The ownership of the line once it leaves the highway ROW is that of the property owner. The line materials were purchased by my father & the county installed with 'free' chain-gang labor back in the 60's. You get what you pay for......
The line, now that I have dug up a separated joint, is...
There is a 48" storm drain installed in 1960's running 300' through my property draining several hundred acres upstream. Following the last few years drought, these pipes have settled and now sink holes are developing at various points where storm water exits the pipes at the joints...