IPC · 2024 International Plumbing Code
§608 · Cross-connection / backflow
Effective in IPC 2024.
Plain-English explainer
608 is the cross-connection / backflow control rule: potable supply lines are protected at the service entrance and at fixtures where a contamination hazard exists, with hose bibbs, irrigation lines, boiler make-up lines, and similar connections all carrying an approved backflow device. The drafter cites it for any permit that adds a hose bib, an irrigation branch, or a boiler feed.
Why inspectors flag this
A hose bibb, an irrigation branch, or a boiler make-up line without the listed backflow device is the canonical 608 red-tag; the drafter lifts the rule so the spec lists the right assembly before the rough-in.
As quoted in the code: Potable supply lines are protected against cross-connection and backflow with approved assemblies at the service entrance and at fixtures where a contamination hazard exists; hose bibbs, irrigation lines, boiler make-up lines, and similar connections all carry an approved backflow device.
See all codes that cite this trade
Browse the full International Plumbing Code index for one place to read every section the drafter is allowed to quote. See all codes →
See pricing
See every code, every jurisdiction — without the binder.
Trussmark turns job-site photos and voice notes into code-cited permit drafts the inspector can verify on the spot. Pick the plan that fits your shop and we will size the rest with you. Already cited this code in IPC 2024? Drop your email and we'll size the rest of the permit draft for you. See pricing →
See pricing