That's a vital job. It's also interesting to observe how different communities regulate their water supplies. In Massachusetts, for example, I was often surprised at some wonderful reservoirs that totally prohibited any kind of human activity, even access on the shore or canoeing.
In Virginia, I'm glad some reservoirs allow reasonable human access, but also surprised many allow gasoline motors to be used on them. No matter what the size of the reservoir or efficiency of the treatment plant, just doesn't seem like a good idea to allow petroleum products near them.
What do you water managers think about access to reservoirs and gas motors on them?