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Plumber's Licensing Exam: Gray-Water Recycling
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Plumber's Licensing Exam: Gray-Water Recycling
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20 Questions

1. The overflow pipe for a gray-water reservoir must connect to the sanitary drainage system
2. A reservoir for a fixture-flushing gray-water system is designed to retain gray water for a maximum of ______ hours.
3. The minimum reservoir size for a fixture-flushing gray-water system is _____ gallons.
4. What is the maximum reservoir size allowed for a fixture-flushing gray-water system for a family of four?
5. Recycled water for a water closet and urinal flushing system must be
6. If the inflow pipe for a gray-water reservoir is 3 in. in diameter, the overflow pipe must be at least ________ in diameter.
7. Gray water is drained from
8. Filtering is required on the outlet side of the reservoir before the gray water is pumped to the distribution system.
9. The drain at the bottom of a gray-water reservoir must connect to the sanitary drainage system
10. The gray-water reservoir must be
11. Gray water must be disinfected
12. A recycled gray-water subsurface landscape irrigation system reservoir is sized to retain gray water for
13. The main drain from all of the gray-water fixtures must have a valve installed in it.
14. Recycled water for a subsurface irrigation system must be
15. Gray water may be disinfected with
16. For sizing, it is estimated that each person discharges _____ gallons of gray water per day.
17. Makeup water for a subsurface gray-water recycling system
18. Drainage pipes from fixtures that deliver gray water to the gray-water recycling system
19. The color code for nonpotable water is
20. Makeup water is added to a water closet and urinal flushing gray-water recycling system

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