California Wastewater Grade 4 Exam Prep
Inside this course
- 500 original practice questions across 13 content areas, organized around the subject structure of the board’s Grade 4 examination information sheet.
- A fixed set of 12 free sample questions, so you can gauge the style before you buy.
- A full 100-question practice exam (180 minutes) drawing fresh questions on every attempt.
- Calculation items throughout — 117 across the bank — all solvable from the board’s Equivalents and Formula sheet.
- The passing standard on the real Grade IV exam is the State Water Board’s own published standard: at least 70% overall — 90 of 128 points — and at least 50% on the mathematics questions. Our full practice exam is scored at that same 70% overall mark, so your practice score is measured against the board’s bar.
A drill for each of the 13 topics:
- Safety and Hazards
- Preliminary and Primary Treatment
- Secondary Treatment Processes
- Activated Sludge Process Control and Modifications
- Tertiary Treatment
- Anaerobic Digestion and Solids Handling
- Disinfection
- Wastewater Stabilization Ponds
- Sampling and Laboratory Analysis
- Plant Performance Evaluation
- Supervision, Management, and Training
- Water Reclamation and Reuse
- Regulations, Plant Classification, and Certification