My well water pH is 7.06 as measured by an accurate and calibrated tool used for wine making. I have around 15 gpg of hardness. My question is why I am getting between .5 - 1.0 mg/L of copper in my water. I measured the copper where the water enters the house and it was 0.0 (no copper pipes outside house). Inside is a different story. It is below the EPA action level of 1.3 mg/L but I'd rather not have any copper corrosion. With a pH of 7 and the hardness level I have would this indicate something wrong besides water chemistry? Electrolysis?

Also, when the water softener was activated the problem was way worse. Bypassing the softener brought the copper levels down. This makes me think it is a water chemistry issue.

  • Did you flush the pipes before measuring the copper? It may just be that the water sat in the pipes for a long time and that's why the copper was so high. Otherwise, it's likely to be electrolysis. – David Schwartz Dec 30 '16 at 21:57
  • I did flush the pipes. They are used often throughout the day. With electrolysis I guess I have to go crawling through the attic looking for metal on metal contact... – 0xb00 Dec 30 '16 at 22:01
  • @user64440 - metal on metal contact on the outside of the pipe is not going to create the problem. It's only an issue with dissimilar metals connected electrically and both in contact with the water. – Mark Dec 30 '16 at 22:28
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    Softeners can cause copper sulfates a third type of pitting in copper pipes. If you can examine the pipe inner wall and it is a nice bright blue color your softener is the likely issue. Try turning it off for a week or so and test again. – spicetraders Dec 30 '16 at 22:45
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    Are you chlorinating in any form? If so, how much and how? – Tyson Dec 31 '16 at 0:15

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