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Potable water corrosion of copper distribution system

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chemengpro

Chemical
Joined
Nov 26, 2001
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We have a situation where well water is used as a potable water source. Copper analyses (EPA 6010) for copper are consistently ND (below 20 micrograms per liter) at the well head.

There is a copper distribution system between the well head and point of use.

Copper at the drinking water point of use typically contains both dissolved and total copper, 18-20micrograms per liter and 40 micrograms per liter respectively.

What causes the potable water to corrode the copper piping? pH 7.0+/-, DO and other dissolved gases unknown, hardness unknown - probably high.

Is there an index or some other quantifiable parameter that can be used as a control parameter?
 
Off hand, the pH appears low. It would help to nail down the water quality ... carbonates (P & M Alk), hardness, conductivity, temperature...
 
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