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This is a repost of a related question, but I have changed the question. I noticed in late February that even immediately after washing my hair, it felt and looked greasy and that my bath water felt as though it had a bit of bath oil in it. The town water department thought that it might have to do with my water heater.

Before I got around to having it flushed, I noticed that it was leaking from the bottom. I had it replaced on March 17, but the problem persists.

The town tested my water on March 30. The following day they told me that all was normal, except that the hot water was a few points higher in Ph level. The cold water is 7.80, while the hot is 9.96.
The result of the test are below.

I don't know if the higher pH level, iron, manganese or alkalinity has something to do with not being able to rinse the conditioner out, and I am left with an oily residue. If I just shampoo, I don't have the problem. Likewise, if I rinse with cold water only, I don't have the problem.

My house was built in 1947 and has copper pipes. The service lines from the street are cast iron and at least 70 years old. I don't see any sheen or film on the water, but I do feel it--only with the hot water. I don't notice any odor.

Thanks!

Results of water quality test

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  • I made a mistake. The pipes inside the house are copper. – K. Miller Apr 12 '20 at 20:09
  • Do you have a water softener? Is it only on the feed to the hot water supply? That's a common enough arrangement that I ask, and suspect something up with it, given significant chemical differences in the hot & cold water as tested. – Ecnerwal Apr 13 '20 at 0:43
  • The op said no softener in comments to the original question. – Ed Beal Apr 13 '20 at 15:09
  • I'd forgotten to include that. No softener. No treatment. None of the neighbors have noticed anything similar. However one neighbor has noticed that their water is more discolored than normal. It is only the hot water. – K. Miller Apr 13 '20 at 21:06

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