Free Wastewater Collection Class I Exam Prep
ABC/WPI Wastewater Collection System Operator Class I Certification Exam
Prepare for the Wastewater Collection Class I exam without spending hundreds on expensive prep courses. Free study guides, practice questions, flashcards, and related exam resources.
Quick Facts
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Wastewater ABC Water Operator Certification License: Complete Roadmap
Follow this path to organize your licensing and exam preparation
Collection System Components and MaterialsYou are here
Learn gravity sewer vs force main, pipe materials (PVC, VCP, RCP, DI, HDPE), pipe sizes from 4" laterals to 24"+ trunks, manhole anatomy, and minimum slopes/velocities for self-cleaning flow.
Lift Stations and Force Mains
Master wet well vs dry well design, submersible pump operation, level controls, pump alternation, force main air relief and check valves, emergency power, and basic SCADA alarms.
Inspection, Cleaning, and I/I
Cover hydraulic jetting, rodding, vacuum trucks, CCTV inspection and NASSCO PACP/MACP/LACP coding, smoke testing, root and grease control, inflow vs infiltration, and SSO/CSO reporting.
Safety, Math, and Regulations
Practice confined space entry limits (O2, LEL, H2S, CO), H2S sources and control, excavation safety, MUTCD traffic control, basic Manning's flow math, and NPDES/Clean Water Act framework. Finish with timed full-length practice attempts.
Can You Take the Wastewater Collection Class I Exam?
Check if you meet the basic eligibility requirements
- •WPI/ABC standardized exams are used by 40+ state certifying authorities for wastewater collection operator certification
- •Class I covers the smallest collection systems (commonly limited by population served, miles of sewer, or lift station count)
- •Passing the exam alone does not grant certification — states require application approval, experience verification, and sometimes training hours
- •Some states require continuing education for license renewal
- •Reciprocity may be available through WPI's interstate recognition program
Wastewater Collection Class I Quick Facts
Time to Get Licensed
3–6 weeks typical for Class I candidates
From start to license in hand
Exam Provider
Varies by state certification authority — most administer WPI standardized exams at proctored centers
Retake Policy
Varies by jurisdiction. Many state certifying authorities impose waiting periods after exam failure and may require additional training or experience before retesting.
Total Cost Breakdown
Free Wastewater Collection Class I Prep Tools
100 Practice Questions
Covers gravity sewers, lift stations, force mains, CCTV inspection, sewer cleaning, I/I, SSOs, FOG, and confined-space safety at the Class I level.
Updated 2026
Aligned to current WPI Need-to-Know Criteria, EPA NPDES SSO reporting rules, OSHA confined space standards, and NASSCO PACP/MACP/LACP coding.
Detailed Explanations
Every question includes a full explanation that teaches the underlying process, calculation, or safety rule — not just the right answer.
100% Free
All 100 questions are free with no account or signup required.
What You'll Study
9 chapters covering the exam topics in this guide
Chapter 1: Gravity Sewers, System Components & Materials
4 sections
Chapter 2: Lift Stations, Pumping Systems & Force Mains
5 sections
Chapter 3: Sewer Inspection, Testing & Cleaning
5 sections
Chapter 4: Inflow & Infiltration (I/I), SSOs & FOG Management
5 sections
Chapter 5: Safety, Confined Space Entry & Environmental Hazards
5 sections
Chapter 6: Operator Math, Hydraulics & System Administration
5 sections
Chapter 7: Equipment Operation, Tools & Preventive Maintenance
5 sections
Chapter 8: System Restoration, Mapping & Emergency Operations
5 sections
Chapter 9: Monitoring, Safety Programs & System Administration
5 sections
Wastewater Collection Class I Exam Details
ABC/WPI Wastewater Collection System Operator Class I Certification Exam
Administered by Water Professionals International (WPI, formerly Association of Boards of Certification — ABC)
Exam Content Breakdown
Based on the official Water Professionals International (WPI, formerly Association of Boards of Certification — ABC) content outline
Gravity sewers, force mains, manholes, laterals, cleanouts, pipe materials (PVC SDR 35, VCP, RCP, ductile iron, HDPE), pipe sizes, and slope/velocity fundamentals.
Wet well vs dry well, submersible pumps, level controls (floats, bubblers, ultrasonic, pressure transducers), pump alternation, force main air relief and check valves, emergency power, SCADA.
Hydraulic jetting, mechanical rodding, vacuum/combination trucks, CCTV inspection, NASSCO PACP/MACP/LACP coding, smoke testing for cross-connections, root and grease control.
Inflow vs infiltration sources, RDII, SSO vs CSO, NPDES reporting, FOG (fats/oils/grease) interceptors, public notification, overflow response and root cause analysis.
OSHA 1910.146 confined space entry (O2 19.5–23.5%, LEL <10%, H2S <10 ppm), H2S hazard and control (ferric chloride, calcium nitrate, hypochlorite), excavation safety (OSHA 1926 Subpart P), traffic control, MUTCD, 811 Call Before You Dig.
Manning's equation basics, flow conversions, velocity, force main TDH, NPDES framework, Clean Water Act, easements, and routine reporting requirements.
What's Included
9 Chapters
Complete exam coverage
Practice Quizzes
With detailed explanations
Free to Start
No credit card required
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Wastewater Collection Class I Exam FAQ
Official Water Professionals International (WPI, formerly Association of Boards of Certification — ABC) Resources
Verify information with these official sources
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