Drainage, Waste & VentQuestion 154 of 360
Sub-soil drains, foundation drains, and other clear-water drainage collected below sewer level should discharge to…
a.the sanitary sewer directly
b.a separate sump that pumps clear water to an approved point of disposal, kept separate from sewage
c.a grease interceptor
d.the vent stack
Explanation
Clear-water drainage such as foundation and sub-soil drains must be collected in its own sump and pumped to an approved disposal point, not mixed with sanitary sewage. This avoids overloading the sanitary system with ground water and keeps a clean-water pump from handling sewage. The clear-water sump does not need to be gastight like a sewage sump.
Law Reference: 2022 California Plumbing Code (CPC) §710.0Practice all 360 questions free — no signup required.
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