# South Dakota Plumbing Code Update (2024) Licensed plumbers and building contractors must follow updated plumbing installation standards that clarify several common practices. Key changes include: floor drains in mechanical rooms must slope one-quarter inch per foot in a one-foot radius around the drain (not just slope toward the drain); CPVC Schedule 80 or 40 pipe can now be used instead of cast iron for underground high-temperature discharge; and horizontal wet venting rules are modified to allow longer vent runs in certain configurations. The update also adjusts requirements for water service piping depth, backflow prevention testing, water heater drip pans, dishwasher discharge connections, and vent terminal sizing, effective October 28, 2025.
AI-generated from the adopted rule text — verify against the official documents.
Modify amendments to the 2024 plumbing code adoption including clarifying floor drain sloping, acceptable use of CPVC 80 pipe and fittings, and guidance for horizontal wet venting.
No specific cites listed — see the package documents.
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