chuckbear wrote:
Can anyone provide any verifiable sources for anyone that has gotten seriously ill that is definitely contributed to the water system in their RV? Chuck
Reading a study that a substantial number of RV water systems are contaminated with Legionella does not appear to be enough of a warning for you.  Do you have an opening where you can feel the sides of your water tank?  I can almost guarantee it will feel slimy if you have not sanitized the tank within a few months.  You might even be able to see some pink or other discoloration due to bacteria.  You can also have the water cultured.  I dealt with ultrapure lab water and it was still hard to keep the water from becoming contaminated at each spigot.
I don't know how much warning you need.  I am not about to do a literature search to satisfy your skepticism.  Instead I will just keep treating my system before each season and if the water is stagnant or unchlorinated.