Water – blue water from coper pipes

Hearing a small amount of noise from a water meter vibrating is not uncommon, however if the noise is loud enough to be distracting, you may have a worn impeller in the meter. You can try holding the meter securely or applying some pressure to the meter to see it that reduces the noise, but also you will be able to feel if the vibration is coming from the meter itself. If simply holding the meter or the lines attached reduce the noise to an acceptable level, then securing the pipes to a wall bracket or clamping them securely may be all you need to do. If this test does not lower the noise and you can feel the vibration through the meter housing, then I'd suggest calling your water utility company. They own the meter and would come out to replace it if necessary, usually at no cost to the consumer.

On second review of the photos, I don't think that the corrosion is due to electrolysis. The dielectric nipples should be adequate to prevent that and there is no sign of issues with the hot connection. As for the T&P connection, if the copper drain pipe does not come into contact with anything then there is no closed circuit for electrolysis to take place.

It looks more like corrosion due to a small leak over a long period of time. A leak that would not have always been noticeable, but would slowly get worse over time. You can see where the water has been dripping and there is signs of calcium buildup.

Like I mentioned in a previous comment, I would inspect the sacrificial anode rod and replace it if needed. As for the cold connection, you could:

• cut the copper line and unscrew the copper section from the nipple
• brush the nipple with a steel wire brush to remove the buildup
• reinstall the copper section using teflon tape and a joint compound on the nipple
• reconnect the copper line that you cut with a shark bite coupling or a solder coupling if you know how

You could do the same with the T&P connection, just cut the vertical down pipe so that you can remove the copper pipe from the T&P and then remove the T&P, clean and reinstall.

You mentioned that the tank was installed in 2006, so it would be nearing the end of its life expectancy (most residential warranties are for 5 to 6 years) so I would keep an eye on the tank for any leaks.