Very wet today. Lots of water running down the road so I had to feel sorry for the man from the Water Board who came to my door asking for 2 glasses - one with some tap water, the other empty!! This happens regularly and I've stopped being surprised.
There's a covered reservoir across the road, full of treated drinking water for the City, water that has fallen in the Brecon Beacons many miles away. Because everyone is told to alert the Water Board when they spot a leak, someone who isn't a local, will spot water bubbling out of the roadside and report it to the Water Board, The Water man comes out to inspect the leak, take a sample of the bubbling water and test it against a sample of tap water - and they always seem to come to me for this!
To the best of my knowledge, after years of these tests, its not drinking water, but run off from the uphill springs and the roadway that finds a way into the conduits that carry the BT lines under the road. When the water reaches the same point (just before a BT manhole cover) the water is forced up and out into the road. It can be quite spectacular some days, not quite Old Faithful geyser, but interesting, nonetheless.
The very wet Water man took his bubbling water sample and tested it against the tap water, told me in words I didn't understand how the water quality differed, and gave me back my glasses, duly rinsed in hand sanitiser!!
You must excuse me when I get over-excited at seeing someone. Its quite a rarity these days.