17 Dec
2003
17 Dec
'03
11:17 p.m.
Water pipes are often form the earth line. If only 60hz (US) can get through the power cables then only 60 hz can get into the water pipes (I'll ignore re-radiating, because water pipes are the least of your problems there).
The high-frequency harmonics from your computers are probably above the cutoff frequency of the water-pipes when considered as circular waveguides. The water filling will act as a dielectric, bringing F0 down. So, it is conceivable that extremely high frequency radiation (>3 Ghz) could propagate well in a water pipe.