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I thought about doing this but then realized that there is basically zero chance there is copper all the way to my house, so yeah, I gave up.

I actually saw the plumber dig up the mains that ran to my place and it was pex.

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Do you mean from the mains to the water meter or from the water meter to the house? We used copper all the way to the street.

I can’t believe the mains themselves could use PEX: if nothing else the pressure would be too high.

They meant HDPE but assumed it was PEX, which it isn’t. PEX is cross linked polyethylene and used for mostly indoor piping, and HDPE is high density polyethylene. Common mistake.

HDPE is used extensively in all underground utilities, including but not limited to water, sewer, gas, electric, fiber.

Ok but it's plastic, and not cooper ?

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