Had the same problem, as SAB1 mentioned, I had high manganese and iron in the well water. It passed the water test. The lake has an iron/manganese eating bacteria in it that produces H2S. When I introduced the water to my house system, the bacteria mixed in the water heater and it was so bad, I had to take a shower with a box fan blowing fresh air in.
What I did was changed to an aluminum anode in the water heater, many chlorine flushes. its been fine for years now.
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