Plumbing & Water System Compliance Guide
The violation category with the highest public health consequence.
A cross connection does not announce itself. Plumbing violations get written up because the failure mode is contamination of potable water, and that risk sits behind a wall until somebody tests for it.
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Handwashing sink temperature: get this one right
The FDA Food Code requires a handwashing sink to deliver water of at least 100°F through a mixing valve or combination faucet.
You will see 120°F quoted for hand sinks. That number belongs to water heater setpoints and warewashing, not to the sink someone puts their hands under. Water at 120°F can scald, and delivering it at a hand sink is a hazard rather than a compliance win. Check your adopted code, and check what your mixing valve is actually set to.
What inspectors write up
- Missing or untested backflow prevention on hose bibbs, chemical dispensers, and equipment connections
- Cross connections between potable supply and non-potable systems
- Missing air gap on warewashing and food prep drains. The gap must be at least twice the diameter of the supply inlet and never less than 1 inch
- Handwashing sinks blocked, used for other purposes, or lacking soap and towels
- Grease interceptors not maintained or without service records
- Floor sinks and drains clogged or backing up
Who enforces this
Two model codes compete depending on region: the Uniform Plumbing Code, published by IAPMO, and the International Plumbing Code, published by the ICC. Your jurisdiction adopted one of them, in a specific edition, possibly amended. Neither publisher inspects anyone.
Backflow testing is usually enforced separately by your water purveyor rather than the building department, on their own schedule, by testers they certify. That is a second inspection regime people forget exists until a notice arrives.
Free compliance checklist
Download the Plumbing Compliance Checklist (PDF)
Where signage fits
Non-potable water identification, handwashing-only sink marking, and backflow device labeling all prevent the specific failures that get written up. A hand sink used for rinsing mops is a violation created by nobody knowing it was a hand sink.
Browse 8x12 aluminum safety signs or see all building and health code guides.