Pipe ownership question.

[Wingedharpy]

Victorian terraced house.
2 rainwater downpipes collect our roof water and water from roof off canopy, over ground floor bay window at front of house.
Pipes go underground.
Both pipes meet underground, at a Y-shaped junction under front garden (small, postage stamp sized garden) then continue underground, beneath house boundary wall, under street pavement and emerge at the road kerbside where they drain along side of road.
Road is a public highway.

Am I right in thinking that I am responsible for the pipe(s) up to the point where they leave my boundary?
Ie. Water company is responsible for the under the pavement bit and the bit where it emerges at kerbside?
Thank you.

I doubt the water company is involved at all. It's likely to be the council (as highway authority) that is responsible for the bit under the pavement. But I'm guessing. And I'm not sure there is ever a definitive answer without checking original title deeds and local custom.

What's the problem exactly?

Thanks Muriel.
The pipe has broken at the Y joint bit, under my garden and is leaking.
It's been CCTV'd and will be repaired shortly.
The drain men who inspected it, felt that a contributing factor to the joint failure was that the pipe was blocked at the roadside end.
It is also quite badly broken at the kerbside bit, because, being a narrowish street with lots of traffic, cars do sometimes park on the pavement or mount the kerb, temporarily, to give way to oncoming vehicles.
There is a small gap in the kerbstones, to facilitate this pipe's exit and this means the pipe takes the weight of any car that chooses to drive over it.
I think it needs some sort of cover over the kerb gap to stop it getting mangled any more but suspect I can't just dig up the pavement to facilitate this, hence, trying to find out who I need to contact to discuss it with so I don't end up with this hassle again.

Bump

Water companies usually only take responsibility for foul sewers not rainwater goods, and even then its only from the point where the drainage from 2 or more houses meet.

The pipe takes all the rainwater from our house and next door neighbours.

Does it take your waste water from your sinks and toilets?

(I'm an ex water company employee)

Your home insurance usually includes repairs to underground pipes on your property.

Sorry, @MrsMoastyToasty, I'd wandered off.
The pipe(s) in question, take rainwater only, from front of our and our neighbours houses.
All sewage waste drains at back of property, into public sewer (us and same neighbour).

AmandaHoldensLips, our insurance company are involved in the saga.