other day started hearing a low noise like water running in a bathroom. The meter though isn't turning or at least the leak indicator doesn't turn. Using a mechanics stethoscope at the pipes they are noisy like a hissing sound. Something really strange is if I shutoff the valve to the water heater input the noise gets really loud and you can hear it near the wall itself but the meter doesn't show any evidence of water running. My water heater is connected to the pipes with flexible connections which are not metal so the water heater isn't bonded to the pipes. That concerns me as well since we are also seeing purple and sometimes black like stuff coming out of the bath faucets. The water heater is new this year. I'm worried something is happening with the anode and the water heater needs to be electrically bonded to the pipes. Or my copper pipes have all corroded to a point they are just now spitting out this stuff. I have single handle faucets everywhere so the hot and cold lines are electrically connected there. I'm going to take a photo of the water meter and be sure nothing is running anywhere in the house and wait a few hours and take another photo and post the results. Could a pin hole leak make a lot of noise in the lines yet not move the meter or not move it quickly? If I put the stethoscope on the inlet to the water heater it is silent but the outlet from the water heater has the same noise.