Observations on the Setting:
In increasing numbers, food in North America is being grown in greenhouse production houses, with sophisticated, automated management, and in an almost unending number of growth cycles. Natural and artificial lights give off UV light and water lines run everywhere.
The problem is that the same light that encourages photosynthesis in plants also warms the cyclically stagnant water in the feedlines to the temperature that is perfect for the growth of e.coli, salmonella and legionella.