We will taste the water after hooking up at the campground and if the water tastes good then we drink it. If it does taste funky then we turn the water off at the spigot and fill a container or two from the fresh water tank for drinking water and coffee. Then turn the spigot back on for flushing and washing.
Water with dangerous bacteria levels in it does not taste any different than safe water.
I full time so I am at different CQ's more than the average RV'er. AND my house had well water. So I am familiar with the pro's and con's of well water!
CG's are NOT required to test their well water on a certain schedule as many campers seem to think. In general property with a well only gets tested when the property is sold. Unless a home owner chooses to have it tested for their own purpose. I tested my well water often and on several occasions had to disinfect it. And with housing your well has to be X amount of feet away from the septic field.
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That said, CG property's have an average of 100 plus or minus campsites all with 'open' sewer hook ups running in conjunction with and very close proximity to water lines. The well is situated on the same property.
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THAT scenario alone is why I do NOT ever drink water from CG hookups or when used to be filled into my holding tank.
Holding tanks are just large petrie dishes. A minute amount of a bacteria, that your stomach normally could handle in the water when you put it in, will bloom in a holding tank to not safe levels.
Add hundreds of open sewer connections, sewer dumping spills, the well on the same property and.....well...do the math of the % of incidence of contaminated water! :B