We have soak aways and a £40 rebate on the water bill. The water here in Suffolk costs 2 x what it was in Bucks. That despite the fact all they do is use an aquifer to get the water, so no real infrastructure like reservoirs to maintain.
I would add that when we bought the house we had to tell the water company we had soak aways . The house is on a Taylor Wimpey estate was secondhand but 1 year old when we bought it. The previous resident had the rebate but somehow it didn't transfer.
The lesson is clear check your bill.
