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> If I pull water from a well and then put it back in the ground with a septic

Get your septic system fixed if this is happening. Septic systems are supposed to evaporate the water into the air, not put it back into ground water.

Of course you won't actually see it working like that in a properly functioning system. However that is how it should work.

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How do they evaporate into the air? https://www.epa.gov/septic/types-septic-systems "conventional system" is the one I know most common, and I've never seen an evapotranspiration system.

Ah:

>Evapotranspiration systems are only useful in specific environmental conditions. The climate must be arid and have adequate heat and sunlight. These systems work well in shallow soil; however, they are at risk of failure if it rains or snows too much.

So it's a desert thing, I am not in a desert.

I am in the desert, and still haven't heard of this. Everyone out near me has a leach field.

That is what the Leach field does.

Leach fields are not uncommon: https://en.wikipedia.org/wiki/Septic_drain_field

Leach fields evaporate water.

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