Sewage or wastewater not disposed of properly — backups can contaminate the whole kitchen.
Plumbing not installed or maintained properly — leaks, mop sink issues, unserviced water filters, or missing backflow prevention.
High-risk food (like meat) thawed improperly, promoting bacterial growth.
Food-contact or nonfood-contact surfaces improperly designed, constructed, maintained, or located.
Floors, walls, ceilings, or attached equipment dirty, damaged, or poorly vented.