Collection System Maintenance Questions

Collection System Operation, Maintenance and Restoration is 27 questions on WPI’s Collection Class I exam, and Texas’s Class I collection criteria cover facilities, construction and operation.

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.

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  • 34 original collection maintenance questions, every option explained
  • Tested on 5 of our 25 practice exams
Free sample · Question 1 of 3Collection maintenance

A customer reports sewage backing up into a floor drain. What should the crew check first?

Choose the best answer

What our collection maintenance questions cover

  • Gravity sewers, slopes, manholes, benches and cleanouts
  • Stoppages, roots and grease
  • Hydrogen sulfide corrosion and odor control
  • Pipe materials, grade, testing and separation from water mains
  • Rehabilitation: CIPP, pipe bursting, manhole sealing; CMOM
Line drawing of a sewer cutaway between two manholes: a cracked pipe with tree roots growing in at a joint and a relined section with a smooth liner

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 collection maintenance, 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 collection maintenance drill

Ideas the questions test most

  1. Gravity sewers are designed for at least 2 ft/s.
  2. H2S becomes sulfuric acid above the water line.
  3. Texas: gravity pipes at least 6 inches.
  4. Lining needs a host pipe that still holds its shape.

Start the free collection maintenance 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

Why do sewers corrode?

Bacteria turn hydrogen sulfide gas into sulfuric acid on moist surfaces above the water line, which attacks concrete and metal.

What does Texas require for gravity sewer slope?

Under 30 TAC §217.53, collection systems must have slopes that give a velocity of at least 2.0 feet per second.

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 collection maintenance 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.