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Newsletter Member Needs Help
 

 
Subject - Newsletter Member Needs Help

November 20, 2006  

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Newsletter Member Needs Help

Mike,
In December of 2005 I had two water leaks in my front yard, caused by pin-hole leaks in my copper water line. The leaks in the pipes were from the street to the house, thus the responsibility to repair was left up to me and not to the water supplier. My home is 4 years old and I do not understand why I should have such a problem with a newer home.

I called a plumber to repair the two leaks and from what he says it appears to be either a problem with bad copper piping or electrical current going through the copper pipes. Because I was not the original owner of the home, but the second owner, the builder said they were not responsible to repair the leaks. Remember, this was back in December of 2005. Well, this week my neighbors on both sides of me have encountered the same problem with water leaks. Although they have not had their problems repaired yet, the plumbers that have looked at their leaks do confirm that it is again, either bad pipes or electric current passing through the pipes. I do have a ground wire running from my electrical box and grounded on the inside to the copper water pipe line.

Also I have found out that all the wiring (i.e. phone, cable, gas, electric) is in a tunnel ditch going across the copper water line from the water meter to my house. I live in Kentucky were the building codes permit such utilities to be tunnel placed as such.

Mike Holt Comment: It's my understanding, based on studies by the American Water Works Association (AWWA), that alternating current flow does not create this problem. I'm willing to change my opinion if someone has a study to support the claim that pin hole leaks can be created in metal piping because of current flow. Do you have any thoughts?

 

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Comments
  • I have the same study that Mike Holt mentioned by the AWWA. While AC current will not cause corrosion of metallic water piping DC will. And it can be away from the house or towards the house. If away from the house, it will cause corrosion of the copper piping. If the piping is continuous to the water main in the street, the AWWA (American Water Works Association) recommends installing a 6-12" section of nonmetallic pipe at least 10 feet from the house (so the water service line will still be effective as grounding electrode) DC current can be caused from electric drills or hair dryers. Also, as I do a lot of work for a large municipal water system, and in our system we have a corrosion control treatment facility that raises the pH of the water from 7.5 to 8.5, as the low pH is corrosive to the lead and copper. This is a requirement by the EPA to treat some water if its considered aggressive and can cause corrosion. Check with your water supplier, see what the pH of the water is, and if it changes from season to season. Your answer will depend a lot on how large the supplier is, and hopefully they will have a water quality technican you can discuss this with.

    Tom Baker

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