Вот здесь на странице 24 найдёшь. Surface water drainage charges form part of sewerage charges and remain payable unless the customer can demonstrate to our satisfaction that there is no direct or indirect surface water drainage to a public sewer from the premises or from any common area next to that premises. Where the customer can demonstrate this to our satisfaction, the surface water drainage charge will cease to be payable from:
premises.https://www.stwater.co.uk/content/dam/stw/wholesale-charges-/SVT-England-HH-Charges-Scheme-2018_19-v4-Final-Draft.pdf
LGV
Да нашел. Нужно в AnglinWater заглянуть.