On Sunday, December 6, 2020 at 6:40:05 PM UTC, Pamela wrote:
> On 17:55 6 Dec 2020, Mark Goodge said:
> I vaguely recall for shared domestic drains and sewers (I believe
> the term is "private sewer"), the water company sometimes has a
> responsibility. At least that what water company repair men
> told me when they cleared a blockage at my mother's house.
Yes, I think it is generally correct, that the water company is
responsible for the lengths of sewage pipes that serve several
properties, when the water company provides sewage services
to those properties.
However, the OP's post refers to a septic tank, which presumably
is private, and not provided by or serviced by the water company,
as it would be in the case of mains sewage,
The water company cannot really be responsible for maintaining
services which they do not provide.