Trade Exam · Module 2
Water Conservation and CalGreen
California-specific water conservation rules — low-flow fixture limits (CalGreen and CPC), rainwater and graywater basics, recycled water labeling, and the conservation items the C-36 planning section will test.
Key Takeaways
Why This Matters on the Exam
Water conservation is one of the CSLB-listed sub-bullets under Planning and Estimating (22% of the trade exam) — and it's the most California-specific thing you'll see. The exam wants to know that you understand low-flow fixture limits, where you're allowed to use non-potable water, and what you have to do when retrofitting older systems. Out-of-state study guides skip most of this. Don't.
What You Must Know
California enforces fixture flow limits through two stacked sources: the California Plumbing Code (CPC) and CalGreen (the California Green Building Standards Code, Title 24 Part 11). The flow numbers below come from the current CalGreen mandatory low-rise residential and non-residential schedules — they're the ones the exam writes questions around. You also need to know the basic rules for graywater, rainwater, and recycled water, plus the CSC retrofit-on-sale law (CC §1101.4) that triggers fixture replacement when a property changes hands.
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