What Causes THIS Much Corrosion?

Hey everyone. What in the world causes this much corrosion (copper turning green on its entire surface)? The space is an outdoor-access utility room. The well pressure tank’s galvanized pipe is green like this as well. Anyone have an idea why this happens?

Exposure to chlorine will do it.

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It’s the well water. Have it tested.

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Condensation from the cold well water and of course the water itself.

Copper pipe electrolysis is a copper water main killer.
The steel tank is oxidized. Almost pitted through I suspect.

There are copper pipes, unions, steel tank, as well, electricity for the pump.
Pick you choice.

Thanks guys.