Depends. We put a new shower room in the house, and the water was connected from the mains copper pipe under the sink, and brought into the shower room. They used 100% copper pipes.
Same with the upstairs bathroom, 100% copper pipes. That length of copper pipes would be enough earthing to tune up to about 40M bands and above. Not quite 80M though
If in the event of emergency or natural disaster scenario, if your only way getting out another person for help were via wireless comms, and you had an HF rig, then anything to load up as an antenna and works could be life saving means