Same for swimming pool or lawn maintenance. The person renting would be the first to demand a refund if the swimming pool has a strange color/odor or if the garbage is overflowing. The property manager can do a daily video check and ask for pool maintenance person to do a check if the water doesn't look good.
Finally, many vacation homes have their own dedicated water systems. Its perfectly possible that the water source can only cater to 6 adult, or that the septic system can dispose for only a max number of people. If the renter comes with a big group, then there will be no water, or the septic system will overflow and clog. Again, in those cases, the group renting will be the first to complain and ask for refunds. So it is important to check via a camera the number of guests coming and making sure it is below the max number of people that the property can accomodate.