[PaulDavisThe1st]

I'm the board of my local (rather small) water system. Most of our capital investment is done by spending what we raise from our members/customers, and we try hard not to require loans unless absolutely necessary.

A larger water system has bigger capital projects, but also a larger customer base (and they also likely charge more per liter of water than we do). So it is absolutely not a given that capital investment in water infrastructure requires bonds or loans (though I acknowledge that these likely cannot be avoided).

[rayiner]

Issuing bonds is how virtually every large water system pays for capital projects. My county is very financially responsible (triple AAA bond rating), but it has hundreds of millions in debt outstanding for water/sewer: https://www.fitchratings.com/research/us-public-finance/fitc.... This is a small county with just half a million people.

Again, how much money did these UK water companies invest? What's the number? Without knowing that, you're in no position to say it's in the range of what a government utility would be able to pay out of operating surplus, without issuing bonds.