Steel as you say is considered a easily cleanable surface. As for your water, you are to have a hot water heater on site, hand wash sink, and triple wash vats. You can run the cold water through a line from a tested source annually, and only in a food grade hose or pipe. This is Wisconsin rules, not sure about MN.
Mark
Where we made syrup long before the trendies made it popular, now its just another commodity.
John Deere 4000, 830, and 420 crawler
1400 taps, 600 gph CDL RO, 4x12 wood-fired Leader, forced air and preheater. 400 gallon Sap-O-Matic vacuum gathering tank, PTO powered. 2500 gallon X truck tank, 17 bulk tanks.
No cage tanks allowed on this farm!