface overflow rate, in gpd/ft^2?
A.196
B.393
C.786
D.1,572
Explanation: Plan area is piD^2/4 = pi(90^2)/4 ≈ 6,362 ft^2. Surface overflow rate is 2,500,000/6,362 ≈ 393 gpd/ft^2. Clarifier loading problems are usually solved with area-based rates, not detention volume alone.

About the PE Water Resources Exam

The NCEES PE Civil Water Resources and Environmental exam is an 80-question computer-based licensure exam for civil engineers practicing in hydrology, hydraulics, water and wastewater systems, groundwater, water quality, and site civil work. The current specification effective beginning April 2024 covers 12 content areas: project planning, soil mechanics, materials, analysis and design, hydraulics in closed conduits, hydraulics in open channels, hydrology, groundwater and wells, surface water and groundwater quality, drinking water distribution and treatment, wastewater collection and treatment, and project sitework.

Exam sponsor: NCEES (Pearson VUE). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

80 questions; multiple-choice and alternative item types

Time Limit

9-hour appointment

Passing Score

NCEES does not publish a fixed passing score

Exam / Certification Fees

$400

Exam sponsor website

Reported exam pass rate: 71%. NCEES July 2026 pass rates show 71% first-time and 49% repeat for Civil: Water Resources and Environmental. This describes exam candidates, not OpenExamPrep users or results from using our resources. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

4-6 questions

Project Planning

Quantity takeoffs, cost estimating, schedules, sequencing, and economic or sustainability comparisons.

3-5 questions

Soil Mechanics

Lateral earth pressure, consolidation, compaction, bearing capacity, settlement, and slope stability.

4-6 questions

Materials

Soil classification and properties, concrete basics, piping materials, and specification conformance.

6-9 questions

Analysis and Design

Mass balance, hydraulic loading, solids loading, and hydraulic flow measurement.

7-11 questions

Hydraulics - Closed Conduit

Bernoulli and continuity applications, headloss, pumps, force mains, wet wells, lift stations, and pipe networks.

7-11 questions

Hydraulics - Open Channel

Open-channel flow, energy dissipation, culverts, gutters, storm sewers, and flow regime analysis.

8-12 questions

Hydrology

IDF relationships, runoff methods, hydrographs, time of concentration, gauging, and stormwater BMP sizing.

4-6 questions

Groundwater and Wells

Aquifers, groundwater flow, and well or drawdown analysis.

5-8 questions

Surface Water and Groundwater Quality

Stream oxygen dynamics, TMDLs, nutrient contamination, and biological or chemical contaminant behavior.

6-9 questions

Drinking Water Distribution and Treatment

Water demands, storage, distribution, conventional treatment, membranes, disinfection, and hardness removal.

7-11 questions

Wastewater Collection and Treatment

Collection systems, primary and secondary treatment, nutrient removal, solids handling, disinfection, and advanced treatment.

9-14 questions

Project Sitework

Earthwork, grading, erosion and sediment control, site layout, retaining walls, roadway-curve basics, and construction methods.

Preparing for the PE Water Resources Exam

What You Need to Know

  • Passing score: NCEES does not publish a fixed passing score
  • Assessment: 80 questions; multiple-choice and alternative item types
  • Time limit: 9-hour appointment
  • Exam / certification fees: $400 Official sources

Using Our Practice Resources

  • Work through all 200 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

PE Water Resources: Suggested Study Strategy

1Work the NCEES PE Civil Reference Handbook until you can find hydraulic, hydrologic, and treatment formulas quickly.
2Do not treat sitework as filler; it carries the widest published question range on the WRE blueprint.
3Practice both USCS and SI units because the exam uses both systems.
4Drill Manning, Bernoulli, Darcy-Weisbach, Hazen-Williams, Rational Method, and NRCS runoff calculations until setup becomes automatic.
5Review drinking-water and wastewater process concepts, not just formulas, because many questions test process selection or operating implications.
6Use timed mixed sets so you switch cleanly between hydrology, hydraulics, treatment, and site civil topics.
7Memorize common demand, storage, detention, loading, and slope relationships conceptually so you catch unreasonable answers fast.
8Practice interpreting profiles, HGL/EGL behavior, and pump-system interactions instead of studying pipes only as isolated equations.
9Spend time on TMDL, dissolved oxygen, and contaminant basics because water-quality questions are often conceptual and easy to underprepare for.
10Solve problems with the same electronic references you will have on exam day rather than relying on outside notes.

Frequently Asked Questions

What is the PE Water Resources exam pass rate?

NCEES lists the July 2026 pass rates for Civil: Water Resources and Environmental as 71% for first-time takers and 49% for repeat takers. These are recent group outcomes, not a published passing-score percentage or a prediction for an individual candidate.

How many questions and how much time are on the exam?

The official NCEES specification says the exam contains 80 questions in a 9-hour appointment. That appointment includes the tutorial and an optional scheduled break, and the exam includes both standard multiple-choice questions and alternative item types.

What topics matter most on the PE Water Resources exam?

The heaviest coverage comes from project sitework, hydrology, closed-conduit hydraulics, open-channel hydraulics, drinking water, and wastewater. You also need working competency in soil mechanics, groundwater, project planning, and water-quality analysis because the current blueprint is integrated and broad.

What references are available during the exam?

NCEES provides the electronic PE Civil Reference Handbook plus the design standards listed on the WRE specification. For the current published specification, the design standards are effective as of April 1, 2024, and include the Ten States Standards for Wastewater Facilities (2014) and Water Works (2018).

Does NCEES publish a passing score?

No. NCEES says exam results are based on the number of correct answers and then converted to a scaled score to account for exam-form difficulty, but it does not publish a fixed passing score or target percentage. Results are reported as pass or fail.

What current materials should I use for PE Water Resources in 2026?

Use the official WRE specification effective beginning April 2024, its listed design standards, the current PE Civil Reference Handbook, and the current NCEES practice exam and errata. NCEES's July 2026 pass-rate table reports 71% for first-time takers and 49% for repeat takers.