Wastewater Math Practice Problems
California’s Grade I and II wastewater exams each include 10 math problems worth 4 points, and you must earn at least half of those points to pass. WPI puts 10 to 12 percent of its Class I and II wastewater treatment exams in calculations.
45 true/false, 25 multiple choice and 10 math problems on the 150-minute clock, scored on points like the real exam, with an explanation for every option.
Or try the free wastewater math drill- 35 original wastewater math questions, every option explained
- Tested on 9 of our 25 practice exams
A circular clarifier is 50 ft in diameter and receives 1.0 MGD. About what is the surface overflow rate?
What our wastewater math questions cover
- Pounds formula, volume, area and detention time
- Surface overflow, weir overflow, hydraulic and organic loading
- F/M, SVI, MCRT and wasting rates
- Percent removal, BOD and TSS calculations
- Chlorine dose and demand, sludge and lift station pumping, sewer slope
This list is our own summary, written for practice. The exam owners publish their outlines: California’s Expected Range of Knowledge, TCEQ’s Need-to-Know Criteria and WPI’s Need-to-Know Criteria.
Drill wastewater math, then sit a full practice exam
45 true/false, 25 multiple choice and 10 math problems on the 150-minute clock, scored on points like the real exam, with an explanation for every option.
Or try the free wastewater math drillIdeas the questions test most
- lb/day = mg/L × MGD × 8.34.
- SVI = mL/L × 1,000 ÷ MLSS.
- MCRT = solids in system ÷ solids leaving per day.
- Pumping rate with inflow = inflow + drawdown rate.
Start the free wastewater math drill · California Wastewater Grade I practice test · California Wastewater Grade II practice test · TCEQ Class D Wastewater practice test · TCEQ Class C Wastewater practice test · TCEQ Collection Class I practice test · Wastewater Treatment Class I practice test
Common questions
How is math scored on the California wastewater exam?
Grades I and II have ten math problems at 4 points each. You need 70 percent of all points and at least 20 of the 40 math points.
Which formulas matter most?
The pounds formula, detention time, overflow rates, F/M, SVI, MCRT and percent removal appear across the California, Texas and WPI outlines.
45 true/false, 25 multiple choice and 10 math problems on the 150-minute clock, scored on points like the real exam, with an explanation for every option.
Or try the free wastewater math drillMore operator topics
Outlines used for these questions: Expected Range of Knowledge, Drinking Water Treatment Exam (rev. 4/2020, PDF) · Expected Range of Knowledge, Drinking Water Distribution Exam (rev. 4/2020, PDF) · TCEQ: Need-to-Know Criteria for public water system operators · TCEQ: What applicants for wastewater licenses need to know · WPI: 2025 Need-to-Know Criteria.
Game Assessment Prep is an independent practice site, not affiliated with or endorsed by Water Professionals International (WPI, formerly ABC), the California State Water Resources Control Board or the Texas Commission on Environmental Quality. Every question is original; none is taken from a certification exam, an official study guide or another prep provider.