Fresh water from a well has no chlorine......take it from me, 3 weeks sitting in the full sun of central Oregon caused the water to smell like a sewer. If the campground provides city water, leave it on the city water. I wouldn't worry about the holding tank for fresh water. If they provide well water, then I'd put chlorine in the water every now and then. As for your question "is the water safe"...... I can imagine, if it's well water, then it's been checked every now and then. If it's city water, then yes, it's safe. The BIG question is --- IS THE WATER GOOD!!! Many areas we've camped the water tasted horrible.