Originally Posted by dad_of_jon
This is a great bit of info many thanks for it. So Welsh Water (WW) it would appear are giving an area based 'general' figure or pre treatment figure. It's as you say what is coming out of your tap that's important.
if WW are measuring what comes out of the borehole that's not going to be the same after they've treated it, is it?
Well I would assume that thier published measurements are post-treatment, for quality control and audit purposes.
It wouldn't make sense to publish what the water is prior to treatment.
Saying that however the water is losing a lot of hardness between their output and my tap.... But then I'm don't know enough about it yet to say whether or not that is possible.
I guess the take-home message is that you can't count on your local water authority figures.