Water Mains, Valves and Hydrants Questions

Water Mains and Piping is 20 questions on the California D1 and D2 exams, and valves and hydrants fall under Equipment, another 20. Practice the pipe work of distribution.

Take the California D2 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 mains and valves drill
  • 53 original mains and valves questions, every option explained
  • Tested on 10 of our 25 practice exams
Free sample · Question 1 of 3Mains and valves

Why do many utilities require a permit and a backflow device for contractors who draw water from hydrants?

Choose the best answer

What our mains and valves questions cover

  • Ductile iron, PVC and HDPE pipe, bedding, thrust blocks and joints
  • Services: corporation stops, curb stops, meters and wet taps
  • Main breaks, repair clamps, disinfection after repair and boil-water advisories
  • Unidirectional flushing, dead ends and storage tank inspection
  • Gate and butterfly valves, exercising, air valves, PRVs, hydrants and flow tests
Line drawing of an open shored trench with a water main on bedding, a thrust block at a bend, a gate valve, and a fire hydrant at the curb above

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 mains and valves, then sit a full practice exam

Take the California D2 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 mains and valves drill

Ideas the questions test most

  1. Close large valves slowly to avoid water hammer.
  2. Air release valves at high points, blowoffs at low points.
  3. Open dry-barrel hydrants fully so the drain does not wash out the base.
  4. Call 811 before digging.

Start the free mains and valves drill · California D2 practice test · California D1 practice test · California D3 practice test · California D4 practice test · TCEQ Class D Water practice test · TCEQ Class C Distribution practice test

Common questions

What is on the California D exams?

Six categories: Disinfection, Distribution System Design/Hydraulics, Equipment Operation/Maintenance/Inspections, Regulations/Management/Safety, Water Mains and Piping, and Water Quality/Water Source, with counts that change by grade.

Why exercise valves?

So they work when needed. Turning them on a schedule finds broken, buried or seized valves before an emergency.

Take the California D2 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 mains and valves 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.