Inflow, Infiltration and Overflow Questions

Collection System Monitoring, Evaluation and Adjustment is 14 to 16 questions on WPI’s Collection Class I and II exams. Practice keeping clear water and sewage where they belong.

Take the Wastewater Collection Class I practice exam

100 questions in the official content counts, with a score for every area and an explanation for every option.

Or try the free i/i and overflows drill
  • 15 original i/i and overflows questions, every option explained
  • Tested on 5 of our 25 practice exams
Free sample · Question 1 of 3I/I and overflows

Why is reducing inflow and infiltration valuable for a utility?

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What our i/i and overflows questions cover

  • Inflow versus infiltration and how each shows in flow data
  • Flow monitoring and capacity problems
  • Overflow causes, first response and public protection
  • Grease interceptors and public education
  • Odors, corrosion monitoring and industrial discharges
Line drawing of rain on a house with a downspout tied into a sewer cleanout, groundwater seeping into a cracked sewer pipe and a manhole cover in a street puddle

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 i/i and overflows, then sit a full practice exam

Take the Wastewater Collection Class I practice exam

100 questions in the official content counts, with a score for every area and an explanation for every option.

Or try the free i/i and overflows drill

Ideas the questions test most

  1. Inflow peaks fast after rain; infiltration rises slowly.
  2. Stop the overflow and keep people away first.
  3. Grease and wipes cause many blockages.
  4. Report every overflow as the permit requires.

Start the free i/i and overflows drill · Wastewater Collection Class I practice test · TCEQ Class D Wastewater practice test · TCEQ Class C Wastewater practice test · TCEQ Collection Class I practice test · Wastewater Collection Class II practice test

Common questions

What is the difference between inflow and infiltration?

Infiltration is groundwater entering through pipe and manhole defects; inflow is surface water entering through direct connections such as roof drains and broken cleanouts.

What causes sanitary sewer overflows?

Blockages, pipe and pump station failures, and wet-weather flow beyond the system’s capacity.

Take the Wastewater Collection Class I practice exam

100 questions in the official content counts, with a score for every area and an explanation for every option.

Or try the free i/i and overflows drill

More 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.